M25 or M-25 may be: Aerospace M-25 Dromader Mikro, a variant of the Polish PZL-Mielec M-18 Dromader agricultural aircraft Cors-Air M25Y Black Devil, an Italian aircraft engine Shvetsov M-25, an ai
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 0x8839ab1b59b5d586abfe020fba3323665523ea54cfec0f630a9f3a788bcfd4d5. 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/8a9ed17b-99a0-4bb6-9961-b74558ffd6e6.json and https://artists.proofprofile.net/proofs/artist/8a9ed17b-99a0-4bb6-9961-b74558ffd6e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).