M2K may refer to: Mew2King, a professional Super Smash Bros. player M2K Mini Tour, a mini tour by heavy metal band Metallica MAP kinase kinase (M2K) M2K (postal code), see List of postal codes of
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 0x816928e773c1ad3b6a0d1104911fb7412ded3a1dcf23dfdd97583de85e2a112e. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82800b5d-3e1a-46a3-b60c-fbdec2afff83.json and https://artists.proofprofile.net/proofs/artist/82800b5d-3e1a-46a3-b60c-fbdec2afff83.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).