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 0xc780c0c24fb554c89d5701a69ad382399b092e08e1cb13f1e133be52168c27cb. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a8949a7-87fd-4aa2-9d05-9ba86d43ca00.json and https://artists.proofprofile.net/proofs/artist/7a8949a7-87fd-4aa2-9d05-9ba86d43ca00.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ruud Hermans Sings the Hits of Bobby Bare
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 0xe425ec1b097508a9d4ca4c62347e90aedf55e9fc25f0c761fb3fd358750326a7. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:43:29Z), 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/NLG090641604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9cf4061f399e9be4670656324f56e729032edcbca6b8cc7f942618a66417a5. 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/NLG090802508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0091e3937f3a12661da556f4cbc7d7c006fdd4044db310e3443401719666bc. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:38:59Z), 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/NLG090802516.