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 0xee1c4a8664328b30b8bfa9d0a7c97090633f2052634c3d209b5b70cb219a74d7. Chain 2 (Bitcoin): anchored in block 954047 (2026-06-17T04:56:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/413739be-7886-4348-8ec6-5c8a0f65b12a.json and https://artists.proofprofile.net/proofs/artist/413739be-7886-4348-8ec6-5c8a0f65b12a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).