Does NVDA / USDG 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":92504275,"chain":"robinhood","checked_at":"2026-10-19T09:18:33Z","dev":false,"expires_at":"2026-10-20T09:18:33Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"185585","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v2","pool":"0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","quote":{"address":"0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","balance":"853462751427523","decimals":18,"symbol":"NVDA"}},"quote_share_of_supply":9.675466376474e-9,"reads":[{"block":92504275,"method":"eth_blockNumber","params":[],"result_hash":"176bc06d5b24677a663a29213f864e206634eca22372a7efda5e7b2f4201d10c","slot":null},{"block":null,"method":"eth_call","params":["0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","token1()"],"raw_result":"0xd0601ce157db5bdc3162bbac2a2c8af5320d9eec","result_hash":"837593898070a9209e25b8e838227fd9a1d34f048e67360db2591dc0ee9b7688","slot":null},{"block":null,"method":"eth_call","params":["0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","getReserves()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","factory()"],"raw_result":"0x8bceaa40b9acdfaedf85adf4ff01f5ad6517937f","result_hash":"f3cafb6212b287256362b492b0c46db27c981c4b5bdefad77765d1c9f1ec701c","slot":null},{"block":null,"method":"eth_call","params":["0x8bcEaA40B9AcdfAedF85AdF4FF01F5Ad6517937f","getPair","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC"],"raw_result":"0xee6f200063a53fe9450578d99c0f8ead4952c97a","result_hash":"7e55cdeafb1b2a7d04bfc6cfcab0b27b730074c24b854dc7ccc57adaf68c47d3","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","symbol()"],"raw_result":"Some(\"USDG\")","result_hash":"5cbfd9547b12ffd28d96e5f55c97290c4f230a8d7ad7bbe91dc15f2e61c1a3c5","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balanceOf","0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a"],"raw_result":"Some(\"185585\")","result_hash":"63da02571513c99ca9c2d09abcb06023a69a6ef413a611804683533dfcde771f","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","symbol()"],"raw_result":"Some(\"NVDA\")","result_hash":"021d1642ab9caf5c93ff501b70a3d5285343a63f3b632bcbe7daed2fdac7ebfb","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","balanceOf","0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a"],"raw_result":"Some(\"853462751427523\")","result_hash":"6fc5b5f31ab2b4f3578852aa8fd78673907187bb252a32bed01f932b6bc9a686","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","symbol()"],"raw_result":"Some(\"USDG\")","result_hash":"5cbfd9547b12ffd28d96e5f55c97290c4f230a8d7ad7bbe91dc15f2e61c1a3c5","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","name()"],"raw_result":"Some(\"Global Dollar\")","result_hash":"e34c795a5a7df6a2269bde7247321204357731d7742ef5974b04eb6899db8b11","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","totalSupply()"],"raw_result":"Some(\"697671212896891\")","result_hash":"02e0f47a61d7f78050dba5034b48bcdc0c35fb434669ff8de67c3d4237cee20d","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","symbol()"],"raw_result":"Some(\"NVDA\")","result_hash":"021d1642ab9caf5c93ff501b70a3d5285343a63f3b632bcbe7daed2fdac7ebfb","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","name()"],"raw_result":"Some(\"NVIDIA • Robinhood Token\")","result_hash":"164300b6b2737c6d4c2f7641a7df85a5a7adae8429019a4b66cdf2e8e5fe57c6","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","totalSupply()"],"raw_result":"Some(\"88208952232290000000000\")","result_hash":"cdc063ac6d03c53f6f9ed72266ca87f3aacd6de40347e9127a22866bc671e8cc","slot":null},{"block":null,"method":"eth_call","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","uiMultiplier()"],"raw_result":"1000775159164630595","result_hash":"52e5ec7fbc2c3245d93278c80d04f4f9d203a2a2284a006b4b2e708b84182d87","slot":null},{"block":null,"method":"eth_getCode","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-19T08:40:19Z","name":"NVIDIA","official_deployments":[{"address":"0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"NVDA"},"registry_hash":"cae30e4647e421306c11bce2b38fdd359eeecbb2567d393bf8b2a8e3d38c56d5","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","ticker":"NVDA","verdict":{"Verified":{"issuer":"Robinhood","ticker":"NVDA"}},"version":1}

Signature

H5xMCD3uiqTPjYisZ9+5E+PcS/xRl4XNRkZoawVdH/iBQMoiHq8jFVnXjfi90h99iRsulsMT8QPv9einPJL2DQ==

API call

GET /api/attest/fd420360b044aadf7ee511a2b1740f03ae3ef70e80bc2fc4406e06d8dd6e22a2

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.