Karl Grossmann may refer to: Karl Grossman, American professor of journalism Carl Großmann (1863–1922), German serial killer Karol Grossmann (1864–1929), Austro-Hungarian film pioneer See also K
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 0xaf7b155058bf7b43998c6b41134272b4bb99c7a130c359bf2b2e2e2964031e37. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97564972-04f3-42a7-a748-1960504d15bc.json and https://artists.proofprofile.net/proofs/artist/97564972-04f3-42a7-a748-1960504d15bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).