Mark Karan (born January 13, 1955) is an American guitarist and singer. He is best known for his long-term work with former members of the Grateful Dead, in RatDog (1998–2013), the Other Ones (1998–20
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 0x725dbc108d95d8e403ee2a3267e9b28ae4962345e4430fc9d6b76ce4287c3888. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5fdeaa00-858e-4e3c-9b0a-7fe1f5164763.json and https://artists.proofprofile.net/proofs/artist/5fdeaa00-858e-4e3c-9b0a-7fe1f5164763.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).