Xero may refer to: Xero (band), an Australian punk band Xero (company), a New Zealand financial software company Xero (film), an experimental 2010 German film Xero (Linkin Park), an early name for th
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 0x16efc5f0d55dfc3218654b2c8705fe53b3aa2cfd3fee85ae27c6ed0223d63783. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de6addb2-a1f7-4cf4-ae43-c40dab7e670f.json and https://artists.proofprofile.net/proofs/artist/de6addb2-a1f7-4cf4-ae43-c40dab7e670f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).