Quesada may refer to: People Quesada (surname) Places Quesada, Spain, a town in the province of Jaén, in Andalusia Ciudad Quesada, Alicante, a town in the province of Alicante, in Valencia, Spai
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 0x80d2d116732bf0a4ccab857b1fd77de392f68ee68cf2316ba62cabad88d93da9. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0f5d1a3-f9e8-49dc-a628-78f2563a3451.json and https://artists.proofprofile.net/proofs/artist/a0f5d1a3-f9e8-49dc-a628-78f2563a3451.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).