Sir Ernest Alexander Campbell MacMillan, (18 August 1893 – 6 May 1973) was a Canadian orchestral conductor, composer, organist, and Canada's only "Musical Knight". He is widely regarded as being Cana
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 0x4d9b87c68006ada266c458ffba106e7fc00513b063d7fef3aeb424aea9c97b09. 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/e663200e-ffc3-45dd-8f78-055c33e3ef69.json and https://artists.proofprofile.net/proofs/artist/e663200e-ffc3-45dd-8f78-055c33e3ef69.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
MacMillan: String Quartet In C Major; Two Sketches On French Canadian Airs
Sir Ernest MacMillan - Portrait: A Tribute To A Great Canadian Musician
Glenn Gould & Ernest MacMillan: String Quartets