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 0xe91f03965f145811fc7efa2ea6b6c4dc21c11d86573341330d500bcabea795af. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd9b9e5f-6f4a-41e0-ba5e-ab033dfe7031.json and https://artists.proofprofile.net/proofs/artist/cd9b9e5f-6f4a-41e0-ba5e-ab033dfe7031.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 0x2d39175cf49c9d93101b3c1238ee1d7b3dcf3444d2c674db921d7918c784cc37. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:47:52Z), 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/QZHN81921871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb590a9aff5af7c423585f97d1c0378813e3533cc55f4f4eaeff5bd08d495b3c5. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:54:16Z), 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/QZHN81921876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd18179074b636195276e2bb84f62270d82eaaa3bb59b1a3487cd36b082860e0. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZHN81921881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c74958bf8d8a151bc4a2673f1e4b592f08d442b86b411bf757bcffd3f542396. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:46:52Z), 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/QZHN81921883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e6e2481898ed8eca4e3b0b21bdd023ead376a8743a23bc68961296c6bee42a. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZZ7X2482464.