1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 artist was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d7bc5de5e9f67774ff69382e5a6b82f4329cc476876ad1913999b0d644a1b1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c41e981-ff7b-4150-b4b0-1cdf334c4ccc.json and https://artists.proofprofile.net/proofs/artist/9c41e981-ff7b-4150-b4b0-1cdf334c4ccc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Eleventh Hour: Songs for Climate Justice