{"statement_id":"st_eb83b4f2324af1eab106","subject":{"kind":"product","slug":"macbook-air-13","name":"MacBook Air 13-inch","url":"https://sourcetier.com/products/macbook-air-13"},"attribute":{"key":"weight_lb","label":"Weight","unit":"lb","core":true},"scope":null,"region":null,"first_recorded_at":"2026-09-01T23:17:59.941Z","current":{"claim_id":"8c819e7c-ebc4-47ec-b7b6-275ced12584c","value":2.7,"unit":"lb","verification_state":"verified","confidence_recorded":90,"observed_on":"2026-09-01","recorded_at":"2026-09-01T23:17:59.941Z","ended_at":null,"ended_by":null,"superseded_by_claim_id":null,"withdrawal_reason":null,"valid_from":null,"extraction":"muster:(?<![\\d.])(\\d{1,2}\\.\\d)(?![\\d])\\s*pounds","reader":"text pattern","parser_version":null,"method":null,"excerpt":null,"sources":[{"url":"https://www.apple.com/macbook-air/specs/","tier":1,"type":"technical_specification","retrieved_on":"2026-09-01","role":"evidence"},{"url":"https://www.apple.com/macbook-air/specs/","tier":1,"type":"technical_specification","retrieved_on":"2026-09-02","role":"evidence"},{"url":"https://www.apple.com/macbook-air/specs/","tier":1,"type":"technical_specification","retrieved_on":"2026-10-03","role":"evidence"}]},"version_count":1,"versions":[{"claim_id":"8c819e7c-ebc4-47ec-b7b6-275ced12584c","value":2.7,"unit":"lb","verification_state":"verified","confidence_recorded":90,"observed_on":"2026-09-01","recorded_at":"2026-09-01T23:17:59.941Z","ended_at":null,"ended_by":null,"superseded_by_claim_id":null,"withdrawal_reason":null,"valid_from":null,"extraction":"muster:(?<![\\d.])(\\d{1,2}\\.\\d)(?![\\d])\\s*pounds","reader":"text pattern","parser_version":null,"method":null,"excerpt":null,"sources":[{"url":"https://www.apple.com/macbook-air/specs/","tier":1,"type":"technical_specification","retrieved_on":"2026-09-01","role":"evidence"},{"url":"https://www.apple.com/macbook-air/specs/","tier":1,"type":"technical_specification","retrieved_on":"2026-09-02","role":"evidence"},{"url":"https://www.apple.com/macbook-air/specs/","tier":1,"type":"technical_specification","retrieved_on":"2026-10-03","role":"evidence"}]}],"changes":[{"id":"3","type":"documented","label":"First documented","material":true,"sentence":"MacBook Air 13-inch: Weight documented as 2.7 (verified). A first finding of ours, not a change at the vendor.","noticed_at":"2026-09-01T23:17:59.941Z","subject":{"kind":"product","slug":"macbook-air-13","name":"MacBook Air 13-inch"},"before":null,"after":{"value":2.7,"verification_state":"verified","confidence":90},"claim_id":"8c819e7c-ebc4-47ec-b7b6-275ced12584c","statement_id":"st_eb83b4f2324af1eab106","corrected":null}],"page_url":"https://sourcetier.com/statements/st_eb83b4f2324af1eab106","contract":"A statement is the question a claim answers: one subject, one attribute, one scope and region. statement_id stays the same when a new value supersedes the old one, when we withdraw it and when two duplicate entities are merged (the old id then redirects). claim_id identifies one version. versions lists every version oldest first; ended_by is superseded, withdrawn or null for the current one. confidence_recorded is the confidence stored when that version was written, not a recomputation. unknown describes our research, never the product."}