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 0x46cb7f7124c2d0cd6bfa73311de6073da5b773e8183b00f82acbe033813902dc. 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/1360ff45-5cf1-4807-9e79-132ac1ddc2b7.json and https://artists.proofprofile.net/proofs/artist/1360ff45-5cf1-4807-9e79-132ac1ddc2b7.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 0x2c2c2777b684ff0192e8493e86ad6027c1e735b4e3f37d101f8508de78b8a9e9. 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/BRRGE2400274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a9b0eb9b6d11039342455c0fd86ac012aeedae27dbb747a4429f3b8cf30028. 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/QZWDD2489928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73852f4a72ab66e31fecbea4e58072b39c01ade314c5138f257c5f9c63dd1c07. 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/BXIV82469105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca20359c53489ba254fb9e521244a6e54b61df5c742802f1bfcbd64dae25387. 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/BRUM72301354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca20359c53489ba254fb9e521244a6e54b61df5c742802f1bfcbd64dae25387. 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/BRUM72301354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6341e860e27fe6e531d2b443e4fe3104b6119f0b5af907ec1272bc5f3b9fa46a. 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/USLZJ2453269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a9b0eb9b6d11039342455c0fd86ac012aeedae27dbb747a4429f3b8cf30028. 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/QZWDD2489928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc9ea2aa751b92bf904af688763ff18253a3dfd6cade2671e50d1bd8b00ab3c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2421384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619f7956bd446edfe075fa95585d010792def1bcb6ed4e50dc9d6d5d60bfaecb. 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/QZTV32423943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8f1cb648e0b9c35c0ebaee6f9dff539ca08df7981262e71e31d5d06f9826a0. 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/GBWUL2477565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6341e860e27fe6e531d2b443e4fe3104b6119f0b5af907ec1272bc5f3b9fa46a. 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/USLZJ2453269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65932b437274e3da608a649d76a504911133da7c94171f1c9fd1ce2e837b517f. 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/QZ5FN2488962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5dab619ca63d791a5111b6d293b39dadda3d01a6908b9c49b13e7c3ef17313. 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/QZMZ92330103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631ec8992e8975d5a5830c27153a39ad297f485a540cbfc4553311e06927290a. 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/US7VG2352956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab3923ab01065276e07de2be6ace49a68698d86391cbe14ded97c9dfb16c519. 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/QZWV32376769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08849c3ea27ef3ab0bd2c0589c55ead9f5ca8e5c6de3ff9008fde6df479361fd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWDD2377079.