thumb|Monroe recorded the first version of the song with his orchestra in May 1954. "Mr. Sandman" (or "Mister Sandman") is a popular song written by Pat Ballard and published in 1954. It was first rec
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 0x1eb2607cfd101cede80e3cc7232cc81e28ff9ddd571d8712df0e152eea74b089. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2226da9d-5f40-442c-90f9-946319ee5823.json and https://artists.proofprofile.net/proofs/artist/2226da9d-5f40-442c-90f9-946319ee5823.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).