Does MCDon / 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":128578285,"chain":"bnb","checked_at":"2026-10-19T15:28:53Z","dev":false,"expires_at":"2026-10-20T15:28:53Z","issuer":"Ondo","pool":{"base":{"address":"0x55d398326f99059fF775485246999027B3197955","balance":"790350165799913723210","decimals":18,"symbol":"USDT"},"chain":"bnb","dex":"pancake-v3","pool":"0x22E660655F106C12ae737999F43323C5962BC8Fe","quote":{"address":"0x995ADd4bA29a628A57930a8a185c62cA044eC090","balance":"3452477442608769697","decimals":18,"symbol":"MCDon"}},"quote_share_of_supply":0.0035075073476340856,"reads":[{"block":128578285,"method":"eth_blockNumber","params":[],"result_hash":"763819e45d8132d44ae7a9b3648344f1b0ab8f95c0e7902488dda43cf22ad2f7","slot":null},{"block":null,"method":"eth_call","params":["0x22E660655F106C12ae737999F43323C5962BC8Fe","token0()"],"raw_result":"0x55d398326f99059ff775485246999027b3197955","result_hash":"66f63b72a2cc2125a9e796877d8894f3c7efb1d98419d7f1f9800b08f25cdc61","slot":null},{"block":null,"method":"eth_call","params":["0x22E660655F106C12ae737999F43323C5962BC8Fe","token1()"],"raw_result":"0x995add4ba29a628a57930a8a185c62ca044ec090","result_hash":"51241357437c88218859522b15541fc4546fb2af30aa57d3b5ea72cc9c65e146","slot":null},{"block":null,"method":"eth_call","params":["0x22E660655F106C12ae737999F43323C5962BC8Fe","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x22E660655F106C12ae737999F43323C5962BC8Fe","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x22E660655F106C12ae737999F43323C5962BC8Fe","factory()"],"raw_result":"0x0bfbcf9fa4f9c56b0f40a671ad40e0805a091865","result_hash":"2e3d0bedb6ff98db8ecf6c7b57f2028219517abe46f0f5212ff489a2c45cafbd","slot":null},{"block":null,"method":"eth_call","params":["0x22E660655F106C12ae737999F43323C5962BC8Fe","fee()"],"raw_result":"2500","result_hash":"c470156de4cb3620b0749c19d984d0666924d83d0ec37998dd6b637a87a2ec3b","slot":null},{"block":null,"method":"eth_call","params":["0x0BFbCF9fa4f9C56B0F40a671Ad40E0805A091865","getPool","0x55d398326f99059fF775485246999027B3197955","0x995ADd4bA29a628A57930a8a185c62cA044eC090","0x9c4"],"raw_result":"0x22e660655f106c12ae737999f43323c5962bc8fe","result_hash":"dd059bc7788a64ba57e94aacacee09ae198875be7dee9a895d0a348ed5660229","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","0x22E660655F106C12ae737999F43323C5962BC8Fe"],"raw_result":"Some(\"790350165799913723210\")","result_hash":"63f796fba3d9e9f96ebb4e81dbed1793eec2a4d440c5939bb5c0cc98beb8d23b","slot":null},{"block":null,"method":"eth_call","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","symbol()"],"raw_result":"Some(\"MCDon\")","result_hash":"0aa9321064fba91cf28d0e7d4dd6175da729bd43f5e65438824913b6ee30049f","slot":null},{"block":null,"method":"eth_call","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","balanceOf","0x22E660655F106C12ae737999F43323C5962BC8Fe"],"raw_result":"Some(\"3452477442608769697\")","result_hash":"c9f378baf7f493b1c24ad1eb409b43b6acbccbab82c36310a9e291903f122724","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":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","symbol()"],"raw_result":"Some(\"MCDon\")","result_hash":"0aa9321064fba91cf28d0e7d4dd6175da729bd43f5e65438824913b6ee30049f","slot":null},{"block":null,"method":"eth_call","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","name()"],"raw_result":"Some(\"McDonald's (Ondo Tokenized)\")","result_hash":"46d2bcc1c6d21dce662532c5bbcb224fe86e9b73b4234b1c5ae6c4afd27000e8","slot":null},{"block":null,"method":"eth_call","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","totalSupply()"],"raw_result":"Some(\"984310822595301087651\")","result_hash":"d020e93a9c5ba8b19022a6ed3fcd6aeb06d7b45f41aa86c33219a8612504b7fc","slot":null},{"block":null,"method":"eth_getCode","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null},{"block":null,"method":"eth_getCode","params":["0x995ADd4bA29a628A57930a8a185c62cA044eC090","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null}],"registry_entry":{"chain":"bnb","contract":"0x995ADd4bA29a628A57930a8a185c62cA044eC090","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T20:40:22Z","name":"McDonald's (Ondo Tokenized)","official_deployments":[{"address":"0x4C82c8cD9a218612DCe60b156B73A36705645e3b","network":"Ethereum"},{"address":"0x995ADd4bA29a628A57930a8a185c62cA044eC090","network":"BNB Chain"},{"address":"EUbJjmDt8JA222M91bVLZs211siZ2jzbFArH9N3ondo","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":"MCD"},"registry_hash":"92e84a5097c412088157ecc6f5394b143eea965b7cf43a01187023b0d9844862","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x22E660655F106C12ae737999F43323C5962BC8Fe","ticker":"MCD","verdict":{"Verified":{"issuer":"Ondo","ticker":"MCD"}},"version":1}

Signature

J2wPo/AblEPAwkXMAPkw8w2BWVpOBZQxkWOfiZaa/c/PJLD3vUzm1nwI8d14j33J0ALvl3qXQ+AsigxwReJFCA==

API call

GET /api/attest/3a83b32f6ccc1b706e48189c1c0a9f47944637f14bb1ffe1dd16a8eef9d87190

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.