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 0xd237b3521ebfe651b80005ff82457c688d8f81e793845b6aadcbafcc1369ae48. Chain 2 (Bitcoin): anchored in block 953875 (2026-06-16T02:12:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/086060f1-8b72-4d12-9fec-f853138dd36c.json and https://artists.proofprofile.net/proofs/artist/086060f1-8b72-4d12-9fec-f853138dd36c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Tractus para Missa dos Pré-santificados: I. Domine, audivi
Manoel Dias de Oliveira: Sacred Music from 18th Century Brasil, Vol. II
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 0xf759996d4c162dda0bd220f1dd651ce56a094a2bf63476818856b399b34ff060. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611199 — a six-check JSON result.
Tractus para Missa dos Pré-santificados: II. Eripe me, Domine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bbd4f2262cc72184fbf0bb447c3a958944670aa6847e3f52015d70f062fb07. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611200 — a six-check JSON result.
Te Deum laudamus: V. Te Prophetarum - Te Martirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975304e119c09ad721a0b622e46a64ee58a149639958b218c21003f8198db616. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611205 — a six-check JSON result.
Encomendação das Almas: III. Senhor Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6afaeb87f7fe9b36aad36b4bf24f2ec6abb0e2ca698d9b3dea40737baaac47. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611217 — a six-check JSON result.