"Blessed Assurance" is a well-known Christian hymn. The lyrics were written in 1873 by blind hymn writer Fanny Crosby to the music written in 1873 by Phoebe Knapp. History Crosby was visiting her fri
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7177861bbb45206e4fb4a184ccb9409a497059bbaaf066e3dafe2e7427a406e1. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec9ecb5b-a4db-4077-a15b-ca51b1c2e381.json and https://artists.proofprofile.net/proofs/artist/ec9ecb5b-a4db-4077-a15b-ca51b1c2e381.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.