Basch is a surname. Notable people with the surname include: Anamarija Basch ( 1893–1979), Yugoslav activist and nurse Árpád Basch (1873–1944), Hungarian Jewish painter, graphic artist Evert Basch
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 0x144a429776bab4e9e73266e0b4a2b0e7ecbf63af89a002bd9d1c2eeea4a3ea07. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b154833-7d12-4e40-8d44-ed15a264afa9.json and https://artists.proofprofile.net/proofs/artist/2b154833-7d12-4e40-8d44-ed15a264afa9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).