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 0xd42b101cf62c35d68651fb064f7d22c3fadd4021ee788860dc4ab50ee55d2904. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a842eed-54f5-4dc8-b017-3228be452818.json and https://artists.proofprofile.net/proofs/artist/6a842eed-54f5-4dc8-b017-3228be452818.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x6de04325f60157ce3ece189a43739b518efac7ecc5b1693ded647eab28791ea2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR9P21400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd622cb4e85e35857b4182bb06dd6e7ba02417cea725f60976b5d4176905dac0. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCACW1762109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844ca62491668ec27d12ab62fc84606f0c3a1f0f788aa289acb06aa006818a48. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FR10S1871341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699f396998d0c44244fc440c1d679f69d3a75e8d5da2245609a37c8a7e40035f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR2X41879483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d70b4d7e146618639a59d14d7f7b037e034901133331af1f0651d10ac0ac85. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR2X41879484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddbde462e076afdc25705fd0243f1e2c637e35dc5300bf3456ce8e01bf3582f. 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/FR2X41879485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c85807417cb3f3cfea1771a3cd324afca7854ef2a4ab0071cdb26e55888d0eb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR2X41879486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dff4337aab0a1295bd57c657b83916e6f86f9d94c97b771b353969ea49c7f76. 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/FR2X41879488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0e83852236266b01ec562866d92f53feaf9c00ba60bb603eabced5c1e6ba59. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR2X41879489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425d612b61c8d2bb2143bef9bd1b215d2cc9fc810cade8bc9aebde70ac802f6f. 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/FR2X41879490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef18efda3ac28d86e9203e2c831986842b52326ee8abda6c5961a1261a83ea5. 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/FR2X41879491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a88e6c024909bcd71d8b1fb645d400e3ca30db0fa412a6bf83cd273a3be3ad. 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/FR2X41879492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c6fe40960259393c6deb013473189d1712fa5858b5ba36b4d4a63607a5d32e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR2X41879493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3ed1c302776ea7cdc8e8d4114ae30f21f45e8da66b1c497fc56d67f666e773. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/FR2X41879494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874fe73871c495f48313bb0ccccd2a259bdf361bbf861f15d01ad4c690b55bbe. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/FRX201818639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0a07cd5da0e509d7ebbca81a37156ed3dee6dc3e5b435dfbe27c7f825e22dc. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAEY2049850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02e15133c978b0a487fda8fae0e2c2291ea571a79f9ca1362d7c220a3736686. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAFU2194515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ffccf60b75980e7f9876241b5397a228c7d6489822398b8ec8ac60ff2d0697. 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/FR82S2400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda062388363f71d45303170415f7b820316e5096e212f1cbb9256f65bd64e492. 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/CH6541873253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085566b5118906c872c0893e1cf8210add44d935c666f9b96fc41f4a5c8bd2d1. 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/DGA0M2303619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf421a9e910ee0a33356c63abea1766ba3d73f4aba707a26b013962d8bf7d17b6. 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/FRX872101905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0272ba43002e4181e7f3f76bd9c7308aed0845b15871ff3b163b64007549e09. 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/FRPI81702570.