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 0xea128cbe623b7cdd90839fa02f2496d912f6b00401e229634b73f573cf1bd7f6. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4cb6dc8-36ea-46e4-bffc-041e3512ffeb.json and https://artists.proofprofile.net/proofs/artist/c4cb6dc8-36ea-46e4-bffc-041e3512ffeb.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 0xd381e9a1f5ea507130c446628c5e614488b769ae989bdc6f8b8b45d5bc32c289. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEPQM0611685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281b4cf8c311fe5ab39c7a82ec88d0aae20a213a5ef3042c8ad274431de9fed2. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/SEPQM0611691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83ef46650c14784a182f7e57910082aaaf5fb1301a03b50bcc6b1b57675a6bf. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/SEPQM0611698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cccdf9929ff75dd676e261535d6cf51ff8894461a6d05b096d44bbeb6d33d3. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/SEPQM0611700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e468a08555199abbfabafa66ce61135cea233db724a152f55b5b8e7a2cf30ae. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/SEPQM0611705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad7fb686489c83a82bb84567157ce5bc1d8fb841d7248550b63452043faca83. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/SEPQM0611720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f90868a3badca1d5f240b794f66bf8b90db36bf0ceed2168062fa6dc31d7e5e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/SEPQM0611731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9f1047e2ca3a136e9c1880fc8f037cd750f86810811a6b86cb22c7ed2ef965. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEPQM0611732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa73d62abd6175584b128019d0fb99e64937666e1e81627dffb914487756987. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/SEPQM0612277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58cab45ae588d9f5f4e4c3aa3fbaf942b66b6f69928c9ca835108d219bf977c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEPQM0612289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce943b6ebd69d4f7fa4e1105d1a14cee64d95647e1fbfc1196b2fd7bc690f8a. 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/SEPQM0612291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b77759ca4c1566ec40af860567338a423b56eb7615c96e1744fefdec76c688. 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/SEPQM0610678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854c24b159116eae439fa57b3421fcb46cf8c8c5e95d0fc0a71374a2220d4814. 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/SEPQM0610857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9408fb4a3aab147c2bb13aa42d4adee93092db3a3ca8fe46b6abafa10a758da. 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/SEPQM0610065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385e69fd95c234d0721879a584a8191b50d5a1c2f48843a18dea34c9b698ed2e. 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/SEPQM0612672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8909f6f0d2728da6538e8babad2d7b0047c88c6647fb310786a2f090a1ffdaee. 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/SEPQM0612677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e68cc782e592cb9029fbd5a562c165b8a53598ec5e611359ff509205ca9049. 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/SEUM70800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523a9b258a9138b1267678dd40b9fa390e061e3bd93372db635108d91eb33dfe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEUM70701402.