Does BA / 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":91898944,"chain":"robinhood","checked_at":"2026-10-18T16:07:44Z","dev":false,"expires_at":"2026-10-19T16:07:44Z","issuer":"Robinhood","pool":{"base":{"address":"0x4D21483a44Bf67a86b77E3dA301411880797D452","balance":"318364902000295317716","decimals":18,"symbol":"BA"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"12779026145","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.3379285738944827,"reads":[{"block":91898944,"method":"eth_blockNumber","params":[],"result_hash":"febfa582e97e483a98ac11d590900a2e0149ffc96056f22d375cd453c07624d4","slot":null},{"block":null,"method":"eth_call","params":["0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","token0()"],"raw_result":"0x4d21483a44bf67a86b77e3da301411880797d452","result_hash":"ed4ed0c4c7658e5ccdac565ef664e7b35e951f1e6cc02a9c260936f03ee7045a","slot":null},{"block":null,"method":"eth_call","params":["0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x4D21483a44Bf67a86b77E3dA301411880797D452","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xbb8"],"raw_result":"0xc6517047b189c72d3baa9ef37d1d28f27a63638a","result_hash":"97fa0cc42b42cb27b6b1f4fa42363652850975e8bc047afde621aa27f2dcc091","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","symbol()"],"raw_result":"Some(\"BA\")","result_hash":"fa8ab20a23a6c36492dc9dd23cb660bc3ec97b040322349e33351005d3342efa","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","balanceOf","0xc6517047b189c72D3bAa9eF37D1d28F27a63638a"],"raw_result":"Some(\"318364902000295317716\")","result_hash":"c0851f86280abbf1f76ec636a47f4cafbca78a2abb8ca1886c5a1902d784600e","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","0xc6517047b189c72D3bAa9eF37D1d28F27a63638a"],"raw_result":"Some(\"12779026145\")","result_hash":"b3dd3ff6f9c8ad1c8da5e7242c99225db1251f503a049e16d72535844a468143","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(\"696780276174599\")","result_hash":"c7ce061585956682a5202683b0b90c38301e136eef84dda80c269326a2d3ed55","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","symbol()"],"raw_result":"Some(\"BA\")","result_hash":"fa8ab20a23a6c36492dc9dd23cb660bc3ec97b040322349e33351005d3342efa","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","name()"],"raw_result":"Some(\"Boeing • Robinhood Token\")","result_hash":"829ff9097d60890a1731f321e9795ca061307fa3ddead598dc9dc2f6b6bfda59","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","totalSupply()"],"raw_result":"Some(\"942107080000000000000\")","result_hash":"112ecf094f0de60209f826f80e3b8a125b067f2044ca27237845521df8ff9a59","slot":null},{"block":null,"method":"eth_call","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x4D21483a44Bf67a86b77E3dA301411880797D452","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x4D21483a44Bf67a86b77E3dA301411880797D452","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T15:47:33Z","name":"Boeing","official_deployments":[{"address":"0x4D21483a44Bf67a86b77E3dA301411880797D452","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"BA"},"registry_hash":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xc6517047b189c72D3bAa9eF37D1d28F27a63638a","ticker":"BA","verdict":{"Verified":{"issuer":"Robinhood","ticker":"BA"}},"version":1}

Signature

kaZjpd1QmJkguUL6H70eivz6CY0uwywtu4BldRXS1f3ll6XEOnH5NwUJb2+K2JOkpWRisZSwmrX952J/PXG3Ag==

API call

GET /api/attest/d212415ff2f400c0ec0071b02493d0c785bb4e5683f3fcc81e4f7c23eb04ddb4

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.