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 0x73c21e85e9b7382de397076ae9c380f9b3404c52efec12280ca8cadc935b42c8. 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/f7cafade-dbd8-4b77-8999-7bc1094b97fa.json and https://artists.proofprofile.net/proofs/artist/f7cafade-dbd8-4b77-8999-7bc1094b97fa.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 0x0c279cbd61129a3ef04e1c3e2d1a88189a150883cf09ac46618094e233209baa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAP800655511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c05a2b26dd117864e740d2565f8a5d6d9da842be020b5442d566479aab1aaee. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CAP800655517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2622f0d06a766876cb71871f5d9264870651a4abf83348a507d9787b0ec58251. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CAP800800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b8cce831b58923fe6220d6cf37fe687c16cb12ed95df76dbe3e0048c615cf7. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T09:57:20Z), 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/CAI601092010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c5314bc25abe1df664bf954325fecdb925f88c67800fcd0eda8db9113dedcd. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/CAI601092011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881da673447711c47545f70108a0a314e02abc07758c74ffab68b7c8d2313e6e. 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/CAI601092012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1dedf9085a700b4d300c22a7a25c2c29cdcd0c6fbf5d24c2511706a8b0e024. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CAQ521248104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f400ecd164e80a135cf95e6c242d8b52daf8047050fb8c376d48b001af9c2d. 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/CAQ521471211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b39897c3e735a87d3947058c1058aaacd7db119ddd25b0d1fc3c65edff2b54. 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/CAQ521471212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb03522188531904e18ee341ddef026d34fb37d651c291ce33edbce4ac740722. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CAI601092003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeee297ebf78aa051a5675b60f1b8b3bf9d9524eca8c59e1e7ebc1f394209da8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CAQ521471206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75b7c9cf27bc44b4a4aabb7d595a057bdd8e2a7520da1a5a9782304ed19a7f7. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/CA3GW1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b91d255dba22fe44755cc0af452896cda29a82953a2fb872954728cd9aada8. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/CA3GW2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7502534b97621b0e698fb385f5c1df4736d72b5b79834e10e69cf6b83592a5ec. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/CA3GW1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c66cc6aa9acbfcc3e9ef20c486f5345f92334b779600cf4f8803b84b097768a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CA3GW2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86656fb17ab871d3acae9da606d64ce43b65c360849f94529578c48274148cb8. 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/CA3GW2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd8b054dc7ecf571cc8d0396e276ab621e4a20771dfce8ed117a85194ccd447. 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/CAQ520400037.