Does STRCx / 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":26221388,"chain":"ethereum","checked_at":"2026-10-18T18:58:00Z","dev":false,"expires_at":"2026-10-19T18:58:00Z","issuer":"Backed xStocks","pool":{"base":{"address":"0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","balance":"46871487085617556559960","decimals":18,"symbol":"STRCx"},"chain":"ethereum","dex":"uniswap-v4","pool":"0xabc4aca2bbede9a98563f7660e126272f1a86137ba07c655e4d4ec2245a933bf","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"4582058998736","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":0.027480280823381237,"reads":[{"block":null,"method":"eth_call","params":["0xbd216513d74c8cf14cf4747e6aaa6420ff64ee9e","poolKeys","0xabc4aca2bbede9a98563f7660e126272f1a86137ba07c655e4"],"raw_result":"Object {\"currency0\": String(\"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3\"), \"currency1\": String(\"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48\"), \"fee\": String(\"888\"), \"hooks\": String(\"0x0000000000000000000000000000000000000000\"), \"tickSpacing\": String(\"9\")}","result_hash":"641f8a121dccea8b293182e2af912c5a07c4dfef4fceec3a2422d2aa589f1e5d","slot":null},{"block":null,"method":"eth_call","params":["0x7ffe42c4a5deea5b0fec41c94c136cf115597227","getSlot0","0xabc4aca2bbede9a98563f7660e126272f1a86137ba07c655e4d4ec2245a933bf"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x7ffe42c4a5deea5b0fec41c94c136cf115597227","getLiquidity","0xabc4aca2bbede9a98563f7660e126272f1a86137ba07c655e4d4ec2245a933bf"],"raw_result":"463430598023913596","result_hash":"56df59087089ec19918f81aa75ac5ef0a318b3f84d014a5d66cdc721a526f04c","slot":null},{"block":null,"method":"eth_call","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","symbol()"],"raw_result":"Some(\"STRCx\")","result_hash":"7bda8834d5f2fb73dff294a0f7a650a4ad7fa56f78807beabb4a4b64329024a2","slot":null},{"block":null,"method":"eth_call","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","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":26221388,"method":"eth_blockNumber","params":[],"result_hash":"fc884e840f9d9c8939176e251c495a2a0d3280e4d0107c589a3534023be1de1a","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(\"48196581084207226\")","result_hash":"1e11dc71df72e882d08113d182ed39a424f8ffd45ccf7790f89d0e501b9c7bb8","slot":null},{"block":null,"method":"eth_call","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","symbol()"],"raw_result":"Some(\"STRCx\")","result_hash":"7bda8834d5f2fb73dff294a0f7a650a4ad7fa56f78807beabb4a4b64329024a2","slot":null},{"block":null,"method":"eth_call","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","name()"],"raw_result":"Some(\"Strategy PP Variable xStock\")","result_hash":"ae81b92a573c618fd4dd46f03b74a68464872a4175216d6d95b813f5fefa0614","slot":null},{"block":null,"method":"eth_call","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","totalSupply()"],"raw_result":"Some(\"1705640760619067826422205\")","result_hash":"fb846f6e06cc17af14afcbfa2bf5d0cef077eb64e5e947393acbe30b7bfeee9a","slot":null},{"block":null,"method":"eth_getCode","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null},{"block":null,"method":"eth_getCode","params":["0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x1Aad217B8F78dbA5E6693460e8470F8b1A3977f3","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-10-18T18:54:08Z","name":"Strategy PP Variable","official_deployments":[{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"Ethereum","wrapper_address":"0x34d78e7b06542dab48f9bf9f0835c7582141314e","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"BinanceSmartChain","wrapper_address":"0x34d78e7b06542dab48f9bf9f0835c7582141314e","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"Arbitrum","wrapper_address":"0x34d78e7b06542dab48f9bf9f0835c7582141314e","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"Xs78JED6PFZxWc2wCEPspZW9kL3Se5J7L5TChKgsidH","network":"Solana"},{"address":"TUsRFkJG8LZ5fqh2TSmHUSw7kRWUbzfqAF","network":"Tron"},{"address":"EQCY_xOUxnGsF91w0w3azMdk1SMdBKNr7kJedDWTZlQ13duK","network":"Ton"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"Mantle","wrapper_address":"0x34d78e7b06542dab48f9bf9f0835c7582141314e","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"HyperEVM","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"Ink","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"XLayer","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"Optimism","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"},{"address":"0x1aad217b8f78dba5e6693460e8470f8b1a3977f3","network":"Monad","wrapper_address_v2":"0x0b2456017c5df2dfc0289740c4b352049892780c"}],"source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"STRC"},"registry_hash":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xabc4aca2bbede9a98563f7660e126272f1a86137ba07c655e4d4ec2245a933bf","ticker":"STRC","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"STRC"}},"version":1}

Signature

+3TWSr0yejcK+NAnGypJ8oYJg7udLjb1qLst25WvTklYqatpGIgobLgUoLjN+WfKBiLff64XPediypolBOq3CQ==

API call

GET /api/attest/46292fda05e274e990804b622bef64ef09a03670d64d60082b6cdec0547d1434

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.