Xia (Hsia in Wade–Giles) may refer to: Chinese history Xia dynasty (c. 2070 – c. 1600 BC), the first orthodox dynasty in Chinese history Xia (Sixteen Kingdoms) (407–431), a Xiongnu-led dynasty Xia
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 0x0736f88f8ced8152cceb31976496be14292953cfcfc8c38f9b9b97c6e779bead. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f0423a7-56f6-4bbd-b249-28b805e9d876.json and https://artists.proofprofile.net/proofs/artist/6f0423a7-56f6-4bbd-b249-28b805e9d876.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).