Katz or KATZ may refer to: Fiction Katz Kobayashi, a character in Japanese anime "Katz", a 1947 Nelson Algren story in The Neon Wilderness Katz, a character in Courage the Cowardly Dog Other uses
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 0x9dcbcd5c1898c59b9bfd0c898a228c59d5bacb62eb51f26c4563fd762bc117dc. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1f41431-db8e-4e78-95d7-8c26917578a4.json and https://artists.proofprofile.net/proofs/artist/b1f41431-db8e-4e78-95d7-8c26917578a4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).