Does NVDAon / 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":26218664,"chain":"ethereum","checked_at":"2026-10-18T09:51:23Z","dev":false,"expires_at":"2026-10-19T09:51:23Z","issuer":"Ondo","pool":{"base":{"address":"0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","balance":"558944873291982793723","decimals":18,"symbol":"NVDAon"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"16441500371","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":0.00669408551859924,"reads":[{"block":26218664,"method":"eth_blockNumber","params":[],"result_hash":"a0aa94d7bcad1a445606c9ce057140fd1b551c8bc2d29666f5cfa67843554c99","slot":null},{"block":null,"method":"eth_call","params":["0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","token0()"],"raw_result":"0x2d1f7226bd1f780af6b9a49dcc0ae00e8df4bdee","result_hash":"ee549f15d13a7be7456a014663d1f9ccea242fc3536da66fcb0900903712ebbb","slot":null},{"block":null,"method":"eth_call","params":["0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","token1()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xbb8"],"raw_result":"0xc9b4bc7c15423fcfe6b75ab5118ba773945a3a46","result_hash":"90a5b126eb3db7cb2907f7a1b0235fefd8492f9bfb47c130c94f195beb1be209","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","symbol()"],"raw_result":"Some(\"NVDAon\")","result_hash":"46c43db2f5276b496d913fac27ac99eb51d6b037736cff400a31e742440484fd","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","balanceOf","0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46"],"raw_result":"Some(\"558944873291982793723\")","result_hash":"534cfb28886025098eab101168941c21d5aa9b1115d38cfc681d3a886d9a16d0","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","0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46"],"raw_result":"Some(\"16441500371\")","result_hash":"5c2fcb589e94aed120ff9e9de67e8c05514bcfffd188b85b8246e278e96a32de","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(\"48199347489310342\")","result_hash":"2faba574bf1df01adb155d67639e4e0520e85791b76e12fb9681dabfca0dcc7b","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","symbol()"],"raw_result":"Some(\"NVDAon\")","result_hash":"46c43db2f5276b496d913fac27ac99eb51d6b037736cff400a31e742440484fd","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","name()"],"raw_result":"Some(\"NVIDIA (Ondo Tokenized)\")","result_hash":"cbfbccf105c436b16e881eff4a8ca524fd0008d69f2f09914242b75219061f2e","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","totalSupply()"],"raw_result":"Some(\"83498316796069825942125\")","result_hash":"eb95323245700d751016123887f11757612085ac30c2050562ea7f02017ea80c","slot":null},{"block":null,"method":"eth_getCode","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T09:47:35Z","name":"NVIDIA (Ondo Tokenized)","official_deployments":[{"address":"0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","network":"Ethereum"},{"address":"0xA9eE28C80f960B889dFbd1902055218cBa016F75","network":"BNB Chain"},{"address":"gEGtLTPNQ7jcg25zTetkbmF7teoDLcrfTnQfmn2ondo","network":"Solana"},{"address":"0xB989ad9b91886b1Aaed8DaADb26F028b29b40945","network":"HyperEVM"}],"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":"NVDA"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","ticker":"NVDA","verdict":{"Verified":{"issuer":"Ondo","ticker":"NVDA"}},"version":1}

Signature

iLApY+6mxc0ukHflOCX2e8Znx1XMc2a70mzAMdOhsSxzQX/ucGXDmNc+FLZXQX/xjMMKiJN86wTHSJH9wJI0Ag==

API call

GET /api/attest/abe24d60b79382858394bf9976625afc269ee6648942be71909a162bc14b2534

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.