István Tótfalusi, born István Tóth, bearing this name until 1960 (Budapest, December 8, 1936 – August 29, 2020) was a Hungarian writer, literary translator, linguist, editor, and a recipient of the At
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 0x4c030a6a5e996ea4f2c0708b87bc7c1e6af566f1dee683a21ca18fa91d3c48af. 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/8db005ae-0cd7-414e-9c07-0ac5ad457545.json and https://artists.proofprofile.net/proofs/artist/8db005ae-0cd7-414e-9c07-0ac5ad457545.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).