Does UMCon / SCI6900 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":129000829,"chain":"bnb","checked_at":"2026-10-21T20:19:31Z","dev":false,"expires_at":"2026-10-22T20:19:31Z","issuer":"Ondo","pool":{"base":{"address":"0x318ddd4d03d84A40cf44772385A0CFB3D4394049","balance":"4242874299541616084","decimals":18,"symbol":"UMCon"},"chain":"bnb","dex":"pancake-v2","pool":"0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D","quote":{"address":"0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","balance":"10743600160675623421089659","decimals":18,"symbol":"SCI6900"}},"quote_share_of_supply":0.030947671290998888,"reads":[{"block":129000829,"method":"eth_blockNumber","params":[],"result_hash":"2792a5e588aa739794bec26909b1f44c6574d5950e9d4108ee5c3c08e4682478","slot":null},{"block":null,"method":"eth_call","params":["0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D","token0()"],"raw_result":"0x318ddd4d03d84a40cf44772385a0cfb3d4394049","result_hash":"c5c6901d890590215b60dda413d212428bda089e01df11c8986cef43e2d426be","slot":null},{"block":null,"method":"eth_call","params":["0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D","token1()"],"raw_result":"0x372d9b65624d6e9b7e839d5d8e4561a7aff57777","result_hash":"d8a68559f6b78d4567e69e40cb6d2eb942aacad133588e36b2454aafc08d52fe","slot":null},{"block":null,"method":"eth_call","params":["0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D","getReserves()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D","factory()"],"raw_result":"0xca143ce32fe78f1f7019d7d551a6402fc5350c73","result_hash":"cca9f0708cbe3ba281b9d1b8ebd0a086cc47571f860d681f7f16e9e8a73617f9","slot":null},{"block":null,"method":"eth_call","params":["0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73","getPair","0x318ddd4d03d84A40cf44772385A0CFB3D4394049","0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777"],"raw_result":"0x61d89984e497aa3e17b129fd9e4b3ff3f40ada1d","result_hash":"1bdfec94ad37dba8d36d3dd40f1bd16416cda8822072cf57a14585dd2e31ec8c","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","symbol()"],"raw_result":"Some(\"UMCon\")","result_hash":"5277018bd3790ebab543d271ef7bba2ab8cc2d7846152d541bc831927b94a7ab","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","balanceOf","0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D"],"raw_result":"Some(\"4242874299541616084\")","result_hash":"c3523eb9dec12513685475774cc9130eda948977b4f929efa1c84e2d5be63115","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","symbol()"],"raw_result":"Some(\"SCI6900\")","result_hash":"0631fbe46f4aea06be8c93c6c805a5449ac6a95963f152374639297f290431fd","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","balanceOf","0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D"],"raw_result":"Some(\"10743600160675623421089659\")","result_hash":"c1b5204875144672eec4b7e71334d94b2200aa69807d2dca322d3cf4967ab2b7","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","symbol()"],"raw_result":"Some(\"SCI6900\")","result_hash":"0631fbe46f4aea06be8c93c6c805a5449ac6a95963f152374639297f290431fd","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","name()"],"raw_result":"Some(\"上证综合指数69000\")","result_hash":"635a4227e92b1e6e3f129dbdc8734d3bba58f49aca7aca4a382b0508d5f824cc","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x372d9b65624D6E9B7E839D5D8E4561a7Aff57777","totalSupply()"],"raw_result":"Some(\"1000000000000000000000000000\")","result_hash":"9a5063c327faec672db6b50450571675cbfbcc3766ebaf6832c3a9f6636ff4d0","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","symbol()"],"raw_result":"Some(\"UMCon\")","result_hash":"5277018bd3790ebab543d271ef7bba2ab8cc2d7846152d541bc831927b94a7ab","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","name()"],"raw_result":"Some(\"United Microelectronics (Ondo Tokenized)\")","result_hash":"e40d092b31bff0d1735715d9786a8b072fbcf30fe5c2f269ef93a4f83e257b48","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","totalSupply()"],"raw_result":"Some(\"137098338018591203327\")","result_hash":"ad6c42003cb623f48c31c94aa24a5259d8c6df5acd1535f06f335f45596e5bdd","slot":null},{"block":null,"method":"eth_getCode","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null},{"block":null,"method":"eth_getCode","params":["0x318ddd4d03d84A40cf44772385A0CFB3D4394049","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null}],"registry_entry":{"chain":"bnb","contract":"0x318ddd4d03d84A40cf44772385A0CFB3D4394049","decimals":null,"issuer":"Ondo","last_checked":"2026-10-21T20:04:12Z","name":"United Microelectronics (Ondo Tokenized)","official_deployments":[{"address":"0x9784508a0758cBb43eCb9b62F4CF4b1b3a36480c","network":"Ethereum"},{"address":"0x318ddd4d03d84A40cf44772385A0CFB3D4394049","network":"BNB Chain"},{"address":"ieocA48cBX3oiVECgosMGxG649wnf7R8EkVrA5fondo","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":"UMC"},"registry_hash":"f5055f3fd8e05edd0e54918d9b962b6526b84392d15389a38044723a40f277fa","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x61d89984E497aA3E17b129fD9E4b3fF3f40ADa1D","ticker":"UMC","verdict":{"Verified":{"issuer":"Ondo","ticker":"UMC"}},"version":1}

Signature

KwQahNk+ytqrw44reqhh13PMg9bNIMGaC1DA7jYw+aR/pDvys9+dR1gd8coJu+x8Po9A+Jut6GRMm+Bnl/50AA==

API call

GET /api/attest/0b2b3e6dcdf3243f9a9453039cafd3abc7ddce12b3041f6fceee21d26c7a6bf5

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.