Mad, mad, MAD or M. A. D. may refer to: People Mary Andrews Denison (1826–1911) American author, who wrote under these initials Geography Mad (village), a village in the Dunajská Streda District o
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 0xf2e1ef24803ae42a8583ed9d71603a446ded17afee6d0ccb4b887916605bba6e. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4e99398-f068-4e72-ae1f-9a06dd262fe9.json and https://artists.proofprofile.net/proofs/artist/b4e99398-f068-4e72-ae1f-9a06dd262fe9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).