Does POET / 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":94842444,"chain":"robinhood","checked_at":"2026-10-22T04:39:26Z","dev":false,"expires_at":"2026-10-23T04:39:26Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"3241348","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","quote":{"address":"0xcf6B2D875361be807EAfa57458c80f28521F9333","balance":"204279634011649805152","decimals":18,"symbol":"POET"}},"quote_share_of_supply":0.11130894597162068,"reads":[{"block":94842444,"method":"eth_blockNumber","params":[],"result_hash":"73b462c9734f48ede5e4f5bda93bc8a66b670f1fde8f71a5c457a3cb5ddf46cd","slot":null},{"block":null,"method":"eth_call","params":["0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","token1()"],"raw_result":"0xcf6b2d875361be807eafa57458c80f28521f9333","result_hash":"5c01ac4022e7de947160884efd1a3dfeffc8785b41ab23eee434321ff566b050","slot":null},{"block":null,"method":"eth_call","params":["0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xcf6B2D875361be807EAfa57458c80f28521F9333","0x2710"],"raw_result":"0xa1c781ed62ac2d0283f50ff5a843647a56ddd80a","result_hash":"10ac14c96b9548c8c57a1368d40807893f9db4d4a84f2330c1e63c5ce00ec595","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","0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a"],"raw_result":"Some(\"3241348\")","result_hash":"4e37dfe069f22a8545dd90b5c0d10dc1040095d629bc20cde83b51aa3dd5ffef","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","symbol()"],"raw_result":"Some(\"POET\")","result_hash":"60af00760c5720579fa645648a3df724950bd00d68652bc68495a15605c1794b","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","balanceOf","0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a"],"raw_result":"Some(\"204279634011649805152\")","result_hash":"3d8bf01ce30f26b166da461cea38a2d3b4969bfebdd740a288dfab01abb76ca0","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(\"706307387497621\")","result_hash":"90ca3c847448bd71d707cd8c98f5707c7735fc249c2f4c24e21aa4eceeec6b7c","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","symbol()"],"raw_result":"Some(\"POET\")","result_hash":"60af00760c5720579fa645648a3df724950bd00d68652bc68495a15605c1794b","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","name()"],"raw_result":"Some(\"POET Technologies • Robinhood Token\")","result_hash":"11378a8c62491153c42f72f69e66242b619ff9490b080e016beb600b2ae03ab8","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","totalSupply()"],"raw_result":"Some(\"1835249020000000000000\")","result_hash":"18cbedeb4a64053ec87eaea6d6f5c2664ced08c7bca4f89ce83c2b3d2f869ba6","slot":null},{"block":null,"method":"eth_call","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xcf6B2D875361be807EAfa57458c80f28521F9333","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xcf6B2D875361be807EAfa57458c80f28521F9333","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-22T04:11:44Z","name":"POET Technologies","official_deployments":[{"address":"0xcf6B2D875361be807EAfa57458c80f28521F9333","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"POET"},"registry_hash":"47d1728f948a06953aa44735d9e5f418d19625b2a4515a96ed2ede4bfe0eee70","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xa1C781ed62AC2d0283f50fF5A843647a56ddd80a","ticker":"POET","verdict":{"Verified":{"issuer":"Robinhood","ticker":"POET"}},"version":1}

Signature

vD/rO1qvBUDU8yr/wADRs75PIDQRDinN6qivpCb6V/+exsVzL9ekKyh2VPNkLlJ+NY0g2g0qQTf4liQCy/M6AA==

API call

GET /api/attest/08dfc763b8650ef58f293b3c427d923822520e888f08d1ca9cd5cfffc0ee14d5

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.