Vanku or Vaanku may refer to: Vanku, a fictional sage from the Sanskrit poem Nava-sahasanka-charita Banku (call to prayer), the Muslim call to public prayer in the Malabar region "Vaanku", a short
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 0x4853c0a85dd2ce937277472137e0f5991eee53e8a2b93118b2478b826c9bdc03. 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/5b99f5d0-9ab2-4721-8ea0-d91eca23b78f.json and https://artists.proofprofile.net/proofs/artist/5b99f5d0-9ab2-4721-8ea0-d91eca23b78f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).