BUX is a blue chip stock market index consisting up to 25 (currently 16) major Hungarian companies trading on the Budapest Stock Exchange. Prices are taken from the electronic Xetra trading system. Ac
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 0xf22f991ecb192c87ee21be80b10a9ab93b7524d503c9d3eddd9289454b6d3b03. 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/76c94a72-ce39-474a-b4c9-2cd84c588af8.json and https://artists.proofprofile.net/proofs/artist/76c94a72-ce39-474a-b4c9-2cd84c588af8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).