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 0x518da31366417c0a0b407bb1043792f2159c5b2429a18f1c545d4952d9aba1c8. 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/ffe969f6-00f4-4845-92fc-afa076149bec.json and https://artists.proofprofile.net/proofs/artist/ffe969f6-00f4-4845-92fc-afa076149bec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
fostermusic Best Collection 1 - ROMEO and JULIET
fostermusic Best Collection 2 - SWAN LAKE
fostermusic Best Collection 3 - The last letter from Murdoch / Ma Mere L'oye
fostermusic Best Collection 6 - Prayer of the innocence