A silent piano is an acoustic piano where there is an option to silence the strings by stopping the hammers from striking them. A silent piano is designed for private silent practice. On modern, elect
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 0x275cb047a7d699c4af364ff7d827b31b11a9ca0308fbf98505f0f0ada48c2311. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a2cffe0-956f-4af7-83c2-05e2fa888226.json and https://artists.proofprofile.net/proofs/artist/9a2cffe0-956f-4af7-83c2-05e2fa888226.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).