William Sigurd Bourne (28 March 1954 – 16 April 2022) was a Canadian musician. He won three Canadian Juno Awards, and was an eight-time nominee. Bourne's music incorporates a variety of musical styles
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 0x72aeb552b20fe12e91b89ca78a4d3066cb08a6e0b221e75a977e8d57b2310272. 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/8ca9569d-fe9d-43ba-a968-f705782daf84.json and https://artists.proofprofile.net/proofs/artist/8ca9569d-fe9d-43ba-a968-f705782daf84.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).