Does KOon / USDT match its issuer's published contract?

QED signs a canonical JSON payload. Fetch the public key from /.well-known/qed.json, then check the signature against this payload.

Canonical JSON

{"block":128778398,"chain":"bnb","checked_at":"2026-10-20T16:30:41Z","dev":false,"expires_at":"2026-10-21T16:30:41Z","issuer":"Ondo","pool":{"base":{"address":"0x405F38B90beBF1259062CF29Da299f3398662bcb","balance":"559872592336989031","decimals":18,"symbol":"KOon"},"chain":"bnb","dex":"uniswap-v3","pool":"0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","quote":{"address":"0x55d398326f99059fF775485246999027B3197955","balance":"250964420802632733483","decimals":18,"symbol":"USDT"}},"quote_share_of_supply":0.00036543173050005676,"reads":[{"block":128778398,"method":"eth_blockNumber","params":[],"result_hash":"08650964152399b49b42303ab1bcfc133c62748fff9342a5da7442488393092f","slot":null},{"block":null,"method":"eth_call","params":["0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","token0()"],"raw_result":"0x405f38b90bebf1259062cf29da299f3398662bcb","result_hash":"9b1b17444eb4c64ee6c0bc9179ff89143c78e751ea0f4ddcc4b2edfceef15519","slot":null},{"block":null,"method":"eth_call","params":["0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","token1()"],"raw_result":"0x55d398326f99059ff775485246999027b3197955","result_hash":"66f63b72a2cc2125a9e796877d8894f3c7efb1d98419d7f1f9800b08f25cdc61","slot":null},{"block":null,"method":"eth_call","params":["0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","factory()"],"raw_result":"0xdb1d10011ad0ff90774d0c6bb92e5c5c8b4461f7","result_hash":"4b482521d7cb760d72486691996fad9e93bcdcc2309e6fc4881175fe267d7fec","slot":null},{"block":null,"method":"eth_call","params":["0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0xdB1d10011AD0Ff90774D0C6Bb92e5C5c8b4461F7","getPool","0x405F38B90beBF1259062CF29Da299f3398662bcb","0x55d398326f99059fF775485246999027B3197955","0x2710"],"raw_result":"0x529d728e0141a67d9c27ee4eecb6181c49638d6e","result_hash":"6aa02ebb5032a5d35d75a40bedac544a5de63cddfe1867fcc47f837fb92e72e6","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","symbol()"],"raw_result":"Some(\"KOon\")","result_hash":"76e1a5765a71d0ab8113a99d6ed8494376be274614d9589f385a7154ab72df4a","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","balanceOf","0x529D728E0141A67D9C27ee4eEcb6181c49638D6E"],"raw_result":"Some(\"559872592336989031\")","result_hash":"3d33bda4ac5fc938d3819174b59f3f13d093e21c4a2281aaef0220fe3d989dea","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","symbol()"],"raw_result":"Some(\"USDT\")","result_hash":"a851493323e1198c0940c2b2ca5c59e97da9c6f50f63f0c09779709ef2572f84","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","balanceOf","0x529D728E0141A67D9C27ee4eEcb6181c49638D6E"],"raw_result":"Some(\"250964420802632733483\")","result_hash":"46abca900ac68226aa2f90c0a9b094a1e2ad72af137792e372cda162c53e4cd1","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","symbol()"],"raw_result":"Some(\"USDT\")","result_hash":"a851493323e1198c0940c2b2ca5c59e97da9c6f50f63f0c09779709ef2572f84","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","name()"],"raw_result":"Some(\"Tether USD\")","result_hash":"8f7cfea6e15ea5712d4bf603e3223e8de9dfdee3c5fe9a25ec1181218bd425ad","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","totalSupply()"],"raw_result":"Some(\"9184991859520259774116723649\")","result_hash":"b5a4e3e312d5f88f7b6f5d44368633422f48dda22b217c1ece79f64edd5719c9","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","symbol()"],"raw_result":"Some(\"KOon\")","result_hash":"76e1a5765a71d0ab8113a99d6ed8494376be274614d9589f385a7154ab72df4a","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","name()"],"raw_result":"Some(\"Coca-Cola (Ondo Tokenized)\")","result_hash":"a82b51492ac219d5d9d8befaeecd2cac99aa440587cc973aa1314207945ca32b","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","totalSupply()"],"raw_result":"Some(\"1532085327048254518252\")","result_hash":"f2d97f245dfa6d908aa35ba55ab6353d2117ccd2a5d8abbc3b573f515fb29edb","slot":null},{"block":null,"method":"eth_getCode","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null},{"block":null,"method":"eth_getCode","params":["0x405F38B90beBF1259062CF29Da299f3398662bcb","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null}],"registry_entry":{"chain":"bnb","contract":"0x405F38B90beBF1259062CF29Da299f3398662bcb","decimals":null,"issuer":"Ondo","last_checked":"2026-10-19T21:40:22Z","name":"Coca-Cola (Ondo Tokenized)","official_deployments":[{"address":"0x74a03d741226f738098C35da8188E57acA50d146","network":"Ethereum"},{"address":"0x405F38B90beBF1259062CF29Da299f3398662bcb","network":"BNB Chain"},{"address":"e6G4pfFcrdKxJuZ4YXixRFfMbpMvgXG2Mjcus71ondo","network":"Solana"}],"source":"https://docs.ondo.finance/addresses.md","source_url":"https://www.dropbox.com/scl/fi/qjfxyg748mx0dwi6up86d/EXTERNAL-Ondo-GM-Tokens-Ondo-GM-Tokens.csv?rlkey=n3no1w78wrah3umsl0nr9s77i&e=2&st=spdit2q1&dl=1","ticker":"KO"},"registry_hash":"e42f41f1e0f0dc698c2f40aa64c9df099fb8b38e10dd3a1a8d6c92b85ad7aedb","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x529D728E0141A67D9C27ee4eEcb6181c49638D6E","ticker":"KO","verdict":{"Verified":{"issuer":"Ondo","ticker":"KO"}},"version":1}

Signature

Q2rsYbQd+Ia75tuskkAJikzvsOFuHrfF1QksrTtkwRcnXsJGBO6nn6/DQ78Xgse/zPikd8qa5brw+LZigGvRBA==

API call

GET /api/attest/4466ddd08bdf5f9d65ddbd3980a1b942ce07111a691cca361c3e150a640d9666

1. Fetch the public key and attestation JSON, then verify the signature with the published key.
2. Canonicalize the payload with sorted object keys and no whitespace, then verify its SHA-256 attestation id.
3. Run the API call above and compare the returned payload, serial, signer, and signature with this certificate.