Sibu () is a city located in the central region of Sarawak, Malaysia. It serves as the capital of Sibu District within Sibu Division and is situated on the island of Borneo. Covering an area of , the
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 0xc628a0bb9b48a0159ba906f8a21f90a2bc388c685c2a99ddf344634f10e0e2e8. Chain 2 (Bitcoin): anchored in block 954004 (2026-06-16T21:01:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32d2dc83-2762-41d3-a837-7c4ad0a293d5.json and https://artists.proofprofile.net/proofs/artist/32d2dc83-2762-41d3-a837-7c4ad0a293d5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.