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 0x342655c0657589d05e1a380e075e878656a5da523aa39aa6500cafb1ea399702. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8104d6b8-daa4-4b31-828a-812f6899c026.json and https://artists.proofprofile.net/proofs/artist/8104d6b8-daa4-4b31-828a-812f6899c026.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 0x14992df676ca055f7aa025ac72e3e4bd3560d679c053d66deb35b32aa7cbf947. 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/PLC062240228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3848c4f1bf3db86f1176f927bffffb98951cb4ba57d9b4314c35c924911b6ce9. 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/PLC062372064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423e27999795841cd658b9d4e6322048c2121e592c51a873f70b1b0c76a257d2. 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/PLC062427777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8582648eeb7f4871f4748a939377e97fe48d771fc5a7c93495ca869b7fc7db8. 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/PLC062402913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8d8f0c9e91f6b1ddb7df236ac06f28dd9a0a961a80e2f2dde96d9f3fd1f2ec. 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/PLC062401102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63725542d17ce89da7cee396f01c49ccd528fc4baa1259acecef33193179cb19. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLC062396018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1f9cf748a1ae32af8b7698a41197d35ec945606d0b739d9efebf34f380e80d. 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/PLC062390119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42647cd7069cfcfee464460c542c482809c7a2d3423162cf2b06d4f8d04fa102. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLC062390018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3848c4f1bf3db86f1176f927bffffb98951cb4ba57d9b4314c35c924911b6ce9. 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/PLC062372064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122c8131da245430c0093702334856be09ec25f2d8c5162f056f7fcbbd5e8c6b. 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/PLC062236712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46652f31245c0bc82e7718ea10db0de88da63d5456c7deee166dd722de6b3e7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/PLC062386889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806a7cfe4625110ffdd523879f21e04088daf5bdec3a682bb732c34f4c4210c1. 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/PLC062414782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e0d2c620ea0b561d40f42e0cab4045c973d0b20b918efefee74fa2df1781e5. 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/PLC062414783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb43f82d16f5e1079e8d0c929016cfd3957b3573b86cfd76cc701ed2b19720b2. 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/PLC062414784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a555da91261979d3ed399908a27fca8a812eeb8b4aab08c5142c5140bb777a7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/PLC062402036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63725542d17ce89da7cee396f01c49ccd528fc4baa1259acecef33193179cb19. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLC062396018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42647cd7069cfcfee464460c542c482809c7a2d3423162cf2b06d4f8d04fa102. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLC062390018.