Does SLV / USDG 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":94548521,"chain":"robinhood","checked_at":"2026-10-21T20:08:07Z","dev":false,"expires_at":"2026-10-22T20:08:07Z","issuer":"Robinhood","pool":{"base":{"address":"0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","balance":"5242256860610998050917","decimals":18,"symbol":"SLV"},"chain":"robinhood","dex":"uniswap-v3","pool":"0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"72111477572","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.2472540864523294,"reads":[{"block":94548521,"method":"eth_blockNumber","params":[],"result_hash":"f898a359132797fcfa546408f7c42e4c0f04fa8ff8b68f77be54c3006e81e45b","slot":null},{"block":null,"method":"eth_call","params":["0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","token0()"],"raw_result":"0x411efb0e7f985935daec3d4c3ebaea0d0ad7d89f","result_hash":"68ea7d82d8ecae834141020d36f43c8cb636a51e54cd1bf826ec1ba0d6bf7d35","slot":null},{"block":null,"method":"eth_call","params":["0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xbb8"],"raw_result":"0x8cb787e6c315d464775289bad00fdd67d53ecb3d","result_hash":"6a25186991f429c7482ffec538c16dee619f536a31e275164354c7d67beb4a76","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","symbol()"],"raw_result":"Some(\"SLV\")","result_hash":"159cab2f29b4dfdcdd3503817cf48bfb9c6338be9b44fe1eae0c811a72875fc1","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","balanceOf","0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D"],"raw_result":"Some(\"5242256860610998050917\")","result_hash":"624fe88c5105e0f40c80572ab3134af4e5dd3ff492d6c17f666e16f04a5be412","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","symbol()"],"raw_result":"Some(\"USDG\")","result_hash":"5cbfd9547b12ffd28d96e5f55c97290c4f230a8d7ad7bbe91dc15f2e61c1a3c5","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balanceOf","0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D"],"raw_result":"Some(\"72111477572\")","result_hash":"5e53cbb8e1f87612554edf36618c68a0a4fec0f80d0b8eb3a434370a34308a4b","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","symbol()"],"raw_result":"Some(\"USDG\")","result_hash":"5cbfd9547b12ffd28d96e5f55c97290c4f230a8d7ad7bbe91dc15f2e61c1a3c5","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","name()"],"raw_result":"Some(\"Global Dollar\")","result_hash":"e34c795a5a7df6a2269bde7247321204357731d7742ef5974b04eb6899db8b11","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","totalSupply()"],"raw_result":"Some(\"714885538824893\")","result_hash":"69bbcacc9aa72f08d11e7637bdfd6eebb3635193d251b566e28846272befeaf1","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","symbol()"],"raw_result":"Some(\"SLV\")","result_hash":"159cab2f29b4dfdcdd3503817cf48bfb9c6338be9b44fe1eae0c811a72875fc1","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","name()"],"raw_result":"Some(\"iShares Silver Trust • Robinhood Token\")","result_hash":"d145e2d92fb209a313f83748b04260f91446ef62d849cd6f4d2c183e0b88671b","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","totalSupply()"],"raw_result":"Some(\"21201901800000000000000\")","result_hash":"62f22fc440fdc0be54a306a53135e3b46920854a3e34b8cd1aff3b2364f18160","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-21T20:04:09Z","name":"iShares Silver Trust","official_deployments":[{"address":"0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"SLV"},"registry_hash":"f5055f3fd8e05edd0e54918d9b962b6526b84392d15389a38044723a40f277fa","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x8cB787e6c315D464775289BaD00FDD67d53Ecb3D","ticker":"SLV","verdict":{"Verified":{"issuer":"Robinhood","ticker":"SLV"}},"version":1}

Signature

vjbqfUwqOVSNxF65LODIEPIaJX09MWmvNiQsR/0VgRbUcI7DQbf//wpUoSXJEvOXmHP6iha2f7T/vkgEJn9zBw==

API call

GET /api/attest/6e16bf80dbefc69ca36a6e6a9f68619c4f59151b3c91c825c285c81c1d65b2a2

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.