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 0x375c55a1279e87b699a71185d95d469d357d5e4b793ab850e21d34b14a22c8f3. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1399883e-21b4-4b74-a575-932e77f1fdef.json and https://artists.proofprofile.net/proofs/artist/1399883e-21b4-4b74-a575-932e77f1fdef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sleep Tight My Baby (Vibraphone Lullaby)
Twinke Twinkle Little Star / Hush Little Baby, Don't You Cry / Bingo / Baa Baa Black Sheep (Medley)