Zul, ZUL or variations thereof may refer to: People Zul Kifl Salami (), politician and economist from Benin Zul Yusri Che Harun (born 1986), Malaysian footballer Zul Sutan (1957–2018), Singaporean
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 0x2af34e8aa95dfbf00e9f7e65dcd3868baf3a5146372c2f99502c014ae8f4ab34. 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/586d422a-e7f1-4196-9a80-db28ac0b4c12.json and https://artists.proofprofile.net/proofs/artist/586d422a-e7f1-4196-9a80-db28ac0b4c12.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).