Chris Mars (born April 26, 1961) is an American painter and musician. He was the drummer for the seminal Minneapolis-based alternative rock band the Replacements from 1979 to 1990; he later joined the
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 0xdc5e0451ea26325848162b302cf0d23fac89dfebcd0b88bdbb4a0c8e99b6a663. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8603c1a0-af48-48d8-8b93-37941a47d4d8.json and https://artists.proofprofile.net/proofs/artist/8603c1a0-af48-48d8-8b93-37941a47d4d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).