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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66e1ac18925a38cdbf1ad24f6000c1f68b9c4fc35a59dfcec6298743892aad3. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2bcc6893-1cb1-4496-a3fc-f0f346a5158f.json and https://artists.proofprofile.net/proofs/artist/2bcc6893-1cb1-4496-a3fc-f0f346a5158f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf524126671e461eeeeddba1cb56b099f17fbac6945ae7bc188b41a7f6d9e6a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-17T04:12:53Z), 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/TCAHZ2470082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683abf022c4f2ceb2730d77eb828f190f4030cf474cb8b86dada65b555c025c7. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/TCAHZ2470110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d3f9723e65f09374b64afcf076fbf30926681723f5b1fc6658492eb54f9dd9. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/TCAIE2429934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75749eda5277be30e3f6375281ed8632e540512bc07ddcfdb1d5ab42d855abc. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/TCAIE2429951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf85708ef275deedea368d6c2fbf31447fc30e8ff7ee53de3535cf50554c6f8f. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAIE2430005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9b7c16c9b7b205d710d26738e05c82cb50385ca3f6d818ca5ae8a781863963. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/TCAIE2430043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b596515ffa4bee59783a669f4b5fb60cbbbe6c914bfe9c4dfc3d33819802f7. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QT65W2516319.