Gson, or Google Gson, is an open-source Java library that serializes Java objects to JSON (and deserializes them back to Java). History The Gson library was originally developed for internal purposes
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 0x791ba18a6a2c8874652b9332c11c327cff9e7b62bf8de6f69e1d3155ad55c6ba. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8dc645e-5f66-4aa4-9b06-be335690f8f2.json and https://artists.proofprofile.net/proofs/artist/f8dc645e-5f66-4aa4-9b06-be335690f8f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).