Does KOon / 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":26229390,"chain":"ethereum","checked_at":"2026-10-19T21:44:42Z","dev":false,"expires_at":"2026-10-20T21:44:42Z","issuer":"Ondo","pool":{"base":{"address":"0x74a03d741226f738098C35da8188E57acA50d146","balance":"10745520097894096613","decimals":18,"symbol":"KOon"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"1017535246","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":0.00024516616548887846,"reads":[{"block":26229390,"method":"eth_blockNumber","params":[],"result_hash":"5401cb77401eb6b22abbfe37f808205023026f400d46652853567afc940f8279","slot":null},{"block":null,"method":"eth_call","params":["0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","token0()"],"raw_result":"0x74a03d741226f738098c35da8188e57aca50d146","result_hash":"0894c7470b49802f833153ad7de6e6b63a509f602f795da5863d8076dcee3ec8","slot":null},{"block":null,"method":"eth_call","params":["0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","token1()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0x74a03d741226f738098C35da8188E57acA50d146","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xbb8"],"raw_result":"0xf758c32ade8a8bace145cba8b23c18baf2f73afb","result_hash":"eccb6f6b9ca48b1f209d258d15eb4cac4814e4715b7a9afeae4b93f218c9a6bf","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","symbol()"],"raw_result":"Some(\"KOon\")","result_hash":"76e1a5765a71d0ab8113a99d6ed8494376be274614d9589f385a7154ab72df4a","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","balanceOf","0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB"],"raw_result":"Some(\"10745520097894096613\")","result_hash":"e0dc316ee72c103449ed0f85de5c9396d8d86f7fe0fd9fdd88047bfefad76354","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","0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB"],"raw_result":"Some(\"1017535246\")","result_hash":"7df5911f6f40fd0da6b2d1bbb7415d9f593426bf402521a37621ea51d71af6ef","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(\"47865017174563429\")","result_hash":"6a90bad2a008d17dc14c3babbcdbf0bac3750e34a7e68558124742b11e5becfd","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","symbol()"],"raw_result":"Some(\"KOon\")","result_hash":"76e1a5765a71d0ab8113a99d6ed8494376be274614d9589f385a7154ab72df4a","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","name()"],"raw_result":"Some(\"Coca-Cola (Ondo Tokenized)\")","result_hash":"a82b51492ac219d5d9d8befaeecd2cac99aa440587cc973aa1314207945ca32b","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x74a03d741226f738098C35da8188E57acA50d146","totalSupply()"],"raw_result":"Some(\"43829539351267247508550\")","result_hash":"d84f7960056f7486f1d99f273ba78b0c1656246773558cb2825e08e831b5d456","slot":null},{"block":null,"method":"eth_getCode","params":["0x74a03d741226f738098C35da8188E57acA50d146","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0x74a03d741226f738098C35da8188E57acA50d146","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x74a03d741226f738098C35da8188E57acA50d146","decimals":null,"issuer":"Ondo","last_checked":"2026-10-19T21:40:22Z","name":"Coca-Cola (Ondo Tokenized)","official_deployments":[{"address":"0x74a03d741226f738098C35da8188E57acA50d146","network":"Ethereum"},{"address":"0x405F38B90beBF1259062CF29Da299f3398662bcb","network":"BNB Chain"},{"address":"e6G4pfFcrdKxJuZ4YXixRFfMbpMvgXG2Mjcus71ondo","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":"KO"},"registry_hash":"37f76e783440d042a6ba377568afbebcf983880e6cc47a429b6670672394702e","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xf758C32ADE8A8baCe145CBA8b23C18baf2F73AFB","ticker":"KO","verdict":{"Verified":{"issuer":"Ondo","ticker":"KO"}},"version":1}

Signature

ksFpXunGVtR5yU+Fa0qCcTw0la8Z4+w2quR7ktBerjHtgkhalLrZNZ5mQWC25YSwrcSiC0IECSDr6OxOVO74Aw==

API call

GET /api/attest/b1031cfbf710e23a8a72847c43db99e2cd5482dc9cca4f2e36f1534eb30c27ae

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.