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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea99494fe1505eacfc6679fce43f3a2271831b3ae4ff4a66d3ac9b7f5244c35. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a86c1bbf-5c54-46cf-81cc-504796632e80.json and https://artists.proofprofile.net/proofs/artist/a86c1bbf-5c54-46cf-81cc-504796632e80.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).