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 0xa03dd3a892919dbfd60a39fcb27990f9bc179bd2996c56c6b58790e7e0d50429. 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/0d316395-d3c7-41f6-b247-b87f82a07814.json and https://artists.proofprofile.net/proofs/artist/0d316395-d3c7-41f6-b247-b87f82a07814.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 0x05908bfec9b67362f15edeaef8a5b03f4dc171b390c20ca1062e1cb82ad818b8. 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/SE3OH1730400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7d51190c0c7cb329f49ca494ea56ad6416903ee5c4506d9f37baf5c301f4ac. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/SE6HN1964501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020c0091b2288f27496ba92b78ea9b8bbc45bc4b93331fcc0e033d0dc5132b23. 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/SE6HN2031029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d30937b4dc72b389e0a53c5412f2c9a7f41ab531b86078e39051e1184f0d9c9. 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/SE5751987251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c19020c2aef5970d0864adafa6d11e2136048a73e41f9488497dc8b7c266c5a. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/SE6HN2031033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82900e77853983a5e8cc1a52902c1ec22b6d65c96f49d37ecb56b8e922eeef5f. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/SE6QE2017498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cf3f87dc2963460485da4ae57f19d792b5d66f41d74c322e38abb3d83a5b24. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/SE6XX2115667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e11856d9816b83b73fc624f5fbde4417c949f6d5408e1bdd702d65c6367eb4. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/SE5BU2223530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a8e830f29a18b88fad1b53192afee78143c2b48f1f30e35ec8473be112ac4b. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/SE5BU2294674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de21dd914a9b5f363dea2a825dbcff6d61b371c277622178c54240bd5cff939. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/SE5BU2506955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f236de4ff85125694a45dd27f3bfc159fbf91ff5c4eb98883688fa60cff3c1. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/SE6XY2534818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36eb7caab74e097287ad40c0617d7aafa3708631114c9f8da4d9895f50c984c8. 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/SE6XY2545746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf752bf47c5fe25d83bd4c61693211ca148089041a10beaa28c45d71a54e04368. 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/SE6XX2575027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2cd028329be154b7de31ea5b6ac7539683699a19abb8953dff6e61bb3bbc0a. 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/SE6SA2534545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d29c1e21dac5ad055e172177ff56986b2ce839a3681eda4831291a9b71b9c3e. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/SE6I32531528.