Angi (formerly Angie's List) is an American home services website owned by Angi Inc., a publicly traded subsidiary of IAC. Founded in 1995 by Angie Hicks and William S. Oesterle, it allows users to se
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 0xed942a396942d2d99fe8205c11b254f1c0ee41b221f76b2358cfc2b3075780ff. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51e1cfbe-1587-4e36-9ea4-772ed2917de5.json and https://artists.proofprofile.net/proofs/artist/51e1cfbe-1587-4e36-9ea4-772ed2917de5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).