Matilda or Mathilda may refer to: Animals Matilda (chicken) (1990–2006), World's Oldest Living Chicken record holder Mathilda (gastropod), a genus of gastropods in the family Mathildidae Matilda (
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 0xb8f668f0f41e54d94c3803bf84e57dde8b131a3b07e90ff949da00be08be2289. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ed0837b-234f-4ffd-8ffc-8bda3c0913c7.json and https://artists.proofprofile.net/proofs/artist/6ed0837b-234f-4ffd-8ffc-8bda3c0913c7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).