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 0x5e6fdadd060d1abd0330bdda4339f62b0843ec7010583e6532bb309d88609adc. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fff5d014-8bce-4ca4-bae0-fc174e74a618.json and https://artists.proofprofile.net/proofs/artist/fff5d014-8bce-4ca4-bae0-fc174e74a618.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
II. Der Himmel Lacht! Die Erde Jubilieret BWV 31, 1. Sonata
Holland Boys Choir, Netherlands Bach Collegium
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 0xa64ed1cea98d4f3dddb9cb5508533992aec7695bb21a979fbeda1e49470b5d94. 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/NLN580537704.
II. Wir Danken Dir, Gott, Wir Danken Dir BWV 29, 1. Sinfonia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed8e9c4c46317bae25a278ef33018a92aece78c8849a6e86ec1ee308097a312. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLN580537726.
II. Wir Danken Dir, Gott, Wir Danken Dir BWV 29, 2. Coro: Wir Danken Dir, Gott, Wir Danken Dir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243779abfd403fc1d591fa947b7dad33cef2f06099b4004f265aa1e748dbca91. 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/NLN580537727.
III. Gott, Man Lobet Dich In Der Stille BWV 120, 1. Aria (Alto): Gott, Man Lobet Dich In Der Stille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3c36349ce0f3844ed4d8a2e40851bed058a7f3c3541bc930566d8f35dd4a1c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580537734.