Siboni is a surname. Notable people with the surname include: Daniel Siboni (born 1959), French photographer Gabi Siboni (born 1957), Israeli colonel Giuseppe Siboni (1780–1839), Italian operatic ten
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 0x31ba6c98046528ab6243437e7265e4cbc3a8e72ecc20f7042b501b206254d529. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca1c7dc6-c88d-4b76-bc4b-284ed45c3b6e.json and https://artists.proofprofile.net/proofs/artist/ca1c7dc6-c88d-4b76-bc4b-284ed45c3b6e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).