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 0x10676f97b276d58bfbafea08fa158165c5185ded38a02645ed33505e545735e5. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ff259ff-be9f-40ab-9fc7-89d6ba778f58.json and https://artists.proofprofile.net/proofs/artist/4ff259ff-be9f-40ab-9fc7-89d6ba778f58.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Confitebor tibi Domine, ZWV 71: I. Confitebor
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 0x0fb3ab406c66124bc6b7d826aea6c17b70ca1db9d30888b57927d5c14465395b. 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/CZA162500180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921e1b779ab99f6a93e90400fa68e9b0b146eec30d1e48441235d96a58450277. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CZA162500183.
Salve Regina, ZWV 139: II. Ad te clamamus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e590177e57654ccb3e29bbf9a641cfd8358e295793bef57ab6eb0d3375ba885. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CZA162500184.
Lamentation I for Holy Wednesday, ZWV 53
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de76a273f78226a57029460644b75a7a4ba6ebb838009d025f9e5100764a973. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:14Z), 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/CZA162500174.
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
Kyrie, Sanctus & Agnus Dei, ZWV 26: Ib. Christe eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d7307cb8bc21329bfa58bb9f385d6b54ab16ef5e44bdd03ff51914302ce6e6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DECP61910002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02861a864a53bad7ef2f541a3ab8dfb0c0eb737a075fb858056ed0b3128939b3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DECP61910020.
Zelenka: Confitebor tibi Domine, ZWV 71: I. Confitebor
Zelenka: Confitebor tibi Domine, ZWV 71 – I. Confitebor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb3ab406c66124bc6b7d826aea6c17b70ca1db9d30888b57927d5c14465395b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CZA162500180.
Gloria, ZWV 30: VI. Quoniam tu solus Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cffc2ba6435bf50e1fbd57e31a79218fbad045ce8a6bbf4729932ed51f0ad1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/DECP61910009.