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 0xa64973a90a178a6265c597d5817ef18a6c4d894fd35ffb5d7b9c5652f9a522d1. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9eb2972c-d461-43ed-9d9c-c01a30a5ce80.json and https://artists.proofprofile.net/proofs/artist/9eb2972c-d461-43ed-9d9c-c01a30a5ce80.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Open Call West Coast (Beats stream edits)
Open Call West Coast Two (Intrumental Stream edit)
Open Call West Coast Three (Instrumental Stream edit)
Open Call West Coast Four (Instrumental Stream edit)