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 0x4b36d30703d3fe1d630f242b4ad1af26cd021bb34df4bca07ed0449ec3c09bd4. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/067e5084-103f-4d85-a00d-7e0b2ebbb0e9.json and https://artists.proofprofile.net/proofs/artist/067e5084-103f-4d85-a00d-7e0b2ebbb0e9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
These Songs Don't Belong Together, Vol. 1
These Songs Don't Belong Together, Vol. 2
These Songs Don't Belong Together, Vol. 3