People Darwin Kastle (born 1971) Magic: The Gathering player Leonard Kastle (1929–2011) opera composer Richard Kastle (born 1958) pianist Other Washington Kastles, professional tennis team in Washing
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 0x9fae0bcc24fb25892d91affb7a68e7dcc81255cc509517a9af5d47d2fe490393. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9071bc31-64b5-4d61-a507-a28f74b45f3b.json and https://artists.proofprofile.net/proofs/artist/9071bc31-64b5-4d61-a507-a28f74b45f3b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).