Does PLTRx / 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":26223806,"chain":"ethereum","checked_at":"2026-10-19T03:02:57Z","dev":false,"expires_at":"2026-10-20T03:02:57Z","issuer":"Backed xStocks","pool":{"base":{"address":"0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","balance":"419020111375986489","decimals":18,"symbol":"PLTRx"},"chain":"ethereum","dex":"uniswap-v4","pool":"0x828c4474eb15bf88893e7fd4f202f1c6619faa3edbd3b577fba1bde1701b95bd","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"65717170","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":3.971754610198924e-6,"reads":[{"block":null,"method":"eth_call","params":["0xbd216513d74c8cf14cf4747e6aaa6420ff64ee9e","poolKeys","0x828c4474eb15bf88893e7fd4f202f1c6619faa3edbd3b577fb"],"raw_result":"Object {\"currency0\": String(\"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2\"), \"currency1\": String(\"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48\"), \"fee\": String(\"880000\"), \"hooks\": String(\"0x0000000000000000000000000000000000000000\"), \"tickSpacing\": String(\"17600\")}","result_hash":"bec42a3e1d438928cd75a919ce41a5aa736f256f77fcdd618f4ff9514aa8fe2f","slot":null},{"block":null,"method":"eth_call","params":["0x7ffe42c4a5deea5b0fec41c94c136cf115597227","getSlot0","0x828c4474eb15bf88893e7fd4f202f1c6619faa3edbd3b577fba1bde1701b95bd"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x7ffe42c4a5deea5b0fec41c94c136cf115597227","getLiquidity","0x828c4474eb15bf88893e7fd4f202f1c6619faa3edbd3b577fba1bde1701b95bd"],"raw_result":"5247553364353","result_hash":"45e85a783e4a682da77f4d306ae874907bed2d455f834f6c974dfa8b86edf2a0","slot":null},{"block":null,"method":"eth_call","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","symbol()"],"raw_result":"Some(\"PLTRx\")","result_hash":"889bbd3b8aef9c4bab2910a924f83436c3dab0c7be18c36a3815660c75031b4a","slot":null},{"block":null,"method":"eth_call","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","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":26223806,"method":"eth_blockNumber","params":[],"result_hash":"001390ae16c3960dc1838d787ad1e397906699d86b6d0261cead20864bbaeaf1","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(\"48174000403065787\")","result_hash":"0b21cf19a23b02c4706aabfcaca47544bd5a670016be40020874ce062b7336cd","slot":null},{"block":null,"method":"eth_call","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","symbol()"],"raw_result":"Some(\"PLTRx\")","result_hash":"889bbd3b8aef9c4bab2910a924f83436c3dab0c7be18c36a3815660c75031b4a","slot":null},{"block":null,"method":"eth_call","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","name()"],"raw_result":"Some(\"Palantir xStock\")","result_hash":"331bdc2513da68975f3dc449f0a27cb5b703c43896159138bfc1585527d3ede9","slot":null},{"block":null,"method":"eth_call","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","totalSupply()"],"raw_result":"Some(\"105500000000000000000000\")","result_hash":"aab503c1f8dd6915dae5cbe7d49cfe574ba25b71c8fad773ab3b82cf86635fc1","slot":null},{"block":null,"method":"eth_getCode","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null},{"block":null,"method":"eth_getCode","params":["0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x6d482CeC5f9dd1f05CCee9Fd3ff79B246170F8e2","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-10-19T02:40:19Z","name":"Palantir","official_deployments":[{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"Ethereum","wrapper_address":"0xa3b6fe1a923585bb828fcfaa460b78eefd5ae2ec","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"BinanceSmartChain","wrapper_address":"0xa3b6fe1a923585bb828fcfaa460b78eefd5ae2ec","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"Arbitrum","wrapper_address":"0xa3b6fe1a923585bb828fcfaa460b78eefd5ae2ec","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"XsoBhf2ufR8fTyNSjqfU71DYGaE6Z3SUGAidpzriAA4","network":"Solana"},{"address":"TKDP8XW5HehcSVouE7wnJRW6MPEE7q6WRR","network":"Tron"},{"address":"EQCGOLDdW8rldaSAlCE9yJabqk2uRJz2PaH3CTRyP6VLVjXL","network":"Ton"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"Mantle","wrapper_address":"0xa3b6fe1a923585bb828fcfaa460b78eefd5ae2ec","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"HyperEVM","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"Ink","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"XLayer","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"Optimism","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"},{"address":"0x6d482cec5f9dd1f05ccee9fd3ff79b246170f8e2","network":"Monad","wrapper_address_v2":"0x4a2df09536f62341c9f946427d16414c04e21342"}],"source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"PLTR"},"registry_hash":"0bd20861acb250fc115ebe98f0dbbb7c686b15c772a071c9020aa5154f2d195f","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x828c4474eb15bf88893e7fd4f202f1c6619faa3edbd3b577fba1bde1701b95bd","ticker":"PLTR","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"PLTR"}},"version":1}

Signature

iBcDLwqdgSqo69yxmxy3MR16EJOJOrCcIo4EVh52D4vgnrTDLFwYO0U7md9bXBZNVwpLHxSthUp8jJrREpCpCQ==

API call

GET /api/attest/6df9926d8e1b51ec8c2a68495c594ad433dd9823c0468db2e289a035149a5ab8

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.