Dawud may refer to: David in Islam Dawud (name) Dawud of Kanem, half-brother of the 14th-century Kanem emperor Idris I of Kanem An-Nasir Dawud, Kurdish ruler Askia Dawud, ruler of the Songhai Em
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 0x183b63eddc3de8481ac6d0fa97e565a434d8ca0c3913b58d0865ac2de262c52e. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56faa5ab-d14e-4068-89cf-f4f078baeedf.json and https://artists.proofprofile.net/proofs/artist/56faa5ab-d14e-4068-89cf-f4f078baeedf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).