Stubborn may refer to: , a Second World War Royal Navy submarine Little Miss Stubborn, a character in the Little Miss series of books Mr. Stubborn, a character in the children's television show Th
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 0xadb97166c507db784cdf784992cd776d41ea553a863e7ad128cbfcf9ef68106e. Chain 2 (Bitcoin): anchored in block 953879 (2026-06-16T02:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/099e50c8-6e96-4aad-b270-d74fec4c0c8d.json and https://artists.proofprofile.net/proofs/artist/099e50c8-6e96-4aad-b270-d74fec4c0c8d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).