Does MRNA / 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":91677904,"chain":"robinhood","checked_at":"2026-10-18T09:52:09Z","dev":false,"expires_at":"2026-10-19T09:52:09Z","issuer":"Robinhood","pool":{"base":{"address":"0x43B07D15cE533bEc5476d70C22a78a1B2B662155","balance":"477233556237651944158","decimals":18,"symbol":"MRNA"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"56012871613","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.15590176824983057,"reads":[{"block":91677904,"method":"eth_blockNumber","params":[],"result_hash":"080d4fef1d92fcaf695d7c071a0f1abbc89cfc3d19294485055e85a802309392","slot":null},{"block":null,"method":"eth_call","params":["0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","token0()"],"raw_result":"0x43b07d15ce533bec5476d70c22a78a1b2b662155","result_hash":"d6b555efe0ea0f2140f1bd2f81cc645203d236e431bbc6fe12e711d86a56688d","slot":null},{"block":null,"method":"eth_call","params":["0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x43B07D15cE533bEc5476d70C22a78a1B2B662155","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xbb8"],"raw_result":"0xb40196272a6d2eb5edf6d93bc4dc39856ad95e0e","result_hash":"542b939a8945df96cfaeeff5e56aac198bf5017aba2a7de127f916bf64b10def","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","symbol()"],"raw_result":"Some(\"MRNA\")","result_hash":"66b280a482cbfccf4456ea9595664691b6c8ed29adf6747c3f071583b792f0fc","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","balanceOf","0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E"],"raw_result":"Some(\"477233556237651944158\")","result_hash":"0219ff3773c97165c395537a38a5e4e3bd595326afe40b5812955c4013f8e115","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","0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E"],"raw_result":"Some(\"56012871613\")","result_hash":"e5db25a2a150f85d14f22b453e719655e8728293c2d7f8bd030bc5d40f9722b0","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(\"696510571472896\")","result_hash":"3bf47cc44e79235c2a4786a9e16c733cbbc4aa81b60a1a84187551f9e56b0257","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","symbol()"],"raw_result":"Some(\"MRNA\")","result_hash":"66b280a482cbfccf4456ea9595664691b6c8ed29adf6747c3f071583b792f0fc","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","name()"],"raw_result":"Some(\"Moderna • Robinhood Token\")","result_hash":"ead20aec0fc5d2cba8fa7d3b5de03b3179769f81daaa1afef4febb7a62e662d6","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","totalSupply()"],"raw_result":"Some(\"3061117020000000000000\")","result_hash":"d215f736106da3507e5afbc437882ae03688626195616db03027b7780d77b75f","slot":null},{"block":null,"method":"eth_call","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x43B07D15cE533bEc5476d70C22a78a1B2B662155","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x43B07D15cE533bEc5476d70C22a78a1B2B662155","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T09:47:33Z","name":"Moderna","official_deployments":[{"address":"0x43B07D15cE533bEc5476d70C22a78a1B2B662155","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"MRNA"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xB40196272A6d2EB5edF6d93bc4DC39856AD95E0E","ticker":"MRNA","verdict":{"Verified":{"issuer":"Robinhood","ticker":"MRNA"}},"version":1}

Signature

0oeIYT9Vg/XsUPW7c/joh+nOjYfziykZcmUAUicJTTQPsUkije465yMrDHo2p5GUVr2O3u5OpeCaVygXx9shBw==

API call

GET /api/attest/d0b720f88f403625ae81e87fa7e0aecd2f8e2de1c36fe666cfe152a300f1c97c

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.