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 0x28dc4bcfeb6d9fbee16643846de5ac3227173dcd4db05152511cc94c9964b50c. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01b9f647-5d74-411e-8874-2ce8dad30e85.json and https://artists.proofprofile.net/proofs/artist/01b9f647-5d74-411e-8874-2ce8dad30e85.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem en ré mineur, K. 626, Introitus: Requiem
Mozart: Requiem in D Minor, K. 626 (Completed by R. Levin) [Live]
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 0x343ee3e677013d84b1fde8ec2c4e133c5701d08bd1264d5d892cc70eae95a3f9. 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/CAJ721572201.
Requiem en ré mineur, K. 626, Introitus: Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e9f60cf8b8d42bbe8499133e38447323578c3a7efcf991f8dea8a230e3f2b0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CAJ721572202.
Requiem en ré mineur, K. 626, Sequenz: Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094db3f14b1ed5a6605127a83ff7c932ad215fdadf4e9eaab63861550a40ceb5. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CAJ721572203.
Requiem en ré mineur, K. 626, Sequenz: Tuba mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae68f070d42ae41a63f42efd68651b4010dbfdacda4816ed7045ad112fca0231. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/CAJ721572204.
Requiem en ré mineur, K. 626, Sequenz: Rex trernendae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0819205cad08b44a97fbdd53e77e1c22770eaab18743035e57c44fb5fd88f818. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CAJ721572205.
Requiem en ré mineur, K. 626, Sequenz: Confutatis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bf77d3994a68b71e4cff26385d653a0268c478ea92adb419832f8febc53d1f. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CAJ721572207.
Requiem en ré mineur, K. 626, Sequenz: Lacrimosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872bbdaedda1aa3f5b1530911b4c3068c84208703d6f5958abd39de5075f7467. 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/CAJ721572208.
Requiem en ré mineur, K. 626, Sequenz: Amen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabc612f9b53606d162c9b8a7f613e765418addd13f2254b745cebd1e311cda9. 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/CAJ721572209.
Requiem en ré mineur, K. 626, Offertorium: Domine Jesu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81464f6a30948d2e45a8a0396744c0611cfdd3294b979f98418f288ce15a80b9. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/CAJ721572210.
Requiem en ré mineur, K. 626, Offertorium: Hostias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506ce7ec7af0032109dfa1eba431af1b5a4c244062881bab9db3a75425eefcd0. 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/CAJ721572211.
Requiem en ré mineur, K. 626, Sanctus: Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd656beeb24b082449ed09babf61ed2edcfe9ec09aa1623d7bc51639c0585d7a. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CAJ721572212.
Requiem en ré mineur, K. 626, Sanctus: Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22deffc24455f97860f42ba39c0b17aea5c6c2f22be56c9266c886e94319e59. 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/CAJ721572213.
Requiem en ré mineur, K. 626, Agnus dei: Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0606bfc73a8428ce0e8b1f017809ec44092f9e80e452cf06e9e0cf535a2b0d33. 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/CAJ721572214.
Requiem en ré mineur, K. 626, Communio: Lux aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115e0661c3298809263349ae235c6ceecea4c62fcb88be77f03e502a6a329c21. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CAJ721572215.
Requiem en ré mineur, K. 626, Communio: Cum sanctis tuis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc82e4c86ee06f7aeed36f226674ecf785a04812c22fb9ea5d65310526dab46. 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/CAJ721572216.