Champa(Cham: ꨌꩌꨛꨩ, چمڤا; ; 占城 or 占婆; modern Vietnamese ) was a collection of independent Cham polities that extended across the coast of what is present-day central and southern Vietnam from approxi
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa489d7981308f8118aba42d9835772d1f71ff1441bdb7d428411efd96ffe7c5b. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d086d445-ba17-4d57-874d-5518396d3dd0.json and https://artists.proofprofile.net/proofs/artist/d086d445-ba17-4d57-874d-5518396d3dd0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).