M60, M-60, or M.60 most often refers to: M60 machine gun, an American machine gun M60 tank, an American main battle tank M60, M-60, or M.60 may also refer to: Firearms and military equipment M60
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 0xd7c5a8ac20d4739eb705451f0c9e3544a1c3804c1918515fb85158083205a570. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/528bca88-2105-4fd2-83c2-248698912914.json and https://artists.proofprofile.net/proofs/artist/528bca88-2105-4fd2-83c2-248698912914.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).