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":91902047,"chain":"robinhood","checked_at":"2026-10-18T16:12:56Z","dev":false,"expires_at":"2026-10-19T16:12:56Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"183289","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v2","pool":"0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","quote":{"address":"0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","balance":"864121574573568","decimals":18,"symbol":"NVDA"}},"quote_share_of_supply":9.585581373075198e-9,"reads":[{"block":91902047,"method":"eth_blockNumber","params":[],"result_hash":"2e24462854c75d8836bbfea6306140a939c2f2ea653a9f3548c2227781cbd07e","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(\"183289\")","result_hash":"af3bc8a0e8ce47a12f193bf13a34ee459c91a2d894a399f77394a1a278080ab4","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(\"864121574573568\")","result_hash":"6ab2035628030673060eca00ad9dddb4a67bd33d7c597328740fa8dca7101d59","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(\"696830211378076\")","result_hash":"8842084c4dbae3b6381eaae59bbc10fa07977d41e52eabb154c57a2de76ce8e1","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(\"90148061024320000000000\")","result_hash":"383fa8ab5095698afa27dd9ee3d17aff99f82a8ac4bf884b0885030b16a6fe8b","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":"2026-10-18T15:47:33Z","name":"NVIDIA","official_deployments":[{"address":"0xd0601CE157Db5bdC3162BbaC2a2C8aF5320D9EEC","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"NVDA"},"registry_hash":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xeE6F200063a53Fe9450578d99c0F8eAD4952c97a","ticker":"NVDA","verdict":{"Verified":{"issuer":"Robinhood","ticker":"NVDA"}},"version":1}

Signature

9nk0AwjGoOYNhBq/gnpDSas5kOn7kSvIcOu9pGlJwCS5d2HhH39A/dFow4+qV7e3uwB8/NmRiSiMrPNPXpGEAA==

API call

GET /api/attest/a847447c16661474c9c2e49f1d77de769dfa99f29a9bc3f8ada3bf1301f17073

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.