QBE may refer to: QBE Insurance, a multinational insurance company Query by Example, devised by Moshé M. Zloof at IBM Research during the mid-1970s Microsoft Query by Example, derived from Zloof's or
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 0xf1f0dc0e48123657630cf2c435a7ecb1b0ed414c4c8d0c30cccee9cded84afce. 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/753d40ed-9ab5-40f8-9737-b5705e79e47b.json and https://artists.proofprofile.net/proofs/artist/753d40ed-9ab5-40f8-9737-b5705e79e47b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).