Does SLVon / 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":128478692,"chain":"bnb","checked_at":"2026-10-19T03:01:36Z","dev":false,"expires_at":"2026-10-20T03:01:36Z","issuer":"Ondo","pool":{"base":{"address":"0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","balance":"4718412686778468470364","decimals":18,"symbol":"USDC"},"chain":"bnb","dex":"uniswap-v3","pool":"0x3127Aa62B75a3554D96f863e10c41A5e77971B44","quote":{"address":"0x8b872732b07be325a8803CDB480D9d20B6f8d11B","balance":"569971170929534882417","decimals":18,"symbol":"SLVon"}},"quote_share_of_supply":0.006466301151201073,"reads":[{"block":128478692,"method":"eth_blockNumber","params":[],"result_hash":"5061cf06cc249bbcea64fa6d6de36ac74a250094dd249da8c92d196e47dba640","slot":null},{"block":null,"method":"eth_call","params":["0x3127Aa62B75a3554D96f863e10c41A5e77971B44","token0()"],"raw_result":"0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d","result_hash":"424d2bace0b0ed07b1b8b1ffcde822b5bf8fb778b9576ac91a29044e745e08f9","slot":null},{"block":null,"method":"eth_call","params":["0x3127Aa62B75a3554D96f863e10c41A5e77971B44","token1()"],"raw_result":"0x8b872732b07be325a8803cdb480d9d20b6f8d11b","result_hash":"b1627688a3f4e79bb02c0102ffd206e2a4daabc44ac6887c752a9ba8e3aad253","slot":null},{"block":null,"method":"eth_call","params":["0x3127Aa62B75a3554D96f863e10c41A5e77971B44","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x3127Aa62B75a3554D96f863e10c41A5e77971B44","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x3127Aa62B75a3554D96f863e10c41A5e77971B44","factory()"],"raw_result":"0xdb1d10011ad0ff90774d0c6bb92e5c5c8b4461f7","result_hash":"4b482521d7cb760d72486691996fad9e93bcdcc2309e6fc4881175fe267d7fec","slot":null},{"block":null,"method":"eth_call","params":["0x3127Aa62B75a3554D96f863e10c41A5e77971B44","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0xdB1d10011AD0Ff90774D0C6Bb92e5C5c8b4461F7","getPool","0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d","0x8b872732b07be325a8803CDB480D9d20B6f8d11B","0x2710"],"raw_result":"0x3127aa62b75a3554d96f863e10c41a5e77971b44","result_hash":"b26e3648ad2a8a80204e30bb513a0d4c8f20cbdff5fd15d93fdb7d9081c31ab2","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","0x3127Aa62B75a3554D96f863e10c41A5e77971B44"],"raw_result":"Some(\"4718412686778468470364\")","result_hash":"a4edc145133422283ef0fa5105a17fd2c97ab71f10c741d9cb8485c4eba7067b","slot":null},{"block":null,"method":"eth_call","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","symbol()"],"raw_result":"Some(\"SLVon\")","result_hash":"99db1e89a4b78f7aadae99860664e4f77795d4e6a28d3a9095742eaba3e07772","slot":null},{"block":null,"method":"eth_call","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","balanceOf","0x3127Aa62B75a3554D96f863e10c41A5e77971B44"],"raw_result":"Some(\"569971170929534882417\")","result_hash":"625ee92f4545d8f1dbe21192a41f944efc33a268a5bf35351410f057ca7cf9d6","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":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","symbol()"],"raw_result":"Some(\"SLVon\")","result_hash":"99db1e89a4b78f7aadae99860664e4f77795d4e6a28d3a9095742eaba3e07772","slot":null},{"block":null,"method":"eth_call","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","name()"],"raw_result":"Some(\"iShares Silver Trust (Ondo Tokenized)\")","result_hash":"653cc96a036e6b5ffa913a79c390d9e15f05a89a7788f88024064b1feb9e3620","slot":null},{"block":null,"method":"eth_call","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","totalSupply()"],"raw_result":"Some(\"88144854005704099209162\")","result_hash":"98161b79acd95025fa52b01fca09bbb7e4239aa15af724be03356bfd6175e641","slot":null},{"block":null,"method":"eth_getCode","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null},{"block":null,"method":"eth_getCode","params":["0x8b872732b07be325a8803CDB480D9d20B6f8d11B","latest"],"result_hash":"94608f5be99dad7eba2f1291156fff602e3d7e462e4517d8f65af38ba0f4b7b4","slot":null}],"registry_entry":{"chain":"bnb","contract":"0x8b872732b07be325a8803CDB480D9d20B6f8d11B","decimals":null,"issuer":"Ondo","last_checked":"2026-10-18T20:40:22Z","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":"0bd20861acb250fc115ebe98f0dbbb7c686b15c772a071c9020aa5154f2d195f","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x3127Aa62B75a3554D96f863e10c41A5e77971B44","ticker":"SLV","verdict":{"Verified":{"issuer":"Ondo","ticker":"SLV"}},"version":1}

Signature

yzdkON3Z2+EPxfcaSOhgeExQCUsdYQsxN5hdivNjFKZlvNc/Wwxu4XqRIOFz+RLdHjrsPj7DSR8Vx9O8Nee2Ag==

API call

GET /api/attest/6346e596146bc7ba65f3cdc14fdd382bca0ac95f6c58ea907ba9c9e158efb582

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.