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 0x2a2cd9cd4522cbb002543ebd8b249973258feaa87d11e8440da48c2d1e71612b. 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/306a72de-f643-4c68-a7a8-32a4bd7d1d31.json and https://artists.proofprofile.net/proofs/artist/306a72de-f643-4c68-a7a8-32a4bd7d1d31.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 0x3d605858ff73747cd52ac495b5ef19f5a6033f8ebd0e94620666c4664a7ccde7. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/NLEL60800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe25748e4b7cd8c2bd857271021437f70c45a6f64208bf672d54c7f1bb4d4f. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NLEL60800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25e3da8f86bc57cd461acd6749318961ee33a0fd83871b106c287d4ba31b110. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLEL60800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffe7ae32f5caa5c41406180a2968b7512d7f3e0515b7524d36c4edf3bcf524f. 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/NLEL60800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1031b6559c52b1456cbab277fad15db35421bf7a32e81929a32bf05862b77c2. 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/NLEL60800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1463ba3c525cb9c7d055522cf950baca14d7096f64d038f1e61138d0e4f8eb1. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/NLEL60800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8913f55cb763e5c3c9b3d98081387d27bf74b4ad18c98481fa6428d2c8311c27. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLEL60800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cbdc934a84031bb70fe277caa7619062891c94867e4dd58290474ed7c68d91. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/NLEL60800012.
Jam - Live @ North Sea Jazz 2009 (Thanks to Radio 6)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb664ece96cb949a9b01520d1e88568e80429030b2d8eb03d57319f908435815b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLEL60800017.
Pitchblack Darkness - Live @ North Sea Jazz 2009 (Thanks to Radio 6)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd309b7cd1361a993ebb98a39b0fb1e5d7999dc1739064620bacab19a6d208d4a. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NLEL60800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31eb1d291277855a8d588118c1bc62b7409135da3274457f41ec2eee9a830ec8. 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/NLY160900004.