Sze or SZE may refer to: People Alfred Sao-ke Sze (1877–1958), Chinese diplomat Arthur Sze (born 1950, American poet Chris Sze (born 2003), English footballer David Sze (born 1966), American busine
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 0x28de7464eff9c4459d847cc90d5294f81c3098bb5079433c50e1df9db7239af4. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2144ef1-abba-4903-b2da-c3dd85b1233b.json and https://artists.proofprofile.net/proofs/artist/f2144ef1-abba-4903-b2da-c3dd85b1233b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).