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 0x23a66ace521ed7aa322993ed3c86417e2bcd4d32992cd2b50eb9bf2f47002682. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b2a4f89-5b44-4ee9-ae84-5905821e2878.json and https://artists.proofprofile.net/proofs/artist/3b2a4f89-5b44-4ee9-ae84-5905821e2878.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).