Does UBERon / USDC 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":26223817,"chain":"ethereum","checked_at":"2026-10-19T03:05:07Z","dev":false,"expires_at":"2026-10-20T03:05:07Z","issuer":"Ondo","pool":{"base":{"address":"0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","balance":"14677665042105405900","decimals":18,"symbol":"UBERon"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xb97E08A69b56196E4fC088Db9fC73af43207D094","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"556108684","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":0.0012022441277095934,"reads":[{"block":26223817,"method":"eth_blockNumber","params":[],"result_hash":"df863b631a29ba2cf0d5ca7db72fe9bdec7424b4cdc28d8b612980165b587757","slot":null},{"block":null,"method":"eth_call","params":["0xb97E08A69b56196E4fC088Db9fC73af43207D094","token0()"],"raw_result":"0x5bcd8195e3ef58f677aef9ebc276b5087c027050","result_hash":"9e1b1521a21942f64992ac9009d5ee92775c2ac4ad0c385fbc22d4ed6288e098","slot":null},{"block":null,"method":"eth_call","params":["0xb97E08A69b56196E4fC088Db9fC73af43207D094","token1()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xb97E08A69b56196E4fC088Db9fC73af43207D094","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xb97E08A69b56196E4fC088Db9fC73af43207D094","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xb97E08A69b56196E4fC088Db9fC73af43207D094","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xb97E08A69b56196E4fC088Db9fC73af43207D094","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xbb8"],"raw_result":"0xb97e08a69b56196e4fc088db9fc73af43207d094","result_hash":"3070b3d0460fcb9f9400f6d4bdca18c6536c00383e98bdb489f4337292d4c12b","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","symbol()"],"raw_result":"Some(\"UBERon\")","result_hash":"60c87e2be77aec22575e9820c79b20239611f7f284f0fb10c1feb8dae4b14ca3","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","balanceOf","0xb97E08A69b56196E4fC088Db9fC73af43207D094"],"raw_result":"Some(\"14677665042105405900\")","result_hash":"3392af830d81836b97065038e508b8286372a0f0ab5276cf9e9793fbc78ec43f","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balanceOf","0xb97E08A69b56196E4fC088Db9fC73af43207D094"],"raw_result":"Some(\"556108684\")","result_hash":"cc649975228e1d5af571a85d3c493163794ef041671d939f968fc7448356bf58","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","name()"],"raw_result":"Some(\"USD Coin\")","result_hash":"fe94af15dc887a2c9df1fb0d6d276e6c586ca9d430ffeac0d05e4baee0637fd1","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","totalSupply()"],"raw_result":"Some(\"48173764062326755\")","result_hash":"f586ab544ef0a23bb4da3d6f41ae5519530e17b55b1076a0b91994ecf8856355","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","symbol()"],"raw_result":"Some(\"UBERon\")","result_hash":"60c87e2be77aec22575e9820c79b20239611f7f284f0fb10c1feb8dae4b14ca3","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","name()"],"raw_result":"Some(\"Uber (Ondo Tokenized)\")","result_hash":"3c3e94c1d10acdc522f222e5b54da12d13c2a1643d69d5ba328d4d9b08621dcf","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","totalSupply()"],"raw_result":"Some(\"12208556235635738009247\")","result_hash":"b67ea66968a77b826b439de65ea0473eae57fa6e013f4060283e8a9184829079","slot":null},{"block":null,"method":"eth_getCode","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T20:40:22Z","name":"Uber (Ondo Tokenized)","official_deployments":[{"address":"0x5Bcd8195E3Ef58f677aeF9eBC276B5087c027050","network":"Ethereum"},{"address":"0xDE9D6036FCA870f7efc5A82722Ae694c371Ac909","network":"BNB Chain"},{"address":"KJNeFW3kk3ycPjXpC6cbuyckjeYHacc2ekhtAi5ondo","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":"UBER"},"registry_hash":"0bd20861acb250fc115ebe98f0dbbb7c686b15c772a071c9020aa5154f2d195f","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xb97E08A69b56196E4fC088Db9fC73af43207D094","ticker":"UBER","verdict":{"Verified":{"issuer":"Ondo","ticker":"UBER"}},"version":1}

Signature

TSzsefHRdZLTUE9ai5pdStvV1jJq6CijVLdE0QHwJzKhY8B0iN3pG5/dMAV6u8c6+G7nZETIGyHv7uF8/douAQ==

API call

GET /api/attest/7e6342719fd242b475f6caba795347bfdb7962f4efa25506849a0d1789ca8cb8

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.