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 0x087430ef67b38d3f3931700415ff159d379ba6b0663a48f317fb8f94f7616c30. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81f54fa8-8317-4981-9210-0c7a2d8b90fa.json and https://artists.proofprofile.net/proofs/artist/81f54fa8-8317-4981-9210-0c7a2d8b90fa.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 0x717ee6b7f1d0040fb9044acd60a9cb881a5128abb142088c3ed61a88de069ef2. 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/QZNWS2357061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5014a25a3bb67dd4ef651fa5f0335333da88fd75bc5ad1a88729d3c8d62ace81. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTBD2321372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509f3fab273779edb1d989a943a12c06e179a4ea3389863d862f485b20b215f8. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZHN72124908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509f3fab273779edb1d989a943a12c06e179a4ea3389863d862f485b20b215f8. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:08:14Z), 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/QZHN72124908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe372c9166f998f0c23ec4bdff1370ebd8911f8fc363347b0de08deee35dd50. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTBC2486865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375e629eae55ad01d574a44bb75e3128abbcc8ae1216ab27e6a57e67b4a90771. 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/QZTBC2485967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375e629eae55ad01d574a44bb75e3128abbcc8ae1216ab27e6a57e67b4a90771. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTBC2485967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb1fd15d4eb174a3c0bfd49a6a1f7d2ad62477d3dd9d62179ba2ca13e8aa0f9. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZW9L2458812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf659e2e38e6bd5534b19079e4a70abb38649d56ec81fdb59a9ac61b32c31a27c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZGLS2580385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc054e77dd984c6438867e0a9821e93adee5df4178776ed0f723c385e8f60f02b. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:09:43Z), 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/QZNJV2561407.