Kalisch is the German name for Kalisz. People with the surname Kalisch: David Kalisch (1820–1872), German Jewish playwright and humorist David Kalisch (economist) (born 1960), Australian economist
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 0xf2462b392ef9349aef229d712025aa698350f32c1673a39f02abb22414a8a23e. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00bc528a-459f-46ea-a301-391f73786e93.json and https://artists.proofprofile.net/proofs/artist/00bc528a-459f-46ea-a301-391f73786e93.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.