Does SPCXon / 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":26229345,"chain":"ethereum","checked_at":"2026-10-19T21:35:50Z","dev":false,"expires_at":"2026-10-20T21:35:50Z","issuer":"Ondo","pool":{"base":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"56303942518","decimals":6,"symbol":"USDC"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","quote":{"address":"0xc9eef266834730340A55B6CC24621B31BAF55581","balance":"1675810104262918523446","decimals":18,"symbol":"SPCXon"}},"quote_share_of_supply":0.02973200137857417,"reads":[{"block":26229345,"method":"eth_blockNumber","params":[],"result_hash":"23901d2366a67e4198da96c5e3288b76db256ca21d7186ca4d0fbfcb84671189","slot":null},{"block":null,"method":"eth_call","params":["0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","token0()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","token1()"],"raw_result":"0xc9eef266834730340a55b6cc24621b31baf55581","result_hash":"06e54addfe23a93fb580f532e8a76c3ae939b7caa05c4a0b376df92b8177b89f","slot":null},{"block":null,"method":"eth_call","params":["0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xc9eef266834730340A55B6CC24621B31BAF55581","0xbb8"],"raw_result":"0xc9101faaac077d2f7a30c60d3d89955e1a89fa8b","result_hash":"fd0122c3244b24f98b2209d8d5093a64ebb1a37f7dee946bdfc50e9895b2053e","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","0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b"],"raw_result":"Some(\"56303942518\")","result_hash":"0c3f5054af50189971ea20474da41dffc2f91fa500c2d20a66aafe1317c1178e","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","symbol()"],"raw_result":"Some(\"SPCXon\")","result_hash":"c6542914d1f0fba46d44885ece2850ebca64071033ed55e720d9bd9656b5c9ce","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","balanceOf","0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b"],"raw_result":"Some(\"1675810104262918523446\")","result_hash":"58bb0f0eef7580cb63e0229422cf71243fac2c272be82e4868b43c6c6ccf2b6e","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(\"47869490540919092\")","result_hash":"b4e4147c5ef891bb2d75eeecdf4085c200f47c4a8197eee3269b29bc61e3292b","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","symbol()"],"raw_result":"Some(\"SPCXon\")","result_hash":"c6542914d1f0fba46d44885ece2850ebca64071033ed55e720d9bd9656b5c9ce","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","name()"],"raw_result":"Some(\"SpaceX (Ondo Tokenized)\")","result_hash":"8e183718b619bbadee2374ed07d48eb982d73a487ea95ae959dc63a2dc3ee082","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","totalSupply()"],"raw_result":"Some(\"56363851290231699186964\")","result_hash":"8c8b8e180c89e5f23be1d892b0b250b67aacf283171e2d0ad9da88d3aff52bb4","slot":null},{"block":null,"method":"eth_getCode","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0xc9eef266834730340A55B6CC24621B31BAF55581","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0xc9eef266834730340A55B6CC24621B31BAF55581","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T20:40:22Z","name":"SpaceX (Ondo Tokenized)","official_deployments":[{"address":"0xc9eef266834730340A55B6CC24621B31BAF55581","network":"Ethereum"},{"address":"0xd0a58BC9D88D3FF48C0294Cb7e45937d0E41A928","network":"BNB Chain"},{"address":"wzAyQTorWyoVXuJKj2x8EqKEGJpS13z6EWE9z5Aondo","network":"Solana"}],"source":"https://docs.ondo.finance/addresses.md","source_url":"https://www.dropbox.com/scl/fi/qjfxyg748mx0dwi6up86d/EXTERNAL-Ondo-GM-Tokens-Ondo-GM-Tokens.csv?rlkey=n3no1w78wrah3umsl0nr9s77i&e=2&st=spdit2q1&dl=1","ticker":"SPCX"},"registry_hash":"ec814fa92798a593ad5e6f9f4b7dbb22f489a5f439cf1b1999433b413a193021","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","ticker":"SPCX","verdict":{"Verified":{"issuer":"Ondo","ticker":"SPCX"}},"version":1}

Signature

mIHSlF8BXhmbhuHu7IGh955CS/Y3sP7fzbJvBbE5IFKrC5/8pH5ol7xwfh3duVc9hkmo1K7QsIS6/aQaLyU1Cg==

API call

GET /api/attest/1dadd42207e59ce809a10312ca486cae50a61d2db2b3144dfae870cbc03cdfe6

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.