John Arndt may refer to: John Arndt (basketball) (1928–2021), American assistant (1960–1961) and head coach (1961–1968) of men's basketball at Loyola Marymount University Johann Arndt (1555–1621),
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 0x19c3f1d41841cc2e4a68d9a6b133f65521d4fdbfa30e600b739196581599d3d4. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3cf5f4d1-3cf3-4b2e-b203-7b504e797cde.json and https://artists.proofprofile.net/proofs/artist/3cf5f4d1-3cf3-4b2e-b203-7b504e797cde.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).