Does PENG / 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":91898636,"chain":"robinhood","checked_at":"2026-10-18T16:07:13Z","dev":false,"expires_at":"2026-10-19T16:07:13Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"23481101213","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"ramses-v3","pool":"0x9B977d504D94CF1efBEe30531392545FA55349Ab","quote":{"address":"0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","balance":"547498086620626856093","decimals":18,"symbol":"PENG"}},"quote_share_of_supply":0.39303239400868295,"reads":[{"block":91898636,"method":"eth_blockNumber","params":[],"result_hash":"555d5198a1256c6d63fc95fa818ddecac08f59bddb7d25ba1946f1d247e45c86","slot":null},{"block":null,"method":"eth_call","params":["0x9B977d504D94CF1efBEe30531392545FA55349Ab","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x9B977d504D94CF1efBEe30531392545FA55349Ab","token1()"],"raw_result":"0x9b23573b156b52565012f5ce02cdf60afbaa70be","result_hash":"da2078997ab09b77440e0e7934ef425e11d7f8f9e15bda83b2a7fb414c57e03a","slot":null},{"block":null,"method":"eth_call","params":["0x9B977d504D94CF1efBEe30531392545FA55349Ab","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x9B977d504D94CF1efBEe30531392545FA55349Ab","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x9B977d504D94CF1efBEe30531392545FA55349Ab","factory()"],"raw_result":"0xe0c4ceb92d08ca985bb70fe0a22feb121a9854a8","result_hash":"3acd97ac868973fcda20afc787b251dff09968890029c0107e8fa1018dc5cca8","slot":null},{"block":null,"method":"eth_call","params":["0x9B977d504D94CF1efBEe30531392545FA55349Ab","tickSpacing()"],"raw_result":"200","result_hash":"cad9e1bcc89d0640e1379437b9c9a8b021e7411c515b53a15d89f8439dafedf0","slot":null},{"block":null,"method":"eth_call","params":["0xE0c4ceb92d08CA985bB70fe0a22fEb121A9854A8","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","200"],"raw_result":"0x9b977d504d94cf1efbee30531392545fa55349ab","result_hash":"91247f383418469866abbb9e857d43cd3a81dd75654f789d56b06005e2609830","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","0x9B977d504D94CF1efBEe30531392545FA55349Ab"],"raw_result":"Some(\"23481101213\")","result_hash":"c281516ed391af40f748dc6add272bf625d8fbc44ecde034e4712a382b19244c","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","symbol()"],"raw_result":"Some(\"PENG\")","result_hash":"43fb909c4a1021fec8653161f7fd24bb76ff8fcc5610173b2abb3b53f058e3b8","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","balanceOf","0x9B977d504D94CF1efBEe30531392545FA55349Ab"],"raw_result":"Some(\"547498086620626856093\")","result_hash":"be9a863abf12b5fbae2750f65f0b467690fb157a9a2cdb21d42af1af7247b4b8","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":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","symbol()"],"raw_result":"Some(\"PENG\")","result_hash":"43fb909c4a1021fec8653161f7fd24bb76ff8fcc5610173b2abb3b53f058e3b8","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","name()"],"raw_result":"Some(\"Penguin Solutions • Robinhood Token\")","result_hash":"c7bb04adbb0aa5a58c823fa4e4959604eafb1d6c1c4b2c1e8c12310091f3afc6","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","totalSupply()"],"raw_result":"Some(\"1393010080000000000000\")","result_hash":"f1fbef7ee43fdbf79e09fa90c43567907983827fd5a47862d62b5a02ab07b52f","slot":null},{"block":null,"method":"eth_call","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T15:47:33Z","name":"Penguin Solutions","official_deployments":[{"address":"0x9b23573b156B52565012F5cE02CDF60AFBaa70Be","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"PENG"},"registry_hash":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x9B977d504D94CF1efBEe30531392545FA55349Ab","ticker":"PENG","verdict":{"Verified":{"issuer":"Robinhood","ticker":"PENG"}},"version":1}

Signature

VtAMRbAhRcnGZw2cEIRLFW+DK3qHo2z1Eo996k9qlb+ZM4rMNbsiuu8gs/PuhRWtdp54Gg4taSATqqsZGjMgDQ==

API call

GET /api/attest/6cc2316b71d35ca99959d9ca6562b5587da1a746dadb9a134e08a24e9c3d88a5

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.