USDT/CRCLx

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":124812702,"chain":"Bnb","checked_at":"2026-09-30T00:29:03Z","dev":false,"expires_at":"2026-10-01T00:29:03Z","issuer":"Backed xStocks","pool":{"base":{"address":"0x55d398326f99059fF775485246999027B3197955","balance":"9576447533494247298","decimals":18,"symbol":"USDT"},"chain":"Bnb","dex":"pancake-v3","pool":"0x86907049b41554A47ba0e5B758Af44f51F54f259","quote":{"address":"0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","balance":"140541083269061590","decimals":18,"symbol":"CRCLx"}},"quote_share_of_supply":3.3936296932191414e-6,"reads":[{"block":null,"method":"eth_getCode","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","latest"],"result_hash":"1c9409806518d1a5f52d79299ea0289ea2ff527e05895cd8f7a36d4cca28a13e","slot":null},{"block":null,"method":"eth_getCode","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","latest"],"result_hash":"1c9409806518d1a5f52d79299ea0289ea2ff527e05895cd8f7a36d4cca28a13e","slot":null},{"block":null,"method":"eth_getCode","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","latest"],"result_hash":"1c9409806518d1a5f52d79299ea0289ea2ff527e05895cd8f7a36d4cca28a13e","slot":null},{"block":null,"method":"eth_getCode","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","latest"],"result_hash":"9b64f0444f4ab8b91e7457850736641ac77799ac701dab77378bb21261cac773","slot":null},{"block":124812702,"method":"eth_blockNumber","params":[],"result_hash":"90f2dc740c6b24e08fa653eefa4bbfb15ae4520245704da55b02aa6964fd1672","slot":null},{"block":null,"method":"eth_call","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","token0()"],"raw_result":"0x55d398326f99059ff775485246999027b3197955","result_hash":"66f63b72a2cc2125a9e796877d8894f3c7efb1d98419d7f1f9800b08f25cdc61","slot":null},{"block":null,"method":"eth_call","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","token1()"],"raw_result":"0xfebded1b0986a8ee107f5ab1a1c5a813491deceb","result_hash":"79c895f5d51c9d2ea9f623afaabc2442c350e7ccd28db2c3deb3936f3510ce96","slot":null},{"block":null,"method":"eth_call","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x86907049b41554A47ba0e5B758Af44f51F54f259","factory()"],"raw_result":"Some(0x0bfbcf9fa4f9c56b0f40a671ad40e0805a091865)","result_hash":"da1f4544b9417a11911907f7a632e9c00b511a10bfd124a8879882f21abb2fe7","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","symbol()"],"raw_result":"Some(\"USDT\")","result_hash":"a851493323e1198c0940c2b2ca5c59e97da9c6f50f63f0c09779709ef2572f84","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","balanceOf","0x86907049b41554A47ba0e5B758Af44f51F54f259"],"raw_result":"Some(\"9576447533494247298\")","result_hash":"12e25873770a8f7a633b8869a4b882daa81f2f84ea8788c2a0a116fba5b25f62","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","symbol()"],"raw_result":"Some(\"CRCLx\")","result_hash":"e6b8a44b5ed71669fddfbadd69171449bc1af5981ce01d3ee09104646b895fea","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","balanceOf","0x86907049b41554A47ba0e5B758Af44f51F54f259"],"raw_result":"Some(\"140541083269061590\")","result_hash":"317cfb37aaf6dea9278cbefcc536142e17e20c9ba3b91f49e519e35fcfb44870","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","symbol()"],"raw_result":"Some(\"USDT\")","result_hash":"a851493323e1198c0940c2b2ca5c59e97da9c6f50f63f0c09779709ef2572f84","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","name()"],"raw_result":"Some(\"Tether USD\")","result_hash":"8f7cfea6e15ea5712d4bf603e3223e8de9dfdee3c5fe9a25ec1181218bd425ad","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x55d398326f99059fF775485246999027B3197955","totalSupply()"],"raw_result":"Some(\"9184991859680809663064697687\")","result_hash":"3e019cb4c0a909cc660859350c58660f21b07328cb9a21194c9119b0167d8880","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","symbol()"],"raw_result":"Some(\"CRCLx\")","result_hash":"e6b8a44b5ed71669fddfbadd69171449bc1af5981ce01d3ee09104646b895fea","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","name()"],"raw_result":"Some(\"Circle xStock\")","result_hash":"a773d766a4cef1ad99105422276b716af516af2bf72b1e9ab1a92e09584351c7","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","totalSupply()"],"raw_result":"Some(\"41413205321098724314000\")","result_hash":"6edc151407183d1b6d0949b5e9e5f2c1a4abfae2f6a7576c85cb09c0040f2e74","slot":null},{"block":null,"method":"eth_getCode","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null},{"block":null,"method":"eth_getCode","params":["0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null}],"registry_entry":{"chain":"Bnb","contract":"0xfEbDEd1B0986a8ee107f5AB1a1c5a813491DeCEB","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-09-29T23:37:23Z","name":"Circle","source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"CRCL"},"registry_hash":"b3f72fc9046ef9a37e433405d5916bce13581b85d8cce5889f24cf56e53b77b4","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x86907049b41554A47ba0e5B758Af44f51F54f259","ticker":"CRCL","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"CRCL"}},"version":1}

Signature

JOENJnZHYrOUxHM0PpOl5BvqIZ+iJLb43ONHgeJMs0nNx1vvBn9FWV0bX37Bn+7z0l2owxCxAoblPeqS2k6ICA==

API call

GET /api/attest/560c3fc41eb81b7f9095b34f18727e8afe3d964147d966bf2f4a619213e24ffc

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.