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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f38f7aa9d2e259b6ee38569c7309cf8fa03d3bf46c9674959291afd6e9db8f. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2fa6fac-3709-460c-ba11-ec49f4fd56c2.json and https://artists.proofprofile.net/proofs/artist/a2fa6fac-3709-460c-ba11-ec49f4fd56c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Heart-Melting Smile of Babies (Joyful Piano Music)
Let Your Baby Sleep - Calming Piano Melodies
First Footsteps of Baby (Joyful Piano Rhymes)
50 Gentle Piano Sounds for Kids Sleep Throughout Night