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 0x5cb0e482aa604caf1f60fa17507c6f3fc0f1301c1401c16ffdae259646cce73b. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12d72ccd-cb71-4e54-991e-27e93e549c3f.json and https://artists.proofprofile.net/proofs/artist/12d72ccd-cb71-4e54-991e-27e93e549c3f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musica quinque vocum (Attrib. to Leonora d'Este): Tribulationes civitatum audivimus [from the Musica quinque vocum motteta materna lingua vocata] (attrib. to Leonora d'Este)
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 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 0x6ebb332f87f6bd77f5f36943f088f9c280a3d176ab657dc7ea9c0e7ce4cd0403. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBCJG1402200.
Musica quinque vocum (Attrib. to Leonora d'Este): Haec dies (from the Musica quinque vocum motteta materna lingua vocata) (attrib. to Leonora d'Este)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93c985d5d753819c1023047b41bfb1a783bf0db70247982c4dfd18f5a9609e3. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBCJG1402202.
Musica quinque vocum (Attrib. to Leonora d'Este): Felix namque es sacra (from the Musica quinque vocum motteta materna lingua vocata) (attrib. to Leonora d'Este)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14f8483fdcde7e980177d9d593fbb6179972a721be4843b294c4dff31a80a87. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBCJG1402211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba67c5943cce772a56a7a12bc4e02e98104be2527c8a0105317325712d9271a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBBDZ0925598.
Motets for 5-8 Voices, Book 3 for 5, 6 and 8 Voices: Surge illuminare Jerusalem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd581909ac7c7dddb1909de050dcdd0c6bbb91d64a28601de5cada9acb07e2f28. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBBDZ0925599.
Amo Christum, In Cuius Thalamum Introivi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd95f53031262d153dadcf16af8f2eb1e25ed6b790169d7dfb4efef2b810c31. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBBDZ0925601.
Masses, Book 9, Missa Veni Sponsa Christi: Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeade8abca527b0a0eaf3cc70e3526b51ad0d92a815de1e8bfe89419e7024330e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBBDZ0925603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a57c98c8d084fac8fad813ba3072de95983f2345a9c3b56662fb7bf8e79dda. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBBDZ0925608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaeddc7de7ec848c73ac60b1e032926b313751811533e70d78c05ebb2db5e201. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBBDZ0925611.