thumb|right|upright=1.4|The apocryphal letter of Sultan Mehmed II to the Pope (), published by Nicolae Iorga. Series 4: 1453–1476, Paris; Bucharest, 1915, pages 126–127 Apocrypha () are biblical or re
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a317f8f63cba4f3536d07ffa86c2007acbc67b5d1ebbd8e01c56379c7abb6b8. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9732da2-18b5-416f-bdc7-224b92b6f3e3.json and https://artists.proofprofile.net/proofs/artist/b9732da2-18b5-416f-bdc7-224b92b6f3e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).