Does AAPLon / 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":26220542,"chain":"ethereum","checked_at":"2026-10-18T16:08:15Z","dev":false,"expires_at":"2026-10-19T16:08:15Z","issuer":"Ondo","pool":{"base":{"address":"0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","balance":"32602026289301404185","decimals":18,"symbol":"AAPLon"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"27195141287","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":0.001978819940794106,"reads":[{"block":26220542,"method":"eth_blockNumber","params":[],"result_hash":"8209bfb0e94e44bdacf55e67b32e7d30967e312e611d2d713cb700726d25d01c","slot":null},{"block":null,"method":"eth_call","params":["0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","token0()"],"raw_result":"0x14c3abf95cb9c93a8b82c1cdcb76d72cb87b2d4c","result_hash":"cbef9e1e2e3104003d9c7522e822a36ff2209f43af0b42838ccead4fe5ed066f","slot":null},{"block":null,"method":"eth_call","params":["0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","token1()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0x2710"],"raw_result":"0xad82c9eb065a5cfed71db087e4a52c8a09c69921","result_hash":"019b19d3fddee1a2c06c521ee070811d3852abe85ce16c67d18b50ff70378e44","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","symbol()"],"raw_result":"Some(\"AAPLon\")","result_hash":"6cfe5b4e813b281042afd14ebca189eb981c006670cba86b1070efb6a2bf8980","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","balanceOf","0xad82C9EB065a5CFed71DB087e4a52C8a09c69921"],"raw_result":"Some(\"32602026289301404185\")","result_hash":"0d477cdbd8796f6494c18ac00384543e485b0d0b8a2aa6413a54ade51206e2fe","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","0xad82C9EB065a5CFed71DB087e4a52C8a09c69921"],"raw_result":"Some(\"27195141287\")","result_hash":"71b190ef7e08f9cbe18567e6973f72c7b15a017d38b3bd6e5a98d2172da50a61","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(\"48241816477871680\")","result_hash":"4f439c7ecbf8d4422ae474c95c638eee7a885fb435e04b041fb6d43c016d4d26","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","symbol()"],"raw_result":"Some(\"AAPLon\")","result_hash":"6cfe5b4e813b281042afd14ebca189eb981c006670cba86b1070efb6a2bf8980","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","name()"],"raw_result":"Some(\"Apple (Ondo Tokenized)\")","result_hash":"4df95367ca8dd5dbcedce101864ce0e8244551d86114f5d7fd8d5b2fc863e216","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","totalSupply()"],"raw_result":"Some(\"16475489061535392534249\")","result_hash":"d7696d0812fcfd8905a8aa0fe12597774da9caded8393b6ceb861b6f3ac52b45","slot":null},{"block":null,"method":"eth_getCode","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T09:47:35Z","name":"Apple (Ondo Tokenized)","official_deployments":[{"address":"0x14c3abF95Cb9C93a8b82C1CdCB76D72Cb87b2d4c","network":"Ethereum"},{"address":"0x390a684EF9cADE28A7AD0DFa61AB1Eb3842618c4","network":"BNB Chain"},{"address":"123mYEnRLM2LLYsJW3K6oyYh8uP1fngj732iG638ondo","network":"Solana"},{"address":"0x81db0DF77669b3BE563e7a0591685a2C8C3EE1c5","network":"HyperEVM"}],"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":"AAPL"},"registry_hash":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xad82C9EB065a5CFed71DB087e4a52C8a09c69921","ticker":"AAPL","verdict":{"Verified":{"issuer":"Ondo","ticker":"AAPL"}},"version":1}

Signature

OlIWtFCGHSuDeUgRZ0IYU2M94n7Y2mfRpnC6Yw1ffEKP0le++vhvNSdwZqQfTDSBx1823AEhPEK9IismLSbFDw==

API call

GET /api/attest/7db06b6b3e3486060b628f9b5800a5bf03272d296eda7e605195d3109e1609b2

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.