USDG/IBM

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":76127600,"chain":"RobinhoodChain","checked_at":"2026-09-30T01:36:52Z","dev":false,"expires_at":"2026-10-01T01:36:52Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"51969957314","decimals":6,"symbol":"USDG"},"chain":"RobinhoodChain","dex":"uniswap-v3","pool":"0x8cD848ce18b829C5c769AFf27164078bB52e0E97","quote":{"address":"0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","balance":"899398809537388786711","decimals":18,"symbol":"IBM"}},"quote_share_of_supply":null,"reads":[{"block":null,"method":"eth_getCode","params":["0x8cD848ce18b829C5c769AFf27164078bB52e0E97","latest"],"result_hash":"044a70147da0ac74b950a9c48c4a27bccb3ca24b6f011ff160ab1049b4a27ca2","slot":null},{"block":76127600,"method":"eth_blockNumber","params":[],"result_hash":"851a2a1aed89dc58ccd1dae80bb75b1265802c7212a2a6f27bd2b939cfdc2ac3","slot":null},{"block":null,"method":"eth_call","params":["0x8cD848ce18b829C5c769AFf27164078bB52e0E97","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x8cD848ce18b829C5c769AFf27164078bB52e0E97","token1()"],"raw_result":"0x980dcf6766fa79f5cf0c4aadb3ab477ff15a9619","result_hash":"e37ee6f08c4fa9f7bb6fe95fa3a4b8cd1b21065d808b83c5b5922164a0885080","slot":null},{"block":null,"method":"eth_call","params":["0x8cD848ce18b829C5c769AFf27164078bB52e0E97","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x8cD848ce18b829C5c769AFf27164078bB52e0E97","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x8cD848ce18b829C5c769AFf27164078bB52e0E97","factory()"],"raw_result":"Some(0x1f7d7550b1b028f7571e69a784071f0205fd2efa)","result_hash":"3a5325de1b5dc50662a9e2ec44d8428ded4306d2bd46195f62299474690e30aa","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","0x8cD848ce18b829C5c769AFf27164078bB52e0E97"],"raw_result":"Some(\"51969957314\")","result_hash":"ca13d76a354be734a6ebe29f2b7277732a70af3dfc405c04f0c3b068b93c1670","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","symbol()"],"raw_result":"Some(\"IBM\")","result_hash":"f5eeec8d7a4faf57bea44b9e434435d4849f28d5a1782f44ec5b9ed63b266ddc","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","balanceOf","0x8cD848ce18b829C5c769AFf27164078bB52e0E97"],"raw_result":"Some(\"899398809537388786711\")","result_hash":"9aa1ae1ba3c7cc199b586abe53b8ac6a198fed954df3da0878e7fb120df8b6a3","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(\"683672521468232\")","result_hash":"cba5af16840d43ab6c9804af71756ce76d41729f6c641ce6951775031869faeb","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","symbol()"],"raw_result":"Some(\"IBM\")","result_hash":"f5eeec8d7a4faf57bea44b9e434435d4849f28d5a1782f44ec5b9ed63b266ddc","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","name()"],"raw_result":"Some(\"IBM • Robinhood Token\")","result_hash":"1fb70cc0027350843ab5cc4c1712dfff3a2f02f90e0c66e3f843d7a086f52911","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","totalSupply()"],"raw_result":"None","result_hash":"f2953d2931e36d0c55640f51865f8394ebe52194765d04e521017232558f871c","slot":null},{"block":null,"method":"eth_call","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"RobinhoodChain","contract":"0x980dcf6766FA79f5Cf0c4AAdb3ab477ff15a9619","decimals":18,"issuer":"Robinhood","last_checked":"2026-09-30T00:37:24Z","name":"IBM","source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"IBM"},"registry_hash":"5524ad353114ce82e4459bdb0533016e63f15d54f628b91498b20cf2b964d0de","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x8cD848ce18b829C5c769AFf27164078bB52e0E97","ticker":"IBM","verdict":{"Verified":{"issuer":"Robinhood","ticker":"IBM"}},"version":1}

Signature

vjzwB+Yi3BxXsiibGwW8GI183Uk1syp29F86AEeFPiVPa74+O+WSqSvcps/EzXLaQeyzlOZiR6SoeYWv9sLyCA==

API call

GET /api/attest/c9abc78a885eedbb45af63fa8a59719b802d429456f88585e1dd9b3cfc19b4f2

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.