Does MSFTon / 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":26221964,"chain":"ethereum","checked_at":"2026-10-18T20:53:23Z","dev":false,"expires_at":"2026-10-19T20:53:23Z","issuer":"Ondo","pool":{"base":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"1295444565","decimals":6,"symbol":"USDC"},"chain":"ethereum","dex":"uniswap-v3","pool":"0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","quote":{"address":"0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","balance":"1199528023608815477","decimals":18,"symbol":"MSFTon"}},"quote_share_of_supply":0.00012454750798757374,"reads":[{"block":26221964,"method":"eth_blockNumber","params":[],"result_hash":"ba7c10b67347adc21110ca2262d6886c6cac0fad2375f79bddb1b1fca4246eb1","slot":null},{"block":null,"method":"eth_call","params":["0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","token0()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","token1()"],"raw_result":"0xb812837b81a3a6b81d7cd74cfb19a7f2784555e5","result_hash":"6cb678525eb0fa248ed139c7d67110bd07a3e56d12db183829eb3f1be684a1a8","slot":null},{"block":null,"method":"eth_call","params":["0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","0x2710"],"raw_result":"0x33b80e73d77b04dd43a1401de99a74b8bf1c5177","result_hash":"c5bf3035b0943f88c889c759b5134365e56bba5381efc1833dffdbfd787bfbd5","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","0x33B80E73D77b04DD43a1401De99A74b8BF1c5177"],"raw_result":"Some(\"1295444565\")","result_hash":"d7eafc3d3463d45107a7ffa99823020134dc45d7752533f1eb5fb9eb2eb13cf5","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","symbol()"],"raw_result":"Some(\"MSFTon\")","result_hash":"99c1e874a291d35713113c940db4371f683c68ca415953d188e66e72a99d7562","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","balanceOf","0x33B80E73D77b04DD43a1401De99A74b8BF1c5177"],"raw_result":"Some(\"1199528023608815477\")","result_hash":"73874f67c1032cc04e72371206a92dc0cec1b79fbcb6a67fe5aaa291425acdf9","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(\"48219231640672328\")","result_hash":"b4e079af0aef80d8aad56ddeebde603bc5b8a9f002596e78ef0c3f182a80b29f","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","symbol()"],"raw_result":"Some(\"MSFTon\")","result_hash":"99c1e874a291d35713113c940db4371f683c68ca415953d188e66e72a99d7562","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","name()"],"raw_result":"Some(\"Microsoft (Ondo Tokenized)\")","result_hash":"32ea9ce23f283bd0bc3d9d788a09a5fe7f56e96caa56b263588b350ed1268eb5","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","totalSupply()"],"raw_result":"Some(\"9631088112405217440783\")","result_hash":"b453ac6c43ac0d98e18acf1a5b6df0e881dd693d8e6f19580911dbea04bc13fa","slot":null},{"block":null,"method":"eth_getCode","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T20:40:22Z","name":"Microsoft (Ondo Tokenized)","official_deployments":[{"address":"0xB812837b81a3a6b81d7CD74CfB19A7f2784555E5","network":"Ethereum"},{"address":"0x6Bfe75D1ad432050eA973C3A3DcD88F02e2444C3","network":"BNB Chain"},{"address":"FRmH6iRkMr33DLG6zVLR7EM4LojBFAuq6NtFzG6ondo","network":"Solana"},{"address":"0xD53471f6D493f7eD766181D88Ba9c2Bfc371399A","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":"MSFT"},"registry_hash":"232d0be2eda56472709e0cf69b424df4c8dd39a27138a34cf3d57c8f428c0f9e","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x33B80E73D77b04DD43a1401De99A74b8BF1c5177","ticker":"MSFT","verdict":{"Verified":{"issuer":"Ondo","ticker":"MSFT"}},"version":1}

Signature

WhvbrYKll6PkissEu82YO8ypyUkndMiTJMrcQ9lArBTyzcTMg7W+kh6ymz7vYanAnOHR4qq4VpFHcbd0QzA+AA==

API call

GET /api/attest/909e13a0ed0c653c1b264c3ed50e1ae435433c60344df4371aa5a75c184804b8

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.