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":26221388,"chain":"ethereum","checked_at":"2026-10-18T18:57:53Z","dev":false,"expires_at":"2026-10-19T18:57:53Z","issuer":"Ondo","pool":{"base":{"address":"0x2D1F7226Bd1F780AF6B9A49DCC0aE00E8Df4bDEE","balance":"585816417939919123564","decimals":18,"symbol":"NVDAon"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"10666911622","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":0.007018945436670419,"reads":[{"block":26221388,"method":"eth_blockNumber","params":[],"result_hash":"fc884e840f9d9c8939176e251c495a2a0d3280e4d0107c589a3534023be1de1a","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(\"585816417939919123564\")","result_hash":"ba138dd8d6134b80eca8ee9a971fddef60094fa47fdf70fc49414be4faf14b73","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(\"10666911622\")","result_hash":"c180ed59c66609670a002e481f557fbb823475115b040d11ffae19e000ece992","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(\"48196581084207226\")","result_hash":"1e11dc71df72e882d08113d182ed39a424f8ffd45ccf7790f89d0e501b9c7bb8","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(\"83462170097423249824155\")","result_hash":"454a92c6af9fce4c5d8882ce9f8b708ea1b4a89c947174d9439bc8efa445f968","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":"2026-10-18T18:54:11Z","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":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xc9b4bC7C15423FCFe6B75aB5118bA773945A3A46","ticker":"NVDA","verdict":{"Verified":{"issuer":"Ondo","ticker":"NVDA"}},"version":1}

Signature

CWdFFtklZP0VnCRnx2nCPq4CxPLUTv4yp0Io1by9sYAS6rZgNzV78JJknaGRASt3uj5NdKLrKggnzgKP8ZLTCA==

API call

GET /api/attest/574305d112bd9129183c46bb906e90b9c2dffd14b68d763cff565a945a6922ae

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.