Leopold Perutz (2 November 1882 – 25 August 1957) was an Austrian novelist and mathematician. Born in Prague, he lived in Vienna until the Nazi Anschluss in 1938, when he emigrated to Palestine. Acco
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 0x617c573fa88983e99a367900d418002ed422b2fe47ea5b6e7ed7a02691351222. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbf2d5d4-db77-4fd3-97ce-2969dbff9d7c.json and https://artists.proofprofile.net/proofs/artist/fbf2d5d4-db77-4fd3-97ce-2969dbff9d7c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.