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 0x60a410d2b8b02184c5bd1ba7a3b62fce2e654fd79021747a1c5c4984f56b562b. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/280398b0-12df-4d21-8908-f5b0ef1058bb.json and https://artists.proofprofile.net/proofs/artist/280398b0-12df-4d21-8908-f5b0ef1058bb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Jerusalem Y Stella, I.: Mass A 8 / Magnificat for 2 Voices / Delgado, F.: Te Deum Al Sr. Felipe De Jesus (Baroque Mexico, Vol. 1)
Jerusalem Y Stella, I.: Te Deum / Gorgeos Trinando / Rompa La Esfera / Sube A Gozar Senora (Baroque Mexico, Vol. 2)
Al Combate: Rediscovered Galant Music from Eighteenth-Century Mexico