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 0xa9adf8f3b7483fc128dfc59a9887d6bb5c30e4c94a08be3d5fd8026008c59055. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c37d1fbd-e0e4-4b7d-9819-92093012f190.json and https://artists.proofprofile.net/proofs/artist/c37d1fbd-e0e4-4b7d-9819-92093012f190.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Petite messe solennelle: V. Gloria. Et in terra pax hominibus
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 0x5376345cc92f9e526654de54aadcb83559579ed635373a4a88fbca2ed0addf1c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR46Y2149405 — a six-check JSON result.
Petite messe solennelle: VI. Gloria. Gratias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770f5d91adb21d6f5319cd6a84ce0f5a44c0a67c2f7f0124ac369eb04936dc4c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR46Y2149406 — a six-check JSON result.
Petite messe solennelle: VII. Gloria. Domine Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4192ac7409ff070e4746132f53e618403bd623cdab154076967a58a1f5e92b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y2149407 — a six-check JSON result.
Petite messe solennelle: XI. Credo. Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f3c5e6c21d1da6db7a57b814fa7fd87f479b79482f8c15b75d68f35f35b7eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y2149411 — a six-check JSON result.
Petite messe solennelle: XIII. Credo. Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffecf596f623286f23ac41d96593c4661fede3c82d9144f254a896e1b02e969. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y2149413 — a six-check JSON result.
Petite messe solennelle: XIV. Credo. Et vitam venturi sæculi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedab02ad28b9d205126cd602f03b4aec050e3dc3004abfb33f82f40a9aa38d66. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y2149414 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e74ae454271d52e57f0c8fe15c9a5e0f5907580e3bb0f39c0afa50548f53bb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y2149416 — a six-check JSON result.