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 0xf4c2487d87d3d56b9b15a95e3f2d9b63fd6927211eb6075ca3e5263e552d6f5e. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a1b1d55f-b2a5-4707-acf2-fe7c982db2ef.json and https://artists.proofprofile.net/proofs/artist/a1b1d55f-b2a5-4707-acf2-fe7c982db2ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Natural sounds Series-2 WAVE from Newcaledonia&Jamaica
Natural sounds Series-4 BIRD from Japan Birds
Natural sounds Series-7 PASTRAL from Pastral
Natural sounds Series-8 FOREST from Forest
Natural sounds Series-6 STREAM from Alps&River