Does PFE / 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":92062926,"chain":"robinhood","checked_at":"2026-10-18T20:45:19Z","dev":false,"expires_at":"2026-10-19T20:45:19Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"20607016698","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","quote":{"address":"0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","balance":"613168533239609827949","decimals":18,"symbol":"PFE"}},"quote_share_of_supply":0.06674181746017664,"reads":[{"block":92062926,"method":"eth_blockNumber","params":[],"result_hash":"c046b44bb53ef149ca166151af7899bc9902e43272446fafa86b92c0092ef493","slot":null},{"block":null,"method":"eth_call","params":["0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","token1()"],"raw_result":"0x7066a64c24e4206cd62e83bf198c1e7eb361f51e","result_hash":"d2a85fc2dfb11d84c03293d3f25780374e0b7faaca9a7908ecec4eca02af9b40","slot":null},{"block":null,"method":"eth_call","params":["0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","0xbb8"],"raw_result":"0xc7d573fcda6d2107c97fb582ae18411f9db32e7f","result_hash":"14c863bbf2ef2a159a3f7b2318712fb274d707072246257cff4499f9fdc30240","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","0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f"],"raw_result":"Some(\"20607016698\")","result_hash":"b32809572e9dfe2416e5783a08a5133d2818dfca40549bebc8122b0b743fd4d1","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","symbol()"],"raw_result":"Some(\"PFE\")","result_hash":"693d364f57f51ea431da024e95e0b6d3679c591ed747a286c1a491371961ac54","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","balanceOf","0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f"],"raw_result":"Some(\"613168533239609827949\")","result_hash":"f720d53f359a8263bf69fc68462d1c5a1ba0e1cead41061ba83bd565894c66a9","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(\"695805923423211\")","result_hash":"04b5c608a15eeb8fdd54219ac94a387763c1fffb8217e797339aeda6cd54a702","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","symbol()"],"raw_result":"Some(\"PFE\")","result_hash":"693d364f57f51ea431da024e95e0b6d3679c591ed747a286c1a491371961ac54","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","name()"],"raw_result":"Some(\"Pfizer • Robinhood Token\")","result_hash":"b112992617583124b4fea70a6deae908f5bb4f4be95695eafb22fbe462d389d5","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","totalSupply()"],"raw_result":"Some(\"9187171650000000000000\")","result_hash":"f0492fe2d06c2fdaf8403257dacf0ac554aadeab80010a1f66a8a7b89bc8cc8b","slot":null},{"block":null,"method":"eth_call","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T20:40:19Z","name":"Pfizer","official_deployments":[{"address":"0x7066A64c24e4206CD62E83bf198c1E7EB361F51e","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"PFE"},"registry_hash":"232d0be2eda56472709e0cf69b424df4c8dd39a27138a34cf3d57c8f428c0f9e","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xC7d573Fcda6D2107C97fb582ae18411F9Db32E7f","ticker":"PFE","verdict":{"Verified":{"issuer":"Robinhood","ticker":"PFE"}},"version":1}

Signature

JYyPA/nirwi/6qDQ4ARwpEbKRRwDOwhgexoqUK3OFCgmMEgRtmOB9YUEBT7HqWyCN4uilqqY3xMPj7Jn7fEwDw==

API call

GET /api/attest/3aeb9148ce74ab9232524af7c5bcab36437442f34683d574dceb3dad9297d362

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.