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 0xa1980e01e1aa789c54b70602a6233285dd6460284ef00700e44709796ee76169. 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/28d953b8-2cd7-447d-8df2-089e1d9ee82f.json and https://artists.proofprofile.net/proofs/artist/28d953b8-2cd7-447d-8df2-089e1d9ee82f.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 0xcdf83d323edafd3ada3fa2f583d996a9bec3431ecb285b291704b91095f5c0f3. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/BRSIC0900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb54419806efb9cf513e998d72d0a5da294a5b57adbfcb20754560da92afce45. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BRSIC0900054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65643ed7cc5390636e0dcb372e30a00f5f0ebe29b7e41b5c366a632c62a5b911. 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/BRSIC1400268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1283593ac5d9c16b98f9e06fc4981fb05b7c2917d5348810f37ec8972534ed. 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/BRSIC1400272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdfb5df3439f464628a4ace3480440c8e83c23ec8c98f4953481eb44e3d0e64. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BXINV1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0131fee8a624c00025eb3dbe8703412529ed4ee8770f184034e75a5933c67788. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BXOYE2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc3ee0c24e55bc07abe74633418d1ce5b10a4a5936b4ee4d5b22cd5c9cde554. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/BXINV1800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4f84ac1d3760e220345d82d20bc8b47870566dcc1ace1c41ef6ad25794b7fa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/BXINV1800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07093bef0211b129d569bc1a19b0c88e9bfa25fca4bf3e35fa0c67bcd5d99461. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/BXINV1800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd712b63691f40cef749a5e49cfbb01ef448804635f08bab2fe1c4d148a76ebb8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BXINV1800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e888883cff7e3385a6cbef03c638239957befc3421d70490f053a88bff83a4. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/BXINV1800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224507061d2c02ba123d49bdbafe477035f2ceb1f4d2bc86b01436a2534014a4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/BXOYE2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e3fd9c4f6946c268b831ffb3651a961b4599d8b9014d5abc291bb754a7d81e. 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/BC52Q2200067.