Dreimal sieben Gedichte aus Albert Girauds "Pierrot lunaire" ("Three times Seven Poems from Albert Giraud's 'Pierrot lunaire), commonly known simply as Pierrot lunaire, Op. 21 ("Moonstruck Pierrot" or
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 0x9056b2ec011ce84da9cdfcdd93907a3172e93c61fb2813ac7011ec082caa94bf. 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/18dc6313-f887-4dde-985b-ed64b513ffcc.json and https://artists.proofprofile.net/proofs/artist/18dc6313-f887-4dde-985b-ed64b513ffcc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).