Citra may refer to: Chitra (art), a historic art that includes paintings, sketching with or without multiple colors Citra (drink), a lemon flavored soda sold in India in the late 1980s and early '90
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 0x2373ef188a56512fdef8be409c2d25948423c89f75be7700de943e63712d16a5. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/926e5f5c-6a22-4c65-9d6c-4a41526210fd.json and https://artists.proofprofile.net/proofs/artist/926e5f5c-6a22-4c65-9d6c-4a41526210fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).