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 0x3c454c632ac75eef6c9a6f7e8153717d0c40357435554382e55890255c9e572c. 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/28af89b9-6e0b-43af-b586-304916f9975a.json and https://artists.proofprofile.net/proofs/artist/28af89b9-6e0b-43af-b586-304916f9975a.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 0x89ca4aaf224fd966ad5c8ec42fb0447cbfe3722d4851b99256f332428e3f429f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USCGH1986944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc719f03b915855a51c0d7e4d8478d156d668d05f3cca73803163825905e06f1. 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/USCGH1986945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b196b7cfad54e0673837dde66b316aa3a9604821611d4caa71c1e1a1ef9bd5. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USCGH1986946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a69d0fc1c9c382411472ea40686faf14aa1a6e4e61a191b85ad387029c990f1. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/USCGH1986947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bd7aaa77af015c25206a53b1bdd8a24f3e1c7ac4875029afc9af1b78cce831. 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/USCGH1986948.
The Harp of Old Erin and Banner of Stars
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1ed5f2aa0e9233fcb57613f13d9b59b13cafaff061dc2a886114e35e518af2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USCGH1986950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d824fdc2a5981c4197975a284194315f71c1ba1b9330f57241a362fda91e47. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USCGH1986951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f1283d18f9600f62bee6aece9c742cc8a740234e15e1ae602c3356edd29a95. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USCGH1986952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6337d82a2fe9edf18dda731bc95b3bcbf70e5cb409bbbe7d72800ae792dff64. 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/USHM20636009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ee1594760574818f01c131bd6481bf81b8e7c1c3d9d0ef89f5aa22468be558. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/USHM20636010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ad802f5a1ebcb2a0efdc62edd6c014c8ba00a47d77c80f48d17fe20905bba5. 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/USHM20636011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5e191ce9ee7e7e9e408d61462fbdaa2e4177236d1667f6c28fd1e188350eba. 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/USHM20636013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1340a84237fb46c906770f8317b6c3d4cfc71f98e9a63488cdefe5244efb88f7. 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/USHM20636016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54abded32ea5ccd3370916e84356046f4330714744e546c2f5aef214d17401a. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USHM20636018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed684df6d599c4236186bf7a1f44fe79e7a092bb71477736ff6b2f7dd2bdbf4b. 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/USCGJ1902860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce50c8ce5b2fed03f2ec56cca24994b85dcd057ea1b53d229526b3e09230998. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USCGH2566908.