Does USDon / 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":128415200,"chain":"bnb","checked_at":"2026-10-18T19:05:18Z","dev":false,"expires_at":"2026-10-19T19:05:18Z","issuer":"Ondo","pool":{"base":{"address":"0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","balance":"111945574858391671663","decimals":18,"symbol":"USDon"},"chain":"bnb","dex":"pancake-v3","pool":"0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","quote":{"address":"0x55d398326f99059fF775485246999027B3197955","balance":"93613459117555699967","decimals":18,"symbol":"USDT"}},"quote_share_of_supply":3.675036175905928e-6,"reads":[{"block":128415200,"method":"eth_blockNumber","params":[],"result_hash":"2160bc9c2576ac09e34dfcd8a13d464e66add28b6ac045dcb7a887be799fc265","slot":null},{"block":null,"method":"eth_call","params":["0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","token0()"],"raw_result":"0x1f8955e640cbd9abc3c3bb408c9e2e1f5f20dfe6","result_hash":"941b3bf3e4c76cb1167c82f156710dc873088830f8d005c67e1addd3d9d832fd","slot":null},{"block":null,"method":"eth_call","params":["0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","token1()"],"raw_result":"0x55d398326f99059ff775485246999027b3197955","result_hash":"66f63b72a2cc2125a9e796877d8894f3c7efb1d98419d7f1f9800b08f25cdc61","slot":null},{"block":null,"method":"eth_call","params":["0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","factory()"],"raw_result":"0x0bfbcf9fa4f9c56b0f40a671ad40e0805a091865","result_hash":"2e3d0bedb6ff98db8ecf6c7b57f2028219517abe46f0f5212ff489a2c45cafbd","slot":null},{"block":null,"method":"eth_call","params":["0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","fee()"],"raw_result":"2500","result_hash":"c470156de4cb3620b0749c19d984d0666924d83d0ec37998dd6b637a87a2ec3b","slot":null},{"block":null,"method":"eth_call","params":["0x0BFbCF9fa4f9C56B0F40a671Ad40E0805A091865","getPool","0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","0x55d398326f99059fF775485246999027B3197955","0x9c4"],"raw_result":"0xe9e08a7254c62c434a2ea62dd70b4df3a329f14a","result_hash":"f033189f6ff338c9721dc311e804f601b4a52e770d2dc08ec31a19c3d553f347","slot":null},{"block":null,"method":"eth_call","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","symbol()"],"raw_result":"Some(\"USDon\")","result_hash":"c1f2a7a70dafac2015c6623af748d80fa986e11cf3bc6e2c4a82dbaa3ee65186","slot":null},{"block":null,"method":"eth_call","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","balanceOf","0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a"],"raw_result":"Some(\"111945574858391671663\")","result_hash":"71caaf0e12c1ec715b3348b5cbdc8fdf33ad55bd736f09facf660c47b222c599","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","0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a"],"raw_result":"Some(\"93613459117555699967\")","result_hash":"604903f9cbc11bb2c328b28aadbd562716e6eebae0df33b7300da6c30732536c","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":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","symbol()"],"raw_result":"Some(\"USDon\")","result_hash":"c1f2a7a70dafac2015c6623af748d80fa986e11cf3bc6e2c4a82dbaa3ee65186","slot":null},{"block":null,"method":"eth_call","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","name()"],"raw_result":"Some(\"Ondo U.S. Dollar Token\")","result_hash":"3c56680ac062cb7877e9841c61b13ca3619b5451f8bc537da51b116e866a9af3","slot":null},{"block":null,"method":"eth_call","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","totalSupply()"],"raw_result":"Some(\"30461081061547953434069314\")","result_hash":"ae5850fb9ba0981cbe1d162ab6411508cfa8cdba4e9aa495f9adc2eaefabca7f","slot":null},{"block":null,"method":"eth_getCode","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","latest"],"result_hash":"5c44abfbe06f31ba695b6acd0b44005d42432099f25c1d43e94acda2bef4bb7d","slot":null},{"block":null,"method":"eth_getCode","params":["0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","latest"],"result_hash":"5c44abfbe06f31ba695b6acd0b44005d42432099f25c1d43e94acda2bef4bb7d","slot":null}],"registry_entry":{"chain":"bnb","contract":"0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T18:54:11Z","name":"Ondo U.S. Dollar Token","official_deployments":[{"address":"0xAcE8E719899F6E91831B18AE746C9A965c2119F1","network":"Ethereum"},{"address":"0x1f8955E640Cbd9abc3C3Bb408c9E2E1f5F20DfE6","network":"BNB Chain"},{"address":"ZPFtoCe7WWqG4N3ZFRccS8T9SMBeHsd1Vmgv2i7ondo","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":"USD"},"registry_hash":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xe9e08a7254C62C434A2EA62dD70B4df3a329F14a","ticker":"USD","verdict":{"Verified":{"issuer":"Ondo","ticker":"USD"}},"version":1}

Signature

Licob8x66vERE6YJ+xhDBWgNF0txIgf4WvzlYMyixDaDDdNcoZ89gK/z3geRlyOEr7vQ9mVMyDuOeCtFccuPAg==

API call

GET /api/attest/3c02845216b8f9b0b5f279a6ec534684cdd723faa7ad8dc0cc9d7de17cfbc23a

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.