Mark Warren Spoelstra (June 30, 1940 – February 24, 2007) was an American singer-songwriter and folk and blues guitarist. Biography He was born and raised in Kansas City, Missouri. He began his music
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 0x41ff235627961b31c63390ff6011448d14a9d34eb3a9aec7be3e22fa0dc647d1. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6.json and https://artists.proofprofile.net/proofs/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mark Spoelstra Live In San Francisco 1965