Gunawan is a common Indonesian surname from Sanskrit (meaning virtuous), its also a localized version of some Chinese surnames such as Guo (郭) and Wu (吳) and it may refer to: People Indra Gunawan (di
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 0xe45f163a821c18910480639b84ce2dc7b987778db3187995851b49f1d436d166. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d59b8576-6674-465a-805a-0b99f13799ed.json and https://artists.proofprofile.net/proofs/artist/d59b8576-6674-465a-805a-0b99f13799ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).