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 0xfd4de2ff2e5949c29e4e72c8fab0a18659b928b5196af478cf8fcb3fd0a970c8. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3db56862-bb05-4b09-ba31-53608202b8a5.json and https://artists.proofprofile.net/proofs/artist/3db56862-bb05-4b09-ba31-53608202b8a5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Step in Time with the Music of Burt Bacharach
Step in Time with the Music of Ray Charles
Step in Time with the Music of Stevie Wonder
Step in Time with the Music of Nat King Cole & Frank Sinatra
Dancing around the Flowers with Joe Bourne and the S.I.T. Orchestra and Singers