Does CRCL / 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":91676539,"chain":"robinhood","checked_at":"2026-10-18T09:49:48Z","dev":false,"expires_at":"2026-10-19T09:49:48Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"903629920161","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0x654E4143e82a5824445Ade0824351C2A9ACD95a8","quote":{"address":"0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","balance":"19479294444266614516150","decimals":18,"symbol":"CRCL"}},"quote_share_of_supply":0.1738072999398608,"reads":[{"block":91676539,"method":"eth_blockNumber","params":[],"result_hash":"7148dbd23bc275a4315a6c16995b81a44e3970daa05fce61db71a7fff708de24","slot":null},{"block":null,"method":"eth_call","params":["0x654E4143e82a5824445Ade0824351C2A9ACD95a8","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x654E4143e82a5824445Ade0824351C2A9ACD95a8","token1()"],"raw_result":"0xdf0992e440dd0be65bd8439b609d6d4366bf1cb5","result_hash":"bc44ca1d75a3d1939794e3de298a02bbab716692ea8d5bf5be8c0e56fb2e402b","slot":null},{"block":null,"method":"eth_call","params":["0x654E4143e82a5824445Ade0824351C2A9ACD95a8","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x654E4143e82a5824445Ade0824351C2A9ACD95a8","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x654E4143e82a5824445Ade0824351C2A9ACD95a8","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0x654E4143e82a5824445Ade0824351C2A9ACD95a8","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","0xbb8"],"raw_result":"0x654e4143e82a5824445ade0824351c2a9acd95a8","result_hash":"7f6e464d8ecfb0a5b97275b7169f1f02690397670bc9ad0fd6e6402c7a2cde61","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","0x654E4143e82a5824445Ade0824351C2A9ACD95a8"],"raw_result":"Some(\"903629920161\")","result_hash":"1568844032b755ce4290d78f8035e646337c093b665890d1770abe539dd3b27e","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","symbol()"],"raw_result":"Some(\"CRCL\")","result_hash":"349ec607fad735855e568bfbe99bd0638807670884c320fa4b454e212fa29156","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","balanceOf","0x654E4143e82a5824445Ade0824351C2A9ACD95a8"],"raw_result":"Some(\"19479294444266614516150\")","result_hash":"cb0b3326b251ca1d29dc03c392836321b0e9a42428b24ac26928acdc3835fdd7","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(\"696510571472896\")","result_hash":"3bf47cc44e79235c2a4786a9e16c733cbbc4aa81b60a1a84187551f9e56b0257","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","symbol()"],"raw_result":"Some(\"CRCL\")","result_hash":"349ec607fad735855e568bfbe99bd0638807670884c320fa4b454e212fa29156","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","name()"],"raw_result":"Some(\"Circle Internet Group • Robinhood Token\")","result_hash":"981b0dd56bfb652f6f07df42d6221edfeb31fb4e45723bb43a3ddfd1ee579a91","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","totalSupply()"],"raw_result":"Some(\"112074086940000000000000\")","result_hash":"9797e5c1459230d1e2fc7b51d9f8195c6f77a9a8f0304c7c57e27b142ba00b35","slot":null},{"block":null,"method":"eth_call","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T09:47:33Z","name":"Circle Internet Group","official_deployments":[{"address":"0xdF0992E440dD0be65BD8439b609d6D4366bf1CB5","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"CRCL"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x654E4143e82a5824445Ade0824351C2A9ACD95a8","ticker":"CRCL","verdict":{"Verified":{"issuer":"Robinhood","ticker":"CRCL"}},"version":1}

Signature

Z6ldhGS5rDGDj+Rdg+Dcpm2MDaYSclm60xZhnxutwAKN7qA3HZOErbTZ+VmTVQFpp3q7y01+QzzD8ok7Mw//Dw==

API call

GET /api/attest/97ae87622e87489e14b53bdafb84dea7382ea85eaf3d0286c75271ccb13b021d

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.