Jórunn Viðar (7 December 1918 – 27 February 2017) was an Icelandic pianist and composer. She was the first classically trained female composer in Iceland and her music is frequently inspired by Icelan
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 0xcea28c8c4285de38af0c42817ee55f4793b708b64a91cd1a10c9dcc014017870. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60b07a09-73e5-49d4-9aa8-0631c3594da2.json and https://artists.proofprofile.net/proofs/artist/60b07a09-73e5-49d4-9aa8-0631c3594da2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Viðar: Ólafur Liljurós: Crotchet = c. 144