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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888d3e6f6f570eba0a8fb28cef01014a36c2f549a0bf7736b9556123848ee122. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d02e9e7e-0a34-4d43-a597-2a36a610d057.json and https://artists.proofprofile.net/proofs/artist/d02e9e7e-0a34-4d43-a597-2a36a610d057.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ibert: Trois pièces brèves; Janáček: Mládi; Hindermith: Kleine Kammermusik, Op. 24, No. 2; Ligeti: Ten Pieces for Wind Quintet (New Vienna Octet; Vienna Wind Soloists — Complete Decca Recordings Vol. 10)
Danzi: Wind Quintet, Op. 56, No. 1; Cambini: Quintet No. 3; Reicha: Wind Quintet, Op. 91, No. 9 (New Vienna Octet; Vienna Wind Soloists — Complete Decca Recordings Vol. 11)
Taffanel: Wind Quintet; Françaix: Wind Quintet (New Vienna Octet; Vienna Wind Soloists — Complete Decca Recordings Vol. 12)
Mozart; Haydn; Beethoven - Music for a Musical Clock (New Vienna Octet; Vienna Wind Soloists — Complete Decca Recordings Vol. 13)
Mozart: Serenade, K. 375; Serenade, K. 388 'Nacht Musik'; Beethoven: Octet, Op. 103 (New Vienna Octet; Vienna Wind Soloists — Complete Decca Recordings Vol. 15)
Quintet for Piano & Winds in E-Flat Major, K. 452: III. Rondo. Allegro moderato
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb018f122518d42effc35e8dee6a29a4739bbbbedf544cd1a4116cf6e1b968755. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10303114.