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 0xa275cae364eb264510f4c9255cb64f8a45d1bb8191c9ac56f0a1b1ad0f182257. 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/57939b69-cde7-4144-97e2-a2a9ee4d25ae.json and https://artists.proofprofile.net/proofs/artist/57939b69-cde7-4144-97e2-a2a9ee4d25ae.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 0x9d4106e331fbe3cda9a70fde9ecf2ba427fde8ba57c89565fcc0900b18ed7e0a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/EEGP32100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129f303335f35abd28c4bbe36e786ed2de9eb3faaef7c6cb7d26f8e1cf75be49. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/EEGP32100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c4078b9d8e53ca48478bc614106fd1c945ffc1fe8d450a386da81c6df6ab56. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/EEGP32100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9694303d39e014bdc0c16897b8d4ec7a110745442dbb772022bba7802171b852. 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/EEGP32100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3f5383b4f1c64352371f69e347910507caa68ffcdc67d6de326b86fc3122f7. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/EEGP32100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710c9b46600409f2958d82d2fc615f2ce01fae4d8823e352885ec4d2a2b408ec. 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/EEBO32300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f4a0be6c0e2610ebd073c278683cc09062626d166012448d04e1725bfb45c8. 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/EEBO32300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67235939263e4410f677f8ca72983398f6b87107c3fb30a077a7c4aa0cae27d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/EEBO32300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c3f760d7470ff4a33ddf1cf8e29c6b1f7a8a365af2ffb450fd7e31f21c1189. 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/EEBO32300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac711dd0b094d619a4a28250daf70f383abb75f66c129ffe8f322e8fceda9bdc. 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/EEBO32300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1b0ec99149c314f823bf11e48548bae54a95d1ade53c4fd0a4c756f8d5e61f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/EEBO32300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac711dd0b094d619a4a28250daf70f383abb75f66c129ffe8f322e8fceda9bdc. 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/EEBO32300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed8741f91eceb9fbacadea21c222e10c845ad97b4edfa2b4f967adcb26023a9. 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/EEXE11900001.