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":129730022,"chain":"bnb","checked_at":"2026-10-25T15:30:37Z","dev":false,"expires_at":"2026-10-26T15:30:37Z","issuer":"Ondo","pool":{"base":{"address":"0x0cdE6936d305d5B34667fC46425E852efd73559a","balance":"271214152885662052","decimals":18,"symbol":"QQQon"},"chain":"bnb","dex":"uniswap-v3","pool":"0xE59dC391582Bd70210B917b7E6e526F7f7464b76","quote":{"address":"0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","balance":"202721827122139927488","decimals":18,"symbol":"USDC"}},"quote_share_of_supply":0.00002751164739560156,"reads":[{"block":129730022,"method":"eth_blockNumber","params":[],"result_hash":"6959e3c5e4c142e56a45cda8e156d63b8db1b9714f60d25700085f32588a4d29","slot":null},{"block":null,"method":"eth_call","params":["0xE59dC391582Bd70210B917b7E6e526F7f7464b76","token0()"],"raw_result":"0x0cde6936d305d5b34667fc46425e852efd73559a","result_hash":"eeb5dea7f85cfa606c262dbd896b04b547635c07a61102058b11cc80c61549e8","slot":null},{"block":null,"method":"eth_call","params":["0xE59dC391582Bd70210B917b7E6e526F7f7464b76","token1()"],"raw_result":"0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d","result_hash":"424d2bace0b0ed07b1b8b1ffcde822b5bf8fb778b9576ac91a29044e745e08f9","slot":null},{"block":null,"method":"eth_call","params":["0xE59dC391582Bd70210B917b7E6e526F7f7464b76","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xE59dC391582Bd70210B917b7E6e526F7f7464b76","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xE59dC391582Bd70210B917b7E6e526F7f7464b76","factory()"],"raw_result":"0xdb1d10011ad0ff90774d0c6bb92e5c5c8b4461f7","result_hash":"4b482521d7cb760d72486691996fad9e93bcdcc2309e6fc4881175fe267d7fec","slot":null},{"block":null,"method":"eth_call","params":["0xE59dC391582Bd70210B917b7E6e526F7f7464b76","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0xdB1d10011AD0Ff90774D0C6Bb92e5C5c8b4461F7","getPool","0x0cdE6936d305d5B34667fC46425E852efd73559a","0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","0xbb8"],"raw_result":"0xe59dc391582bd70210b917b7e6e526f7f7464b76","result_hash":"1315efed4c4a5420c972f05beed35c0c7831de10d4647eb56569ed359008885a","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","0xE59dC391582Bd70210B917b7E6e526F7f7464b76"],"raw_result":"Some(\"271214152885662052\")","result_hash":"99168e429bdce507b97c2dccb0c6f74cbdfc507edd92203ee06cd50d828a1721","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","0xE59dC391582Bd70210B917b7E6e526F7f7464b76"],"raw_result":"Some(\"202721827122139927488\")","result_hash":"293e1bf5a573668818abd08ac7e7900012b84b1fb17468d77b910ca81683e4ea","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(\"9858157491834625457091\")","result_hash":"51885e7f8b9db8e3bfd6cb784aa66747b0a8ba13b8d9bc7fdee062c6441665db","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":"2026-10-24T22:15:13Z","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":"98bb6f78096c59a76dd6f15e8419debbea1fd65d8519339f2042bc59339b35f8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xE59dC391582Bd70210B917b7E6e526F7f7464b76","ticker":"QQQ","verdict":{"Verified":{"issuer":"Ondo","ticker":"QQQ"}},"version":1}

Signature

/8pbcgojVXgGBvkqXP+9d7WVuUbH1QU1vC16NCWEn1E4/dlaUqW1Nv1Ay3W++STBnUjKNQumB+bR1IfotLvvDw==

API call

GET /api/attest/b19daac5393d4249c6b8a1dc48854e0254da116c1f084be686d40327b5183720

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.