{"system":"GoGuides Change Intelligence","capability_id":"goguides.change_intelligence","api_version":"change-v1","scope":"domain_root_change_intelligence","domain":"4englishapp.com","classification_method":"deterministic_ruleset","classification_version":"change-v1","license":"https://www.goguides.com/data-license","license_version":"2.0","status":"observed","change_state":"changed","public_eligible":true,"tracked_url":"https://4englishapp.com/","tracked_url_scope":"domain_root","root_selection_method":"central_domain_authority_root_precedence_v1","comparison_scope":"consecutive_stored_states_of_same_authoritative_root_url","history":{"observations_loaded":26,"change_events_returned":25,"limit":25,"first_loaded_at":"2026-09-16 14:11:18","last_loaded_at":"2026-10-13 22:40:00"},"current_observation":{"id":17618625,"timestamp_used":"2026-10-13 22:40:00","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-13 22:40:00","last_observed_at":"2026-10-13 22:40:00","observation_count":1},"latest_change":{"previous_observation":{"id":17458104,"timestamp_used":"2026-10-12 23:01:29","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-12 23:01:29","last_observed_at":"2026-10-12 23:01:29","observation_count":1},"current_observation":{"id":17618625,"timestamp_used":"2026-10-13 22:40:00","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-13 22:40:00","last_observed_at":"2026-10-13 22:40:00","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":13,"word_count_delta":37,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8569799298336870066","text_simhash_hex":"76EE0B0E9DC2CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":611,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"9d45d7dbcd84f733c6a4634e4294cf9ba52dc9d042faf3eda0d4e60993677099","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8930156329465990834","text_simhash_hex":"7BEE49DE1E86CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":648,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"859774ec31dcaf0b53aa684c74f693980bf355c065aa57412a5cccf28eaafefe","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},"events":[{"previous_observation":{"id":17458104,"timestamp_used":"2026-10-12 23:01:29","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-12 23:01:29","last_observed_at":"2026-10-12 23:01:29","observation_count":1},"current_observation":{"id":17618625,"timestamp_used":"2026-10-13 22:40:00","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-13 22:40:00","last_observed_at":"2026-10-13 22:40:00","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":13,"word_count_delta":37,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8569799298336870066","text_simhash_hex":"76EE0B0E9DC2CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":611,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"9d45d7dbcd84f733c6a4634e4294cf9ba52dc9d042faf3eda0d4e60993677099","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8930156329465990834","text_simhash_hex":"7BEE49DE1E86CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":648,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"859774ec31dcaf0b53aa684c74f693980bf355c065aa57412a5cccf28eaafefe","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":17293129,"timestamp_used":"2026-10-11 23:37:06","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-11 23:37:06","last_observed_at":"2026-10-11 23:37:06","observation_count":1},"current_observation":{"id":17458104,"timestamp_used":"2026-10-12 23:01:29","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-12 23:01:29","last_observed_at":"2026-10-12 23:01:29","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":9,"word_count_delta":51,"internal_link_count_delta":1,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146328562880925362","text_simhash_hex":"7EEE495E5D86CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":560,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"ffba0892951521603bd7ebdf7de9e881e4a5ca05d3320c71e851539cbaf8e7f9","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8569799298336870066","text_simhash_hex":"76EE0B0E9DC2CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":611,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"9d45d7dbcd84f733c6a4634e4294cf9ba52dc9d042faf3eda0d4e60993677099","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":17135632,"timestamp_used":"2026-10-11 02:30:57","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-11 02:30:57","last_observed_at":"2026-10-11 02:30:57","observation_count":1},"current_observation":{"id":17293129,"timestamp_used":"2026-10-11 23:37:06","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-11 23:37:06","last_observed_at":"2026-10-11 23:37:06","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":7,"word_count_delta":40,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146258399259184818","text_simhash_hex":"7EEE098E1FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":520,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"27095b1c1ca9fed33e172c0b4399376ae5d6880a06b0d3824e7d956715ff2eb4","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146328562880925362","text_simhash_hex":"7EEE495E5D86CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":560,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"ffba0892951521603bd7ebdf7de9e881e4a5ca05d3320c71e851539cbaf8e7f9","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":16971541,"timestamp_used":"2026-10-10 03:35:33","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-10 03:35:33","last_observed_at":"2026-10-10 03:35:33","observation_count":1},"current_observation":{"id":17135632,"timestamp_used":"2026-10-11 02:30:57","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-11 02:30:57","last_observed_at":"2026-10-11 02:30:57","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":8,"word_count_delta":-5,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146257818326945458","text_simhash_hex":"7EEE0906DD844EB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":525,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"1286c600cc552cf7ffea9fbf12a44bd11967597225b7c72a227c9d9409704e41","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146258399259184818","text_simhash_hex":"7EEE098E1FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":520,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"27095b1c1ca9fed33e172c0b4399376ae5d6880a06b0d3824e7d956715ff2eb4","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":16806412,"timestamp_used":"2026-10-09 04:21:29","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-09 04:21:29","last_observed_at":"2026-10-09 04:21:29","observation_count":1},"current_observation":{"id":16971541,"timestamp_used":"2026-10-10 03:35:33","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-10 03:35:33","last_observed_at":"2026-10-10 03:35:33","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":7,"word_count_delta":-21,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146257883863109298","text_simhash_hex":"7EEE09161FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":546,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"3ed93f6907d6ca769187e0c9ffa5325cb06b245ada0d3b7b3172e83a7f453f7e","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146257818326945458","text_simhash_hex":"7EEE0906DD844EB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":525,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"1286c600cc552cf7ffea9fbf12a44bd11967597225b7c72a227c9d9409704e41","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":16636441,"timestamp_used":"2026-10-08 04:54:57","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-08 04:54:57","last_observed_at":"2026-10-08 04:54:57","observation_count":1},"current_observation":{"id":16806412,"timestamp_used":"2026-10-09 04:21:29","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-09 04:21:29","last_observed_at":"2026-10-09 04:21:29","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":4,"word_count_delta":30,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097876451380786","text_simhash_hex":"7AEE49161F86CE32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":516,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"124000f1128b09d308f8e194df1c07a958e6dbc255925d0d9e8eeaa61bd8333c","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146257883863109298","text_simhash_hex":"7EEE09161FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":546,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"3ed93f6907d6ca769187e0c9ffa5325cb06b245ada0d3b7b3172e83a7f453f7e","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":16469104,"timestamp_used":"2026-10-07 05:45:52","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-07 05:45:52","last_observed_at":"2026-10-07 05:45:52","observation_count":1},"current_observation":{"id":16636441,"timestamp_used":"2026-10-08 04:54:57","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-08 04:54:57","last_observed_at":"2026-10-08 04:54:57","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":4,"word_count_delta":63,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027507712446130","text_simhash_hex":"7AEE09161FD6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":453,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"c9ef9510e1b636b6a80e4a6101f40ace016d130bb163f002c5dd0cb5c99161cf","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097876451380786","text_simhash_hex":"7AEE49161F86CE32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":516,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"124000f1128b09d308f8e194df1c07a958e6dbc255925d0d9e8eeaa61bd8333c","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":16297574,"timestamp_used":"2026-10-06 06:45:19","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-06 06:45:19","last_observed_at":"2026-10-06 06:45:19","observation_count":1},"current_observation":{"id":16469104,"timestamp_used":"2026-10-07 05:45:52","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-07 05:45:52","last_observed_at":"2026-10-07 05:45:52","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":3,"word_count_delta":-3,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097877529317042","text_simhash_hex":"7AEE49165FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":456,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"b844951c1499f47b22cddcb6f896ac0351d9a771acd298c4dd11f11141f7fcf9","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027507712446130","text_simhash_hex":"7AEE09161FD6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":453,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"c9ef9510e1b636b6a80e4a6101f40ace016d130bb163f002c5dd0cb5c99161cf","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":16122466,"timestamp_used":"2026-10-05 07:47:12","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-05 07:47:12","last_observed_at":"2026-10-05 07:47:12","observation_count":1},"current_observation":{"id":16297574,"timestamp_used":"2026-10-06 06:45:19","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-06 06:45:19","last_observed_at":"2026-10-06 06:45:19","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":6,"word_count_delta":-27,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027438959414930","text_simhash_hex":"7AEE09061DD6CE92","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":483,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"a23f150be3fa210a279cdc4610264002ef0aebb06dd7114cc077fdb87259a8ea","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097877529317042","text_simhash_hex":"7AEE49165FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":456,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"b844951c1499f47b22cddcb6f896ac0351d9a771acd298c4dd11f11141f7fcf9","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":15941278,"timestamp_used":"2026-10-04 08:50:09","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-04 08:50:09","last_observed_at":"2026-10-04 08:50:09","observation_count":1},"current_observation":{"id":16122466,"timestamp_used":"2026-10-05 07:47:12","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-05 07:47:12","last_observed_at":"2026-10-05 07:47:12","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":5,"word_count_delta":-40,"internal_link_count_delta":-2,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858308984836640434","text_simhash_hex":"7AEF09169FD6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":523,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"4245889d1cead2f135bc7a9565ebaaa7b89d88b989d4ec2a33b8b1b41414ec7f","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027438959414930","text_simhash_hex":"7AEE09061DD6CE92","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":483,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"a23f150be3fa210a279cdc4610264002ef0aebb06dd7114cc077fdb87259a8ea","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":15769375,"timestamp_used":"2026-10-03 09:54:49","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-03 09:54:49","last_observed_at":"2026-10-03 09:54:49","observation_count":1},"current_observation":{"id":15941278,"timestamp_used":"2026-10-04 08:50:09","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-04 08:50:09","last_observed_at":"2026-10-04 08:50:09","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":7,"word_count_delta":-6,"internal_link_count_delta":2,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858379385787698867","text_simhash_hex":"7AEF491E1F84CEB3","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":529,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"3df51c88495a469a234626cdfa1d04f259e277c6420741e7b3afdb857b7c9943","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858308984836640434","text_simhash_hex":"7AEF09169FD6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":523,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"4245889d1cead2f135bc7a9565ebaaa7b89d88b989d4ec2a33b8b1b41414ec7f","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":15593205,"timestamp_used":"2026-10-02 10:50:30","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-02 10:50:30","last_observed_at":"2026-10-02 10:50:30","observation_count":1},"current_observation":{"id":15769375,"timestamp_used":"2026-10-03 09:54:49","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-03 09:54:49","last_observed_at":"2026-10-03 09:54:49","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":5,"word_count_delta":-30,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027542072053426","text_simhash_hex":"7AEE091E1FD4CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":559,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"1055ed1cdbdb9c0fc44941eacdfee08d5973e6213d6d3a7f8a92144c3b502ba7","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858379385787698867","text_simhash_hex":"7AEF491E1F84CEB3","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":529,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"3df51c88495a469a234626cdfa1d04f259e277c6420741e7b3afdb857b7c9943","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":15422648,"timestamp_used":"2026-10-01 11:16:20","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-01 11:16:20","last_observed_at":"2026-10-01 11:16:20","observation_count":1},"current_observation":{"id":15593205,"timestamp_used":"2026-10-02 10:50:30","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-02 10:50:30","last_observed_at":"2026-10-02 10:50:30","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":6,"word_count_delta":79,"internal_link_count_delta":-2,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858313417225064114","text_simhash_hex":"7AEF0D1E9EC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":480,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"d6200502103f3a1e79668408d8023ec6ff5b4ce7a39a9f68cf9f144fa3e58f6e","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027542072053426","text_simhash_hex":"7AEE091E1FD4CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":559,"internal_link_count":31,"external_link_count":0,"outbound_links_sha256":"1055ed1cdbdb9c0fc44941eacdfee08d5973e6213d6d3a7f8a92144c3b502ba7","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":15245999,"timestamp_used":"2026-09-30 11:11:21","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-30 11:11:21","last_observed_at":"2026-09-30 11:11:21","observation_count":1},"current_observation":{"id":15422648,"timestamp_used":"2026-10-01 11:16:20","timestamp_basis":"last_observed_at","first_observed_at":"2026-10-01 11:16:20","last_observed_at":"2026-10-01 11:16:20","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":6,"word_count_delta":2,"internal_link_count_delta":1,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027474425401010","text_simhash_hex":"7AEE090E5FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":478,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"54037cc0cf8bd00fd1e81e5642b6c139b8f2a1956e1aed5ac72f3e1ef78c7efa","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858313417225064114","text_simhash_hex":"7AEF0D1E9EC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":480,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"d6200502103f3a1e79668408d8023ec6ff5b4ce7a39a9f68cf9f144fa3e58f6e","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":15069203,"timestamp_used":"2026-09-29 10:31:49","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-29 10:31:49","last_observed_at":"2026-09-29 10:31:49","observation_count":1},"current_observation":{"id":15245999,"timestamp_used":"2026-09-30 11:11:21","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-30 11:11:21","last_observed_at":"2026-09-30 11:11:21","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":7,"word_count_delta":-5,"internal_link_count_delta":-1,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097912924917426","text_simhash_hex":"7AEE491E9D84CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":483,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"0d762faffbb08d3dff75adadc089387d6481a4313c98623cb53596a2672f6501","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027474425401010","text_simhash_hex":"7AEE090E5FC6CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":478,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"54037cc0cf8bd00fd1e81e5642b6c139b8f2a1956e1aed5ac72f3e1ef78c7efa","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":14868799,"timestamp_used":"2026-09-27 23:21:32","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-27 23:21:32","last_observed_at":"2026-09-27 23:21:32","observation_count":1},"current_observation":{"id":15069203,"timestamp_used":"2026-09-29 10:31:49","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-29 10:31:49","last_observed_at":"2026-09-29 10:31:49","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":9,"word_count_delta":-11,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146539359909371570","text_simhash_hex":"7EEF09165F86DEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":494,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"8b614eb3a7c25c66b79514728d626a2da7c7123c70ccd74517738596e1e1cda1","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097912924917426","text_simhash_hex":"7AEE491E9D84CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":483,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"0d762faffbb08d3dff75adadc089387d6481a4313c98623cb53596a2672f6501","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":14684964,"timestamp_used":"2026-09-26 22:05:27","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-26 22:05:27","last_observed_at":"2026-09-26 22:05:27","observation_count":1},"current_observation":{"id":14868799,"timestamp_used":"2026-09-27 23:21:32","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-27 23:21:32","last_observed_at":"2026-09-27 23:21:32","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":13,"word_count_delta":-49,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027473320955442","text_simhash_hex":"7AEE090E1DF24E32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":543,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"18c5349bc34ff35cde0dae2a021c3e18c0b7f7c180ce631f8882e47a2afcdee4","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146539359909371570","text_simhash_hex":"7EEF09165F86DEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":494,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"8b614eb3a7c25c66b79514728d626a2da7c7123c70ccd74517738596e1e1cda1","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":14500027,"timestamp_used":"2026-09-25 19:02:05","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-25 19:02:05","last_observed_at":"2026-09-25 19:02:05","observation_count":1},"current_observation":{"id":14684964,"timestamp_used":"2026-09-26 22:05:27","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-26 22:05:27","last_observed_at":"2026-09-26 22:05:27","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":10,"word_count_delta":13,"internal_link_count_delta":1,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146611858926784050","text_simhash_hex":"7EEF4B065DB4CE32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":530,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"34c101f9077ed21849aefb409a8a23859af49599f58e3634f7f204f1d3540b21","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027473320955442","text_simhash_hex":"7AEE090E1DF24E32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":543,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"18c5349bc34ff35cde0dae2a021c3e18c0b7f7c180ce631f8882e47a2afcdee4","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":14313535,"timestamp_used":"2026-09-24 18:05:03","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-24 18:05:03","last_observed_at":"2026-09-24 18:05:03","observation_count":1},"current_observation":{"id":14500027,"timestamp_used":"2026-09-25 19:02:05","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-25 19:02:05","last_observed_at":"2026-09-25 19:02:05","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":9,"word_count_delta":15,"internal_link_count_delta":-1,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146328286928883378","text_simhash_hex":"7EEE491E1D80CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":515,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"640071be3eaba467355d673074033f22dcf131f6c416342c7f4afafa3d46b85e","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146611858926784050","text_simhash_hex":"7EEF4B065DB4CE32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":530,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"34c101f9077ed21849aefb409a8a23859af49599f58e3634f7f204f1d3540b21","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":14125375,"timestamp_used":"2026-09-23 16:57:59","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-23 16:57:59","last_observed_at":"2026-09-23 16:57:59","observation_count":1},"current_observation":{"id":14313535,"timestamp_used":"2026-09-24 18:05:03","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-24 18:05:03","last_observed_at":"2026-09-24 18:05:03","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":true,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":3,"word_count_delta":3,"internal_link_count_delta":0,"external_link_count_delta":-1}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146609764053208754","text_simhash_hex":"7EEF491E9D82CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":512,"internal_link_count":33,"external_link_count":1,"outbound_links_sha256":"11026c19171f6fb4453ab9ef8466b48fb9f8a99cf5224658a52c52a3c9346997","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146328286928883378","text_simhash_hex":"7EEE491E1D80CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":515,"internal_link_count":33,"external_link_count":0,"outbound_links_sha256":"640071be3eaba467355d673074033f22dcf131f6c416342c7f4afafa3d46b85e","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":13935357,"timestamp_used":"2026-09-22 15:20:01","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-22 15:20:01","last_observed_at":"2026-09-22 15:20:01","observation_count":1},"current_observation":{"id":14125375,"timestamp_used":"2026-09-23 16:57:59","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-23 16:57:59","last_observed_at":"2026-09-23 16:57:59","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":9,"word_count_delta":15,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027542072837810","text_simhash_hex":"7AEE091E1FE0C6B2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":497,"internal_link_count":33,"external_link_count":1,"outbound_links_sha256":"3bff8e2c701b084d4e8f17d07e5d9bab1bb55a68644328d53419239d4e5d0ad0","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146609764053208754","text_simhash_hex":"7EEF491E9D82CEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":512,"internal_link_count":33,"external_link_count":1,"outbound_links_sha256":"11026c19171f6fb4453ab9ef8466b48fb9f8a99cf5224658a52c52a3c9346997","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":13728337,"timestamp_used":"2026-09-19 23:46:10","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-19 23:46:10","last_observed_at":"2026-09-19 23:46:10","observation_count":1},"current_observation":{"id":13935357,"timestamp_used":"2026-09-22 15:20:01","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-22 15:20:01","last_observed_at":"2026-09-22 15:20:01","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":11,"word_count_delta":-16,"internal_link_count_delta":1,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146328254704443058","text_simhash_hex":"7EEE49169CC6DEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":513,"internal_link_count":32,"external_link_count":1,"outbound_links_sha256":"cd329820d8465ee72ba9a5cbe2b73d33092d9edcd1f16cf41146660d47dc594b","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858027542072837810","text_simhash_hex":"7AEE091E1FE0C6B2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":497,"internal_link_count":33,"external_link_count":1,"outbound_links_sha256":"3bff8e2c701b084d4e8f17d07e5d9bab1bb55a68644328d53419239d4e5d0ad0","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":13539067,"timestamp_used":"2026-09-18 22:50:02","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-18 22:50:02","last_observed_at":"2026-09-18 22:50:02","observation_count":1},"current_observation":{"id":13728337,"timestamp_used":"2026-09-19 23:46:10","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-19 23:46:10","last_observed_at":"2026-09-19 23:46:10","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":true,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":8,"word_count_delta":-8,"internal_link_count_delta":2,"external_link_count_delta":-1}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097910782680634","text_simhash_hex":"7AEE491E1DD4DE3A","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":521,"internal_link_count":30,"external_link_count":2,"outbound_links_sha256":"673f150a538ee6388dc4077a9f2a8e1978f3135835ac0fd9f2632c563f1c9ded","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"9146328254704443058","text_simhash_hex":"7EEE49169CC6DEB2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":513,"internal_link_count":32,"external_link_count":1,"outbound_links_sha256":"cd329820d8465ee72ba9a5cbe2b73d33092d9edcd1f16cf41146660d47dc594b","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":13354221,"timestamp_used":"2026-09-17 21:32:28","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-17 21:32:28","last_observed_at":"2026-09-17 21:32:28","observation_count":1},"current_observation":{"id":13539067,"timestamp_used":"2026-09-18 22:50:02","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-18 22:50:02","last_observed_at":"2026-09-18 22:50:02","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":false,"external_link_count_changed":false,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":7,"word_count_delta":-4,"internal_link_count_delta":0,"external_link_count_delta":0}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8569797062807572018","text_simhash_hex":"76EE09061DD4CE32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":525,"internal_link_count":30,"external_link_count":2,"outbound_links_sha256":"5f27c9809c54ab6012e3b51678a78740b2f196bcc417ce981a2a03237a012a8c","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858097910782680634","text_simhash_hex":"7AEE491E1DD4DE3A","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":521,"internal_link_count":30,"external_link_count":2,"outbound_links_sha256":"673f150a538ee6388dc4077a9f2a8e1978f3135835ac0fd9f2632c563f1c9ded","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"},{"previous_observation":{"id":13163647,"timestamp_used":"2026-09-16 14:11:18","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-16 14:11:18","last_observed_at":"2026-09-16 14:11:18","observation_count":1},"current_observation":{"id":13354221,"timestamp_used":"2026-09-17 21:32:28","timestamp_basis":"last_observed_at","first_observed_at":"2026-09-17 21:32:28","last_observed_at":"2026-09-17 21:32:28","observation_count":1},"state":"changed","observation_gap":{"detected":false,"reason":null},"change":{"detected":true,"flags":{"text_changed":true,"structured_data_changed":false,"schema_type_mask_changed":false,"headers_changed":false,"word_count_changed":true,"internal_link_count_changed":true,"external_link_count_changed":true,"outbound_links_changed":true,"ai_policy_mask_changed":false,"canonical_url_changed":false,"final_url_changed":false,"http_status_changed":false,"publisher_declaration_changed":null},"magnitude":{"text_simhash_hamming_distance":10,"word_count_delta":4,"internal_link_count_delta":-2,"external_link_count_delta":2}},"before":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8858379385761220274","text_simhash_hex":"7AEF491E1DF0C6B2","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":521,"internal_link_count":32,"external_link_count":0,"outbound_links_sha256":"12c38eb73a2c62f148d74a389b10f03a764baac19b1ce04a74eab361e465dab2","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"after":{"requested_url":"https://4englishapp.com/","final_url":"https://4englishapp.com/vi","canonical_url":"https://4englishapp.com/vi","http_status":200,"text_simhash":"8569797062807572018","text_simhash_hex":"76EE09061DD4CE32","structured_data_sha256":"469fb4ef837c6a38ae119b15f5f84936c0b006c09bfbf83b743c85db38f3675d","schema_type_mask":"4096","headers_sha256":"7050a5e2d5c1ac88f4d7212effc5d8a9960473faa1aa75fd3d8062238c09eed0","word_count":525,"internal_link_count":30,"external_link_count":2,"outbound_links_sha256":"5f27c9809c54ab6012e3b51678a78740b2f196bcc417ce981a2a03237a012a8c","ai_policy_mask":"1","publisher_declaration_fingerprint":null},"compatibility":{"refresh_recommended":true,"refresh_reason":["text_changed","outbound_links_changed"]},"classification_method":"deterministic_ruleset","classification_version":"change-v1"}],"semantics":{"state_changed":"At least one deterministic stored field changed and the compared observation windows do not overlap.","state_unchanged":"No available deterministic compared field changed and the compared observation windows do not overlap.","state_unknown":"No deterministic comparison can be established from the available stored fields.","state_insufficient_history":"Fewer than two distinct stored root-state rows are available for a comparison pair.","state_observation_gap":"Stored state windows overlap or recur, so chronological adjacency cannot be proved even though mechanical field measurements are still returned.","text_simhash_hamming_distance":"Mechanical 64-bit Hamming distance between stored text simhash values; 0 through 64.","count_delta":"Current stored numeric count minus previous stored numeric count.","hash_change":"Equality/difference only; no unsupported distance metric is invented for cryptographic hashes.","publisher_declaration_changed":"Compared only when explicitly named declaration/self-claim data exists in stored evidence_json; otherwise null.","materiality":"No major/minor/material rewrite label is assigned by change-v1."},"links":{"self":"https://www.goguides.com/changes/4englishapp.com","state":"https://www.goguides.com/state/4englishapp.com","evaluate":"https://www.goguides.com/evaluate/4englishapp.com","history":"https://www.goguides.com/history/4englishapp.com"},"ts_utc":"2026-10-14T16:34:21Z"}