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":26220522,"chain":"ethereum","checked_at":"2026-10-18T16:04:14Z","dev":false,"expires_at":"2026-10-19T16:04:14Z","issuer":"Ondo","pool":{"base":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"17540227022","decimals":6,"symbol":"USDC"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","quote":{"address":"0xc9eef266834730340A55B6CC24621B31BAF55581","balance":"1932148870203448573808","decimals":18,"symbol":"SPCXon"}},"quote_share_of_supply":0.03482768849916797,"reads":[{"block":26220522,"method":"eth_blockNumber","params":[],"result_hash":"ff84cd1b22509fa9b0d45d2c817688c9223b284d252bb997f6c3ddb3dccaa637","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(\"17540227022\")","result_hash":"25da775a5e72af83364db3e9eec65e53d3fe8f8a463bd9464ed542dbd558482a","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(\"1932148870203448573808\")","result_hash":"2676c4e07f0381762e815751b8ee02729e918d8457f8be3f9f990fec677bd014","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(\"48236481061486501\")","result_hash":"54225bc2ea7bcb8f6e5bb45aea0f654e9514fa32942ea73e097f3be49b7bdd19","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(\"55477378874845717194125\")","result_hash":"70c8a18c74b5ae66d5a1cc95d42f7942cf2a53a3f7ef2122285ed0ebcbac53d9","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":"2026-10-18T09:47:35Z","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":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xc9101FAaac077d2F7A30c60d3D89955E1a89Fa8b","ticker":"SPCX","verdict":{"Verified":{"issuer":"Ondo","ticker":"SPCX"}},"version":1}

Signature

swoAoguvGQ8liLdzI77BK/zaGumZEPwekLx9kzz4Ya7EqiFvz5V3iM+y1illcNX7kPpcW4xjx2UZLy30S1CiBw==

API call

GET /api/attest/d5b67981b52906606e55344705474e43d6182210508dcb1eb4818e0ae6259e4b

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.