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 0x3d850ce4a504bb5768fc78e7247b393c53ee801449630ae81540960918e0bf0d. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84e45811-29e2-4e78-851a-2bebfdb05099.json and https://artists.proofprofile.net/proofs/artist/84e45811-29e2-4e78-851a-2bebfdb05099.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in E-Flat Minor: I. Requiem et Kyrie
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 0xd7ec0bdbb9784a17236d91cb016cff23a9394a98aaca9d18f13acc4257856890. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLE422312501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e27c8b2194465ccdd954cfea43c3e9a19001936c69ee26a1bb30724fbdcc33. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLE422312502.
Requiem in E-Flat Minor: III. Tuba mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788ed9b206d3f5043ca359af19d15d05c4a9d8fc65f3761465ae9642cfec14c3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLE422312503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2aed5d9d5a4869c71f91bfb1bb3ed0b0960955707238a3eaee84d984c5a4693. 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/NLE422312504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d500fb9db5c2589aefeb2645a0d04c81422706970622647da1a149f50b4105e. 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/NLE422312505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba3bc9dadd066a3e70c46f21cd39d0ffc3a29ed3e3fdbbdc1da680218790ca5. 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/NLE422312506.
Requiem in E-Flat Minor: VII. Domine Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cb7591121d060d5bfee82b5cf6d68620342a81dbc6def9dd078e61093d0ee0. 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/NLE422312507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb82b5a73b22f254bae2354d041b101482cd17c72b903f6dbeb14636a34e5030. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLE422312508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf537bf98cdb6e9b87ee3ab4f6732585bc3661649692cf56a0f816576725c458d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLE422312509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f924be910ee2544d54b46c29d750d48fa0a6a8411ccecced887b11b1c6552a2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLE422312510.
Requiem in E-Flat Minor: XI. Quia pius es - XII. Requiem aeternam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dfa4e801efed153851e83b702f651dee643186dceb095ab0f003c5b7ed8a15. 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/NLE422312511.