Does QQQ / 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":91998744,"chain":"robinhood","checked_at":"2026-10-18T18:56:33Z","dev":false,"expires_at":"2026-10-19T18:56:33Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"148772419587","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xD60A5d14dB690B7Afad71F76B108071D7175597d","quote":{"address":"0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","balance":"1277610667624793272240","decimals":18,"symbol":"QQQ"}},"quote_share_of_supply":0.17492748605464195,"reads":[{"block":91998744,"method":"eth_blockNumber","params":[],"result_hash":"0bebf063fd821ec6a34d3d95128988860901b17a2f39eb929c719b190d0c2297","slot":null},{"block":null,"method":"eth_call","params":["0xD60A5d14dB690B7Afad71F76B108071D7175597d","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xD60A5d14dB690B7Afad71F76B108071D7175597d","token1()"],"raw_result":"0xd5f3879160bc7c32ebb4dc785f8a4f505888de68","result_hash":"9bd90eb85ea7836838fa3000d9a6c13f6bb646cc5344fd844e58a4bf85e2a67f","slot":null},{"block":null,"method":"eth_call","params":["0xD60A5d14dB690B7Afad71F76B108071D7175597d","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xD60A5d14dB690B7Afad71F76B108071D7175597d","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xD60A5d14dB690B7Afad71F76B108071D7175597d","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xD60A5d14dB690B7Afad71F76B108071D7175597d","fee()"],"raw_result":"500","result_hash":"5ac95f46dcda9e6a85f4d281cd691aea7b00846d8f8612d198d396136e9c5140","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","0x1f4"],"raw_result":"0xd60a5d14db690b7afad71f76b108071d7175597d","result_hash":"971f61425d13ef8962e1a3ac453df746e3bc4307ad682a805bf40de6ba353e23","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","0xD60A5d14dB690B7Afad71F76B108071D7175597d"],"raw_result":"Some(\"148772419587\")","result_hash":"3d5c441bfa82ec9bab97be97bca86d2ebdfcf1deeae5ee5d3603ec51d363fef9","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","symbol()"],"raw_result":"Some(\"QQQ\")","result_hash":"3484733d4c72ec171630e7c55163bd00f2a50a818074ea0bde42a199df42cadb","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","balanceOf","0xD60A5d14dB690B7Afad71F76B108071D7175597d"],"raw_result":"Some(\"1277610667624793272240\")","result_hash":"f41573a42873d529b6987382e4a274f415a264cdff4070ce29eb8646f3e10e91","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(\"696496200347174\")","result_hash":"c89de63b57cbd2df29547c452103566aa72dd3f4abac92a6142add18e0bbbedd","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","symbol()"],"raw_result":"Some(\"QQQ\")","result_hash":"3484733d4c72ec171630e7c55163bd00f2a50a818074ea0bde42a199df42cadb","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","name()"],"raw_result":"Some(\"Invesco QQQ • Robinhood Token\")","result_hash":"d3667227e735e48c9eceb564152fba2b7f5ddfa823fb19e531daf7024b9b03f0","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","totalSupply()"],"raw_result":"Some(\"7303658769930000000000\")","result_hash":"05e8ed57dc7d4ec24cac3126b90ffabfbc4da6f3cec208f0cc943e3dd4462673","slot":null},{"block":null,"method":"eth_call","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","uiMultiplier()"],"raw_result":"1000700791241405425","result_hash":"b37529cae6d6cc0e9a51d27ebcccf454ac68f582f8c74195dbfd6e7170317a93","slot":null},{"block":null,"method":"eth_getCode","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T18:54:09Z","name":"Invesco QQQ","official_deployments":[{"address":"0xD5f3879160bc7c32ebb4dC785F8a4F505888de68","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"QQQ"},"registry_hash":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xD60A5d14dB690B7Afad71F76B108071D7175597d","ticker":"QQQ","verdict":{"Verified":{"issuer":"Robinhood","ticker":"QQQ"}},"version":1}

Signature

6Z7a9iAFKZSx6FO+LBp4nWMgSnOuRcUlKIYDDI1KlPznabQgFrrt6fgxgJUjc6FvFOhTAlY60+jKCyG2d9OpCA==

API call

GET /api/attest/500f3c1e9ae8ad2a01dabf16937e02351f3b83c03014d8624158dfd34a1a36b2

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.