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 0xea9a0be17f4d0a2cbaafd7e4f21ef819784c1e9c020f21a18cd673180e0aa058. 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/208a4804-1cca-4597-8819-99096d4b5d06.json and https://artists.proofprofile.net/proofs/artist/208a4804-1cca-4597-8819-99096d4b5d06.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 0xcd5cd50783b734201084fea5b4c6aa196952fe561e01c4d15c91152b2b412888. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/FR10S2001091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e0705ac61843d56ec051e6122211648c35299053a7f7f3d9d1fa8371060c07. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/FRX281992533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf9c0d0f0120afa344cb1694b667d141eb86a3b180cc5d51c38bd40019a18d2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR10S2001046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372805cacd0ae679d048740c147dceada0bca23bedd7ca00686ad99779c62711. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FR96X1916883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27ec62b45a16cbe5090979f7999dc92e952cba93c44b681716c841ce26e4d1f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR96X1916885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174b712607c6b8a2b2ecb3de4b2541249b2f69dfb90bac65a3806ac860d9878f. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/FR96X1916901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897020030e4dcd2e79889ae9e2f7af013ac6f25ddf5240513671a0304b7e83b4. 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/FRX281992988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a213e17a3a48f722e22aaf8f4f9dd4cb5ff36762b3984620c39e089cd8acea. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FRX281992970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2209675ff61a7941285dbdf54928c9b467109e49f97ee9320664c3afeca621. 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/FR26V2017084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae0467855259da495e72fdff9a6522581c1aaba4a699ecb82762ae8cbe6ce89. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA052039382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6fb01206c1c383475a1009bd682633995a21a8f0ac41d2d19d461907db1eb4. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/FRX282276611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d550ef257ec9ea2daf5c2bcf067b938fbbc5b71ca5a4b0d0daa5ec7a4244524. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/FRX762225427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd69c7f6f2bd54ad3fdc022663d5e174c3925046785b15dc9a4dd0cfd6650b6. 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/DGA052313293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148cdfd08f4f576c4c262cef2b7ea04ae856efe0073c807b24dacef4ddb85379. 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/DGA0Q2300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4176bba453a577985f793c54f1d3755185e6c30b16d66a1b536f76a132a4a1cc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA092410397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2338d52a4d3623bfbebc22fab71bae9278ca91b470672c0a9f7b166340e3ae. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DGA0S2414970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7880d23f9c2c2fa325cf39fe89f4f93b80585a5b889233d1308e5f1f63cdd3. 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/DGA0S2497009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c9377629afd21f1185ba857638b0060f5991d01ab81e193d000e3f8bf1ec36. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/FR59R2588946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78020384227bef64e07217de7119109710b8ef491f8286faa7efe7cacea671e. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/FRX762544665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b143c23f5a23988c721e5c388a9ae7b8074802a3dffec19b2ace9c3e73a2cbd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG1469235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95f449485fd9a6203844d55120b2232245559d85f25c331023f403c317c018b. 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/FR2X41873493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060530522e2a456af47a8e6b26e68fd137b1cb6517f7e75c6ca897813b623f77. 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/FR2X41873502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950ff119d64d9c65a7db8dbfac5f5ef4cbd923f88cbe4c7e6ddc6b893a4de548. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR2X41873509.