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 0xef241ce03fc30f6c4d9ee3aff7581f430633f27aa4518dd900c98b5cdafe684f. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0af4342f-15f1-4884-952e-6a48b24b7668.json and https://artists.proofprofile.net/proofs/artist/0af4342f-15f1-4884-952e-6a48b24b7668.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 0x44c235344a9155f8ab46a5f93567de5d9cd5e9d9e5cbf548cc43406f8f7baf8d. 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/GBSMU3247955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ef1e05d11d0ba57ed33cc56abb944a56c891ad4dea07f9ee0ee80e2aa7a8f9. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/GBSMU3247956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2715ae9bf4f409d03cb4ddad50ca5215d2a5c26c1c891649d86f4fdfd97f9ab. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBSMU3247957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde4289ba05783814ad9b3abc070e114f3cb8c2820a70c88614f047f8b399287. 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/GBSMU3247961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16ee38fc94a30b206d9f2853c72d8dbec5562e860b0bf83fc9245b3be525a63. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBSMU3247962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79472758fe6a760a5e5678f94771a12ddd8d4bc9cc4a05b60804c1c5dfc7c149. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GBSMU3247963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c490920c4862e92738bfc69e03d84accdd210683f761e8b7203546dcee66c12. 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/GBSMU3247964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaedd81a18d4ef81b024c6bcf9f5088865a0302ee586d15f7942140471043d29c. 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/TRBGZ2200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3f21392e83f2fed4ce7d9fac084fd04cf85b0e8d85c5818d5a55e6fd07fa16. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TRBGZ2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf117623c7d3a3d7958bbbf980a06df6d224662e509f0911f8ba01f8355f9be0c. 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/TRBGZ2200028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bf341b2dd169165406b048aa786ea5cb1fe564814914618b68cef5ab6e2b67. 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/TRBGZ2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0460a32f7439fb2410d73f7f2854504a9d09e7c35a2ec8dfb95167f2e6f42b. 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/TRBGZ2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369b47776b51ded3fb2da67e14d7bc47939927e4783cf505a045699a30138598. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:31:20Z), 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/TRBGZ2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497a36419ab57dfd880f84a29afd86c66f7ea73e1e510a45fe7f117bab68df32. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/TRBGZ2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b40399441a81f63fc512a44e1ad97fc9284778567923f515a6f5d4bb797d44. 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/TRBGZ2200035.