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 0xfb4d2f069e33f9db40a4f8f209a6beac19f8aa6f02bbb63837d514891aa93185. 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/c7d31bdd-5ebb-4b13-abad-c62221dd71c7.json and https://artists.proofprofile.net/proofs/artist/c7d31bdd-5ebb-4b13-abad-c62221dd71c7.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 0x5fc5b2e2bc3ea88e27032294a4f7b2bc7282cd8f10252c60ebeaa6eab4f4c419. 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/QZES92373900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff18b95c76d537d15555705715759bea76ffce69328e2dee135c9c64c3f9e41. 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/QZES92373902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4a70ce95d2cf690c8404863b3da4e343b1e074003ffcbaca5c8ab1d2e2ec90. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QZES92373898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fddd2bee5f7d5cf60ded5c1c2ef2e97f64e5feabffe4a5a50103136e298a4b. 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/QZHN32356313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7bc3186123bd48671fd667d0764e3e2c9b485817580e9727c3acefcd0bda16. 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/QZES92373456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc652d766013fc5f1d578766d6401a5f7456446c6193ea6e55d3f4991a6b8b76. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/GRSTY2300699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041fe809accf347a521b5994d8d01288407c98de83c3b8c863d292e669f60dee. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GRSTY2400788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae2a49d924b49ff1657e76a8d57f6cbcfc9964c0d96bbd13419be1c3638447a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GRSTY2400962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde3a8e57f1eb9426bd6fa90a72757f0cf9b7021baf1d15b73ddb5a37bb21cc7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GRSTY2400966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61196e3e4e80e7993cb3d66641d565b1d11ef4e4759de0bba02096686f068bd5. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/GRSTY2400967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7990062bdbbdce20673cdcaacbde117b54992ff7b6c5c3db65d25737baaba3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRSTY2400968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c6c6565daf646f0968e12faa530945122b68ac84c588669ecfaf0bb42e7000. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GRSTY2400969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc74a917c2a159eb90370d3689f521021b478a8e596d0c2a1d10bf9b14166cd0. 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/GRSTY2400971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f9d42c93e4ed3a964037bc06f0d25a3d360e8eb99ed87a26001763db70072f. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/GRSTY2400972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4f3abd36bf15c86e44d85463d91eddcf664a0b4b12214e9fcd9e5d330d3736. 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/CH6542339124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba265c40773f3e249edebff1db6535297e7f888cb04f12108162b1ef75e3d457. 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/CH6542339123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b7b1fbc3bae2558358a7760767da19a1558387e7d7cbfcf197a4f4b2aa10dc. 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/CH6542339050.