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 0xb0e070a542f5a73bc587bf735257f161a4cc7358b5688be4975560d8c407a0d8. 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/5099eacc-c933-46bf-bcca-b4f20b767be2.json and https://artists.proofprofile.net/proofs/artist/5099eacc-c933-46bf-bcca-b4f20b767be2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xd02b4ac6b73be5ba8cd75e571f09a0560d015bb539846d62a5eaf2a250613360. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USANG2156095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdd2b253802fdcbbc59fc9b7f8511e30fab503b501aa1c37b194b0e123595b5. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USANG2156096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f891e003614c12a5ef2d131f6fd1462d902e3b1cbb1eac3cc96ccbd3ea43cf0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USANG2156098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac0b978d1595abbfc81b1a487e0405e08baf67f76f3587de464fc1783618814. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USANG2156102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50ae7c1301a0e31c1aea47f63e4c9c692467567ab6e22ffd161fe473a1377bb. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/USANG2197398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b9e03dc0de071659c2d6f39b9e68148c7984fde0363ae4aeef6a9a86def53a. 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/US3DF2173147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22777088358468e3a007089fb3c9a1dfa777fcc18aec0924364430bedbfef444. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM3DF2126033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d0081a842eedb4347736dc115a0cd8b70a0d0e4cfc94a092c6f3613827345e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NL4YD2100315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90633444cd24e1ecd650bda046f5cc3e0da24fd24ad01fa7f0dd1313ce48bee4. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QM3DF2194884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd316f3626989680e75c629d83eaf9badb6a3f90303649ead6979def7bb132d04. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QM3DF2194885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c03789f1f60617817d9ed7d53922ca751d6f08fec94340d8ba5eeea9097715a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QMBZ92249780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abe8d226ea81fa4759a832937ab830764131fd3dde6f8326396e04c0a7cde05. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USANG2226780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f6bc245ac3c78f4e552e62e92613080216c25e650e76c54823d9e6c479a6a6. 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/QM3DF2262454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f80ce944470daebf2bf65fbd021067c2fb3ec2fda2f2ae5f9f129f07505f00. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US3DF2478470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff479fdd54c62544ffca83a5a80c1f0821825307eb8837373db33a7630582be9. 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/UKZGC2406158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfc7558175c41e3dfc5fcc836cf0fb381e809062e7fc8a50edead56bd3c383a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2237582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f9df8291932c7d6424863a4a391cafac34fd6632bc82ea4deae5a5a7764e55. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKZGC2408508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d445e7f53deddeba05d6efa9beea26b13b3343b300c96d70ee002a165ce033. 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/ATUM42100204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ec02f099a1a0dbfa7c97a7be554f780a038d895cd4b414c02d0055520c9ed4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/US3DF2447703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f9df8291932c7d6424863a4a391cafac34fd6632bc82ea4deae5a5a7764e55. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/UKZGC2408508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8860e08aa55361c66c476007f0c008a6460d058c14ab516cdfbff45e85e248d6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2102423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa662afd2007dbbb64afa9fbfef6faac3e2fbb8914cc14df2d127816e3e952b01. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTAT2392040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718846588d40726955d6a28ca4344f8ddc2d8e3d1b759a8cc537a8935f6b997f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USANG2196906.