Kat Cressida () is an American actress whose credits include voicing the character Dee Dee on the animated television series Dexter's Laboratory, as well as playing the Bride in The Haunted Mansion at
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 0x0b77d5c64486117229879f6f7d56cebdd3e3725f9c77e40206417e73fc804e14. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18023efd-2c45-4c40-b362-0d4c9e70af75.json and https://artists.proofprofile.net/proofs/artist/18023efd-2c45-4c40-b362-0d4c9e70af75.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.