Does TSLAx / USDC 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":26223803,"chain":"ethereum","checked_at":"2026-10-19T03:02:20Z","dev":false,"expires_at":"2026-10-20T03:02:20Z","issuer":"Backed xStocks","pool":{"base":{"address":"0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","balance":"396499548823209891","decimals":18,"symbol":"TSLAx"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"81769293","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":8.81110108496022e-6,"reads":[{"block":26223803,"method":"eth_blockNumber","params":[],"result_hash":"5285182648aa8f94fdac5138d183587be815ee5217928ac05d1c956c38d44eee","slot":null},{"block":null,"method":"eth_call","params":["0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","token0()"],"raw_result":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","result_hash":"9e226d71c5a04bde5dc6e1503d7a53401e50691638dbeb006b27fccb4b8b6517","slot":null},{"block":null,"method":"eth_call","params":["0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","token1()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xbb8"],"raw_result":"0xa7fd774e0ad54a6d2ceafb4103615f473e589cc6","result_hash":"78c45960bddaf4f0529bab016ab80930019d9c825f19cd0fd44577e6d10aabb6","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","symbol()"],"raw_result":"Some(\"TSLAx\")","result_hash":"22a5c9c6b5661d98827157c975d46bdc2096c94ec42ab6f06a1ad872b7ac7421","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","balanceOf","0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6"],"raw_result":"Some(\"396499548823209891\")","result_hash":"5e13008da63957e2f71820b0efd9d72bba72feb78b19ab8d4729340766c6ef02","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balanceOf","0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6"],"raw_result":"Some(\"81769293\")","result_hash":"95415d67227c6d534d28668765568a2cbda9b2c26f5f11e02db4ca6ee67920e1","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","name()"],"raw_result":"Some(\"USD Coin\")","result_hash":"fe94af15dc887a2c9df1fb0d6d276e6c586ca9d430ffeac0d05e4baee0637fd1","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","totalSupply()"],"raw_result":"Some(\"48174008450523737\")","result_hash":"0deaf74c188729e215c945ded466473febe9858df101f7cd17e10d2870408736","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","symbol()"],"raw_result":"Some(\"TSLAx\")","result_hash":"22a5c9c6b5661d98827157c975d46bdc2096c94ec42ab6f06a1ad872b7ac7421","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","name()"],"raw_result":"Some(\"Tesla xStock\")","result_hash":"b3eee95777237754beb105b18a3646de9025dac049960403b7a7d51c31f32bbc","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","totalSupply()"],"raw_result":"Some(\"45000000000000000000000\")","result_hash":"3883fcf18891f6d0048a4c693fe8c16849417b3359224e09d00d37810e2bcdf7","slot":null},{"block":null,"method":"eth_getCode","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null},{"block":null,"method":"eth_getCode","params":["0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x8aD3c73F833d3F9A523aB01476625F269aEB7Cf0","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-10-19T02:40:19Z","name":"Tesla","official_deployments":[{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"Ethereum","wrapper_address":"0x43680abf18cf54898be84c6ef78237cfbd441883","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"BinanceSmartChain","wrapper_address":"0x43680abf18cf54898be84c6ef78237cfbd441883","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"Arbitrum","wrapper_address":"0x43680abf18cf54898be84c6ef78237cfbd441883","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"XsDoVfqeBukxuZHWhdvWHBhgEHjGNst4MLodqsJHzoB","network":"Solana"},{"address":"TTfj39Vm7ATpNJMsfDUWYVzxK8mPPA4yYE","network":"Tron","wrapper_address":"TKrn1iaLixroSFgn8mVM5UnxGsDf8jBXEE"},{"address":"EQB4IwqWZPUczntdry8vSN2tsJKt-9F7iIb7gEFREYYOB563","network":"Ton"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"Mantle","wrapper_address":"0x43680abf18cf54898be84c6ef78237cfbd441883","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"HyperEVM","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"Ink","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"XLayer","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"Optimism","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"},{"address":"0x8ad3c73f833d3f9a523ab01476625f269aeb7cf0","network":"Monad","wrapper_address_v2":"0xc3fdbe3a68ee5de461d30415a8165cf9aefe1171"}],"source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"TSLA"},"registry_hash":"0bd20861acb250fc115ebe98f0dbbb7c686b15c772a071c9020aa5154f2d195f","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xA7fd774E0aD54A6D2CeAfB4103615f473E589cC6","ticker":"TSLA","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"TSLA"}},"version":1}

Signature

S6TfELyoALuJwOoqD18MLXJECI/DjwTJ+XnDQ8tLEolu0XPUHiC4xdUHjomKZd6LD/llkQ2lImnc5ROfYTb0Aw==

API call

GET /api/attest/4bae18d695308972425b876f64e97316e9d42d218d0ded6de5feb15512dab544

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.