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 0x96c1b2cb1ed9bd4e0fd2aec655088d923d71efd12dedd928f5b88e0c82b56ee1. 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/4b0ace65-1edd-4429-a994-e7f48874365b.json and https://artists.proofprofile.net/proofs/artist/4b0ace65-1edd-4429-a994-e7f48874365b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kyrie, Sanctus & Agnus Dei, ZWV 26: Ib. Christe eleison
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 0x63d7307cb8bc21329bfa58bb9f385d6b54ab16ef5e44bdd03ff51914302ce6e6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP61910002.
Missa Divi Xaverii, ZWV 12: Kyrie eleison II
Zelenka: Missa Divi Xaverii, ZWV 12 & Litaniae de Sancto Xaverio, ZWV 156
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04c8e01a0db1c37bd332c0b6e5c47d1ee0379638e57fe290f4102daa47c5c9f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP61409003.
Litaniae de Sancto Xaverio, ZWV 156: Tuba resonans
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84ea3ace5403c0abdae6ead7d427b88fa025dc76a54bf653b385dc1f794fe71. 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/DECP61409022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59ebc2cf48db4cd3555e433e944a6d45ac4519027dd4924b2caaf93fbfd9750. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER181538304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20cb027c39edfe1ff9025a0dc8c0e27bfa16f0e0af8bdd834df954a3173480a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER181538313.