David Castañeda Jr. (born October 24, 1989) is an American actor. In 2019, Castañeda began portraying Diego Hargreeves in the Netflix series The Umbrella Academy. Early life Castañeda was born Octobe
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 0xa8b7a30ffa7c06c87319e44b73e27e222f985c599d128a6bb9a9157b676c0d6e. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0f5dc45-07c9-4eb4-b2b2-0d73a4285fb3.json and https://artists.proofprofile.net/proofs/artist/a0f5dc45-07c9-4eb4-b2b2-0d73a4285fb3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).