Does SLVon / USDT 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":26218684,"chain":"ethereum","checked_at":"2026-10-18T09:55:29Z","dev":false,"expires_at":"2026-10-19T09:55:29Z","issuer":"Ondo","pool":{"base":{"address":"0xdAC17F958D2ee523a2206206994597C13D831ec7","balance":"4879857381","decimals":6,"symbol":"USDT"},"chain":"ethereum","dex":"uniswap-v3","pool":"0x9B727C74e881433D05E536FD95e516673D1028EA","quote":{"address":"0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","balance":"2267900515337981412872","decimals":18,"symbol":"SLVon"}},"quote_share_of_supply":0.006381566366112888,"reads":[{"block":26218684,"method":"eth_blockNumber","params":[],"result_hash":"87af768eda2c7536ea5043cd5e5a1a2f2ce7d074a901b40b03c1b6047d88b314","slot":null},{"block":null,"method":"eth_call","params":["0x9B727C74e881433D05E536FD95e516673D1028EA","token0()"],"raw_result":"0xdac17f958d2ee523a2206206994597c13d831ec7","result_hash":"4deb67031fd9d1a1f47c98d5bd6a714bdab41f25c93d4ed6ca6e8767a5ec93e8","slot":null},{"block":null,"method":"eth_call","params":["0x9B727C74e881433D05E536FD95e516673D1028EA","token1()"],"raw_result":"0xf3e4872e6a4cf365888d93b6146a2baa7348f1a4","result_hash":"05977a9c1ef17c65704aef3634dca421b7f3d1eba865164e97523348e57e5f8a","slot":null},{"block":null,"method":"eth_call","params":["0x9B727C74e881433D05E536FD95e516673D1028EA","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x9B727C74e881433D05E536FD95e516673D1028EA","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x9B727C74e881433D05E536FD95e516673D1028EA","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0x9B727C74e881433D05E536FD95e516673D1028EA","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0xdAC17F958D2ee523a2206206994597C13D831ec7","0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","0xbb8"],"raw_result":"0x9b727c74e881433d05e536fd95e516673d1028ea","result_hash":"a5a43e4460acc98793db476ad1d000e58fdae2ec41d109ed8389ee5c287e1d51","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","symbol()"],"raw_result":"Some(\"USDT\")","result_hash":"a851493323e1198c0940c2b2ca5c59e97da9c6f50f63f0c09779709ef2572f84","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","balanceOf","0x9B727C74e881433D05E536FD95e516673D1028EA"],"raw_result":"Some(\"4879857381\")","result_hash":"0361afd3eab2a1a678093e9890278575d9ca7db39fd0002e151d82c863651db6","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","symbol()"],"raw_result":"Some(\"SLVon\")","result_hash":"99db1e89a4b78f7aadae99860664e4f77795d4e6a28d3a9095742eaba3e07772","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","balanceOf","0x9B727C74e881433D05E536FD95e516673D1028EA"],"raw_result":"Some(\"2267900515337981412872\")","result_hash":"9379f7b24ecc3a3c652a7dfaca1c758a803989974064f698399026d881fa0074","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","symbol()"],"raw_result":"Some(\"USDT\")","result_hash":"a851493323e1198c0940c2b2ca5c59e97da9c6f50f63f0c09779709ef2572f84","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","name()"],"raw_result":"Some(\"Tether USD\")","result_hash":"8f7cfea6e15ea5712d4bf603e3223e8de9dfdee3c5fe9a25ec1181218bd425ad","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xdAC17F958D2ee523a2206206994597C13D831ec7","totalSupply()"],"raw_result":"Some(\"88302633055702652\")","result_hash":"028899d5036e327561a1b8b5f14461b24862ba6bd517bcebd1cc98ba9879d3ac","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","symbol()"],"raw_result":"Some(\"SLVon\")","result_hash":"99db1e89a4b78f7aadae99860664e4f77795d4e6a28d3a9095742eaba3e07772","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","name()"],"raw_result":"Some(\"iShares Silver Trust (Ondo Tokenized)\")","result_hash":"653cc96a036e6b5ffa913a79c390d9e15f05a89a7788f88024064b1feb9e3620","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","totalSupply()"],"raw_result":"Some(\"355383049431388257212792\")","result_hash":"60d5decf6d24646d84eb200966e0798a47aab0769a629f6910a60c55c5f02543","slot":null},{"block":null,"method":"eth_getCode","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null},{"block":null,"method":"eth_getCode","params":["0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","latest"],"result_hash":"8538a8190a64db88a5e0ec4c95f0129f9eecd6f3a3aacb869262b82d01d123ec","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T09:47:35Z","name":"iShares Silver Trust (Ondo Tokenized)","official_deployments":[{"address":"0xF3e4872e6a4cF365888D93b6146a2bAA7348F1A4","network":"Ethereum"},{"address":"0x8b872732b07be325a8803CDB480D9d20B6f8d11B","network":"BNB Chain"},{"address":"iy11ytbSGcUnrjE6Lfv78TFqxKyUESfku1FugS9ondo","network":"Solana"},{"address":"0xd53d98d13D93C817011645442c2e4d46E499B460","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":"SLV"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x9B727C74e881433D05E536FD95e516673D1028EA","ticker":"SLV","verdict":{"Verified":{"issuer":"Ondo","ticker":"SLV"}},"version":1}

Signature

Ou5kZEIhbWl3qMB8ae1nihWYQCt22w3dq3WmmwHPUPHXG/UvPF5/WfBCZG81PSMGLmR9u8cymBadCfmkhWJNBg==

API call

GET /api/attest/23fc2229d8edb1cf9ff2c7195e62f826d58fdf36d189542994dbe3f5b9e36c92

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.