Marc Seales is an American jazz pianist associated with post-bop. He was a student at Western Washington University, serving his senior year from 1977 to 1978. Background As a Professor of Jazz Pia
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf362b0be51d2fc588afc51a6f61d0cd046bafef1219cfb57f0b29f8155d4de2. Chain 2 (Bitcoin): anchored in block 953954 (2026-06-16T14:18:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25d1c522-186b-4441-ad22-73213ea42290.json and https://artists.proofprofile.net/proofs/artist/25d1c522-186b-4441-ad22-73213ea42290.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
American Songs: Blues...And Jazz, Vol. 2