Does GME / 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":92061347,"chain":"robinhood","checked_at":"2026-10-18T20:42:39Z","dev":false,"expires_at":"2026-10-19T20:42:39Z","issuer":"Robinhood","pool":{"base":{"address":"0x1b0E319c6A659F002271B69dB8A7df2F911c153E","balance":"2675818466724079995827","decimals":18,"symbol":"GME"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"57966810026","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.02348370945369278,"reads":[{"block":92061347,"method":"eth_blockNumber","params":[],"result_hash":"b51c5363b5f13a7eccd8cf42183575c10a815cc90c97b8e26a6c31ae64024184","slot":null},{"block":null,"method":"eth_call","params":["0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","token0()"],"raw_result":"0x1b0e319c6a659f002271b69db8a7df2f911c153e","result_hash":"7f260c2091af04e162421fe48174d3eee5a138d1ed4c84676249953f5831f7d8","slot":null},{"block":null,"method":"eth_call","params":["0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","fee()"],"raw_result":"500","result_hash":"5ac95f46dcda9e6a85f4d281cd691aea7b00846d8f8612d198d396136e9c5140","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x1b0E319c6A659F002271B69dB8A7df2F911c153E","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0x1f4"],"raw_result":"0xe2b46c905e12ab8e2f864e4821a4325884c1b126","result_hash":"a6f09c6773932c17f46866b53747ed00d03d9f69f2822f5b865c4e8c8d7ad3b1","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","symbol()"],"raw_result":"Some(\"GME\")","result_hash":"b5e811c6f60f96381313c3e97216848dbd5afc84841cfce6e56c7cb9e64886a3","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","balanceOf","0xE2b46c905E12Ab8E2f864e4821a4325884C1B126"],"raw_result":"Some(\"2675818466724079995827\")","result_hash":"2105f980aa1dc8e1c51511e33a786e93e0587a91816e40ed5f661c1ec8f056db","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","0xE2b46c905E12Ab8E2f864e4821a4325884C1B126"],"raw_result":"Some(\"57966810026\")","result_hash":"d68bad186c9a4e212eae1ecfbb0e9287a84d11f59d963db0f291210e8b005991","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(\"695805502673935\")","result_hash":"cf458dca04b9d847a273dd31b77fbc0eb48fed3e6a988d1761c8f1fb2f6a02c4","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","symbol()"],"raw_result":"Some(\"GME\")","result_hash":"b5e811c6f60f96381313c3e97216848dbd5afc84841cfce6e56c7cb9e64886a3","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","name()"],"raw_result":"Some(\"GameStop • Robinhood Token\")","result_hash":"8fad0f145b3a7345b1b79c395e706316edf2e778b8bfbd9103376ef11ffe9b19","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","totalSupply()"],"raw_result":"Some(\"113943602990000000000000\")","result_hash":"45335596165e2ff027a144d947d406c55585dd7ff3cde2bcbcbc1204f88f123c","slot":null},{"block":null,"method":"eth_call","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x1b0E319c6A659F002271B69dB8A7df2F911c153E","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x1b0E319c6A659F002271B69dB8A7df2F911c153E","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T20:40:19Z","name":"GameStop","official_deployments":[{"address":"0x1b0E319c6A659F002271B69dB8A7df2F911c153E","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"GME"},"registry_hash":"232d0be2eda56472709e0cf69b424df4c8dd39a27138a34cf3d57c8f428c0f9e","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xE2b46c905E12Ab8E2f864e4821a4325884C1B126","ticker":"GME","verdict":{"Verified":{"issuer":"Robinhood","ticker":"GME"}},"version":1}

Signature

L3z2CW3ZydlZYpEWMY1uuDQGMAif7x2WnzmW7CO2QB2prfX6mjwPlFQSm+Y6JrzlmcP4tyh4vTGDgIteGxqhDg==

API call

GET /api/attest/d556f6cbd3b49181ec2896ce1036dfd1e19ee8e3e60fe3c0e34350a3535a6050

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.