Donald Charles Frederick Messer (May 9, 1909 – March 26, 1973) was a Canadian musician, band leader, radio broadcaster, and defining icon of folk music during the 1960s. His CBC Television series Don
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 0xc42e7a6bc8ce26cbfd76bd8ed200af5fa9f93207b89430714b2001a42e0dd656. 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/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a.json and https://artists.proofprofile.net/proofs/artist/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).