Murk may refer to: Murk (band), a Cuban-American house-music duo Murk (album), its 2004 self-titled release Murk (film) (Danish title: Mørke), a 2005 Danish thriller by Jannik Johansen and Anders
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 0xeac1c159a215659a51d568f6b9f35bfec41839e1149f8e9752572517e80e3c97. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d04751a-e9c5-4457-a9f2-8329f54d5e9b.json and https://artists.proofprofile.net/proofs/artist/8d04751a-e9c5-4457-a9f2-8329f54d5e9b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).