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 0xd94403110bba262bec23f2e374194a498eb3bf604c723e784ff70c5771d1547e. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/917fa505-fde6-4ed1-9055-4a91e7a0a232.json and https://artists.proofprofile.net/proofs/artist/917fa505-fde6-4ed1-9055-4a91e7a0a232.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schumann: Papillons ~R. Schumann Piano Works~
Schumann: Klaviersonate, Op. 11 & Davidsbündlertänze, Op. 27
シューベルト ： アルペジョーネ・ソナタ