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 0xb5a41789da08ade57a1f646da7d12e3994a74f62321f5d8742b70a063f6c1059. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3368338-cdde-44f9-a218-3a97f2f646b1.json and https://artists.proofprofile.net/proofs/artist/c3368338-cdde-44f9-a218-3a97f2f646b1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Yankee Brass Band: Music from Mid-Nineteenth Century America
A Storm in the Land: Music of the 26th N.C. Regimental Band, CSA
Cheer, Boys, Cheer! Music Of The 26th N.C. Regimental Band, CSA Volume 2