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 0x91e32055d36e008a2b85a048b06cf2c64945c004a59330f47936a26888d8532a. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7e44a21-3c12-408d-bed9-3a80ed4f13ca.json and https://artists.proofprofile.net/proofs/artist/d7e44a21-3c12-408d-bed9-3a80ed4f13ca.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 0xdca0ff21c5bbf2977c944bef11028ffdf6ae618b613049ec0e96ec20dc27e40b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:50:49Z), 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/US3DF1941472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ffb409cceb5854d6d6d3c4b815026777e44b1127c92ea675ea4700d9eafa4d. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/US3DF1941473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1b12235c25df9bdfdc09b570e50863684491a3551a1ff03c9cd15eb1d91962. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/US3DF1941476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100fcf729c8f20ce063a8ec511b8a3f3ab21dbe1512022e17f44fe142320cee7. 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/US3DF1941477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9cd7e3727ff47def506f985e04047d0e1dc9839d5c1fe6054655d3d60e625d. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/US3DF1941479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadd6ba3299419ca1d520b99639d090018358eee47719e01961bcdd548829822. 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/US3DF1941480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064c0ce3ca62bbc0b4b4014eb5a9636f1cd1e5dfed1ec281479f742559fe4a6b. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:28:04Z), 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/US3DF1941481.