Mark V or Mark 5 may refer to: Technology Military and weaponry BL 13.5 inch Mk V naval gun (1912); British gun that was a defining feature of the super-dreadnought Orion-class battleships QF 4 inc
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 0xab6e1ff5f20226ed41eefdd5f2293f3334464bf336d77bada55ce7019303d12f. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9456606-3e82-4d1e-aecf-31674a7a8063.json and https://artists.proofprofile.net/proofs/artist/e9456606-3e82-4d1e-aecf-31674a7a8063.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).