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 0x0649b86fedd62e8413e3b4b286c69a1cc9c60da0264d030d9a883100440f1189. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84eb642c-a947-461e-a8cc-a052570cc4ec.json and https://artists.proofprofile.net/proofs/artist/84eb642c-a947-461e-a8cc-a052570cc4ec.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 0xb22d0509834ca3f5c8694f9b5fb38b0ab6569444927dfc4eeab1f102654ea868. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QZTBC2410391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf695425e146cd0027853871c369d4b9fb864e21a080bdec36d429885dee62a5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTBC2410392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca51a9ccce9f978f356f8a5e5d48f3163f596486436b981b984c54244a8bde6. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZTBC2410393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ee017c70684ba89ff3df7dc218a7b9c415779cd048861f08d14934ab515da0. 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/QZFP52362957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e0b464c2c6e2bcd4e6b739c7a1574eaccf25a3dbcb0f58e74cb0b3b89fbb17. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SE6HN2491022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91355b245c4ab5151bf166a083448a1dfcbd0ec96fc5ef2eb6d728b2e8cbb481. 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/SE6HN2491023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf963a7387ea623df213621a7fcb41674ebb0c16bdd088b14be63db62f7bed8f. 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/SE6HN2491024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83a7361bebd860549b39a94115e787bb8faf0f90d5e0a3c5ddc2c2ebe89f53f. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/SE6HN2491025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3558460363daa93f703b8a68ae6fd1e6e24ad3203be0bd40780c181d7f8e9e8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SE6HN2491026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6c8c4537da1c2a7f87a58b66e559661c7c3321dd9a710eec8542bfca815935. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/SE6HN2491027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f61a99ca1e9defb8eeccbbb5703b25faadfc5cb256972ced6d7f3726ad95b82. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/SE6HN2491028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05141915540bcc32c9f127e574aa9772b93ec8f892200c9bdd08c52eaedfb409. 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/SE6HN2491029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa46854253f09c0cdb505842cc01d2c231136dc47c3b4de8b60e918162d002e. 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/SE6HN2491030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6820e045afd4aba4fdd136a63fbb975c8068ea1f2ace43d8256742650297f9af. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/SE6HN2491031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338e6a832557f2600f56bf7598d4ab6dea7291f57131eca74ec1cdde83e2fe05. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SE6HN2491032.