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":128391932,"chain":"bnb","checked_at":"2026-10-18T16:10:43Z","dev":false,"expires_at":"2026-10-19T16:10:43Z","issuer":"Ondo","pool":{"base":{"address":"0x0cdE6936d305d5B34667fC46425E852efd73559a","balance":"1344416594595841890","decimals":18,"symbol":"QQQon"},"chain":"bnb","dex":"pancake-v3","pool":"0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","quote":{"address":"0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","balance":"831493322716872590005","decimals":18,"symbol":"USDC"}},"quote_share_of_supply":0.00015590385417150107,"reads":[{"block":128391932,"method":"eth_blockNumber","params":[],"result_hash":"3b2284a1eded7680bb1dea6362bf93e6ff4fdfbe4ca35dede5ca0d65674232ba","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(\"1344416594595841890\")","result_hash":"b7a729910ebd788e2b7f89f1efaf049f45f17d88d584bb14ad1382525e334eea","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(\"831493322716872590005\")","result_hash":"8e095187d11d003bb3c8872d997aa237019fe08e1572822ce60ac1f450894c14","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(\"8623369843807226560416\")","result_hash":"a5d795b4e04f12d1dab436abbaddcd53e7b511d121a36480f358494d94e6ebb8","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":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x9e1d24dEe1dddB38658dd3ECe97fA7A6D3E0634a","ticker":"QQQ","verdict":{"Verified":{"issuer":"Ondo","ticker":"QQQ"}},"version":1}

Signature

t4WKvj5w2fgt/4v2Vxry30wWAORda4mTIplzxDyNrf+Vb/FZOKPq/JL2BCDAC0/4MsikxIyE8joQCmqM+INuBQ==

API call

GET /api/attest/0959e39cbd9d91bd71be9c4c3eda790f4caedd5c52737c7d84533ee9126cdd45

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.