Árni Grétar Jóhannesson (6 December 1983 – 3 January 2025), known professionally as Futuregrapher, was an Icelandic electronic musician and one of the founders of the record company Möller Records. O
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 0x20990b5ea6319571c2422c99e96450fc6555a763dd0143f720546a62b20930e0. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7d54214-ba78-47da-bbe5-7c51dce45462.json and https://artists.proofprofile.net/proofs/artist/c7d54214-ba78-47da-bbe5-7c51dce45462.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).