Does QQQon / 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":128342580,"chain":"bnb","checked_at":"2026-10-18T10:00:26Z","dev":false,"expires_at":"2026-10-19T10:00:26Z","issuer":"Ondo","pool":{"base":{"address":"0x0cdE6936d305d5B34667fC46425E852efd73559a","balance":"1319518620313027520","decimals":18,"symbol":"QQQon"},"chain":"bnb","dex":"pancake-v3","pool":"0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","quote":{"address":"0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","balance":"849130494245032588050","decimals":18,"symbol":"USDC"}},"quote_share_of_supply":0.00015313759858895384,"reads":[{"block":128342580,"method":"eth_blockNumber","params":[],"result_hash":"414f1f0c56b938846961037506c2f17ac7b5cf87795a9e8054d02c18769e4523","slot":null},{"block":null,"method":"eth_call","params":["0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","token0()"],"raw_result":"0x0cde6936d305d5b34667fc46425e852efd73559a","result_hash":"eeb5dea7f85cfa606c262dbd896b04b547635c07a61102058b11cc80c61549e8","slot":null},{"block":null,"method":"eth_call","params":["0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","token1()"],"raw_result":"0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d","result_hash":"424d2bace0b0ed07b1b8b1ffcde822b5bf8fb778b9576ac91a29044e745e08f9","slot":null},{"block":null,"method":"eth_call","params":["0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","factory()"],"raw_result":"0x0bfbcf9fa4f9c56b0f40a671ad40e0805a091865","result_hash":"2e3d0bedb6ff98db8ecf6c7b57f2028219517abe46f0f5212ff489a2c45cafbd","slot":null},{"block":null,"method":"eth_call","params":["0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x0BFbCF9fa4f9C56B0F40a671Ad40E0805A091865","getPool","0x0cdE6936d305d5B34667fC46425E852efd73559a","0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","0x2710"],"raw_result":"0x9e1d24dee1dddb38658dd3ece97fa7a6d3e0634a","result_hash":"0de16fca815c3925800f3c88308a0a283c45cacd169a23aa4f8b726b903b6437","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","symbol()"],"raw_result":"Some(\"QQQon\")","result_hash":"e61d6e31908fc5406de6f2077544ca2a4a5521be9e390f0822d8173f453df37b","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","balanceOf","0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a"],"raw_result":"Some(\"1319518620313027520\")","result_hash":"7c9a1424f0b5b81bdc5491ea88d09482aa3c510452b250a42f545ad0e283ac59","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","balanceOf","0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a"],"raw_result":"Some(\"849130494245032588050\")","result_hash":"6050e0cfbd88bf747b26ef27c9a39a3ec6e50c8643a45ab3d2b342d520ead759","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","name()"],"raw_result":"Some(\"USD Coin\")","result_hash":"fe94af15dc887a2c9df1fb0d6d276e6c586ca9d430ffeac0d05e4baee0637fd1","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","totalSupply()"],"raw_result":"Some(\"1588999877439803986446539541\")","result_hash":"a30c1d43fabceb84630ef9005b0a2d92f1cf968832dce3f94a703b50f7d3caea","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","symbol()"],"raw_result":"Some(\"QQQon\")","result_hash":"e61d6e31908fc5406de6f2077544ca2a4a5521be9e390f0822d8173f453df37b","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","name()"],"raw_result":"Some(\"Invesco QQQ (Ondo Tokenized)\")","result_hash":"1546b962620e91b60fda0aac58012198c5fd3a5e910efa831383585023876703","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","totalSupply()"],"raw_result":"Some(\"8616555519163060967782\")","result_hash":"e8152027d59c080ebd9f77c2e2a37c8c900d55a46475bd821639b59d626e2d12","slot":null},{"block":null,"method":"eth_getCode","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null},{"block":null,"method":"eth_getCode","params":["0x0cdE6936d305d5B34667fC46425E852efd73559a","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null}],"registry_entry":{"chain":"bnb","contract":"0x0cdE6936d305d5B34667fC46425E852efd73559a","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T09:47:35Z","name":"Invesco QQQ (Ondo Tokenized)","official_deployments":[{"address":"0x0e397938C1Aa0680954093495B70A9F5e2249aBa","network":"Ethereum"},{"address":"0x0cdE6936d305d5B34667fC46425E852efd73559a","network":"BNB Chain"},{"address":"HrYNm6jTQ71LoFphjVKBTdAE4uja7WsmLG8VxB8ondo","network":"Solana"},{"address":"0x911e2dCD2b70F44231F3F0f1C6ec9aF75068FD85","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":"QQQ"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","ticker":"QQQ","verdict":{"Verified":{"issuer":"Ondo","ticker":"QQQ"}},"version":1}

Signature

9W0cY/9spI+AQPqNesecYfboD+fIxEXl9CPRwjcCeYQXdqY/PIdnna0p8ZdW0uSZYFvo9Owfr0VYKvdGs/KIBg==

API call

GET /api/attest/0830a7d707f99cafac690ecb12aaf9ee313367cbb7f2641eb63fb22089a52cdc

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.