Does QUBT / 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":92004070,"chain":"robinhood","checked_at":"2026-10-18T19:05:36Z","dev":false,"expires_at":"2026-10-19T19:05:36Z","issuer":"Robinhood","pool":{"base":{"address":"0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","balance":"10660860698356365074743","decimals":18,"symbol":"QUBT"},"chain":"robinhood","dex":"uniswap-v3","pool":"0x227Bbce9A81B3694b01754298a983Be3F9E44A93","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"4359166344","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.3718753557072579,"reads":[{"block":92004070,"method":"eth_blockNumber","params":[],"result_hash":"394f0eabc8dd264d8aba3261cf2e91fcf5ef49d61008965200a68d399156d48b","slot":null},{"block":null,"method":"eth_call","params":["0x227Bbce9A81B3694b01754298a983Be3F9E44A93","token0()"],"raw_result":"0x59818904ab4ce163b3ce4ffb64f2d6ca02c434b4","result_hash":"242bf153652eac58e7985c5d100e262a4a8cb80de3bec67565a0b30ca99652e6","slot":null},{"block":null,"method":"eth_call","params":["0x227Bbce9A81B3694b01754298a983Be3F9E44A93","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x227Bbce9A81B3694b01754298a983Be3F9E44A93","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x227Bbce9A81B3694b01754298a983Be3F9E44A93","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x227Bbce9A81B3694b01754298a983Be3F9E44A93","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0x227Bbce9A81B3694b01754298a983Be3F9E44A93","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xbb8"],"raw_result":"0x227bbce9a81b3694b01754298a983be3f9e44a93","result_hash":"d24945e060d83690476ca6e1c2d529d44c52621cb8826f7cee4d589890d20d24","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","symbol()"],"raw_result":"Some(\"QUBT\")","result_hash":"b7a9d2b897c0ed65e14460f2a0391248c783d6b0ee269665a88bef72ab31d2e3","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","balanceOf","0x227Bbce9A81B3694b01754298a983Be3F9E44A93"],"raw_result":"Some(\"10660860698356365074743\")","result_hash":"43a8d48fd9989a3cb55adff776881b7d15a37f9e8c333424a5bec3801aa15864","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","0x227Bbce9A81B3694b01754298a983Be3F9E44A93"],"raw_result":"Some(\"4359166344\")","result_hash":"2d53ac7313da45fd6940f51357779f30f8412d09c819a5b8215a53a3d48c7d72","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(\"696496200347174\")","result_hash":"c89de63b57cbd2df29547c452103566aa72dd3f4abac92a6142add18e0bbbedd","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","symbol()"],"raw_result":"Some(\"QUBT\")","result_hash":"b7a9d2b897c0ed65e14460f2a0391248c783d6b0ee269665a88bef72ab31d2e3","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","name()"],"raw_result":"Some(\"Quantum Computing • Robinhood Token\")","result_hash":"2db94c898446a8900bd0e8dab6bce11e15da73bc3d82b50e9d6788c540302b8a","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","totalSupply()"],"raw_result":"Some(\"28667833280000000000000\")","result_hash":"8e696a3effd83ab62a1a323ebf02ad8aac4021caa0dbf85db294c99674e745ad","slot":null},{"block":null,"method":"eth_call","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T18:54:09Z","name":"Quantum Computing","official_deployments":[{"address":"0x59818904ab4cE163b3cE4FfB64f2D6Ca02c434B4","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"QUBT"},"registry_hash":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x227Bbce9A81B3694b01754298a983Be3F9E44A93","ticker":"QUBT","verdict":{"Verified":{"issuer":"Robinhood","ticker":"QUBT"}},"version":1}

Signature

OwE++3w8qr71DyoU8ftkPYO179T6IyUPQh1X8vMrXP0OyPygJzL/RT2JKdRUqmdjxPz7sX+krZ5hgq+uOZiZAg==

API call

GET /api/attest/d316c0e7dddec09aa8479150defdbcbf3d5ad63e94d8172f241cb6b215284041

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.