Does GLD / SLV 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":91999475,"chain":"robinhood","checked_at":"2026-10-18T18:57:46Z","dev":false,"expires_at":"2026-10-19T18:57:46Z","issuer":"Robinhood","pool":{"base":{"address":"0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","balance":"1948927892606039213731","decimals":18,"symbol":"SLV"},"chain":"robinhood","dex":"uniswap-v3","pool":"0x48Abc7052509cAF820C4C22559F08381f9AFD823","quote":{"address":"0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","balance":"62065888942665759938","decimals":18,"symbol":"GLD"}},"quote_share_of_supply":0.0030942148789132665,"reads":[{"block":91999475,"method":"eth_blockNumber","params":[],"result_hash":"ea24171c12ddfbb716bba3d5437091c63e499261df55fdf21760e2c3448743e1","slot":null},{"block":null,"method":"eth_call","params":["0x48Abc7052509cAF820C4C22559F08381f9AFD823","token0()"],"raw_result":"0x411efb0e7f985935daec3d4c3ebaea0d0ad7d89f","result_hash":"68ea7d82d8ecae834141020d36f43c8cb636a51e54cd1bf826ec1ba0d6bf7d35","slot":null},{"block":null,"method":"eth_call","params":["0x48Abc7052509cAF820C4C22559F08381f9AFD823","token1()"],"raw_result":"0xc9a981fee1f9dec688bb123ccdecc63d0debfc4e","result_hash":"99aa527799a5c0da77c5cfd6d7c1de5bafb9738bcb6da370d88445bccfbf03c2","slot":null},{"block":null,"method":"eth_call","params":["0x48Abc7052509cAF820C4C22559F08381f9AFD823","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x48Abc7052509cAF820C4C22559F08381f9AFD823","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x48Abc7052509cAF820C4C22559F08381f9AFD823","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0x48Abc7052509cAF820C4C22559F08381f9AFD823","fee()"],"raw_result":"500","result_hash":"5ac95f46dcda9e6a85f4d281cd691aea7b00846d8f8612d198d396136e9c5140","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","0x1f4"],"raw_result":"0x48abc7052509caf820c4c22559f08381f9afd823","result_hash":"ffbd798e6166dde111fb163a301ba613bf5f229ae6cfa10ba564d2e0287e150e","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","0x48Abc7052509cAF820C4C22559F08381f9AFD823"],"raw_result":"Some(\"1948927892606039213731\")","result_hash":"76cea5c90d7bfe2abb74a8f850b070aa046ad59218e14af9f309670dd18ff237","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","symbol()"],"raw_result":"Some(\"GLD\")","result_hash":"b3bfe63bf387db068fb1b240a7b959fa983a7df54741c9264d1993cd7cc1fcc7","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","balanceOf","0x48Abc7052509cAF820C4C22559F08381f9AFD823"],"raw_result":"Some(\"62065888942665759938\")","result_hash":"efa654a23bfc1d02623328ffdacdc8b3c28780c54155e0a1bf643773b6f7d615","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(\"21994190530000000000000\")","result_hash":"97ea4cfeda03ff1763b666e8c084f2c5315236551d429edfd22ad2bfc89fcb8d","slot":null},{"block":null,"method":"eth_call","params":["0x411eFb0E7f985935DAec3D4C3ebaEa0d0AD7D89f","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","symbol()"],"raw_result":"Some(\"GLD\")","result_hash":"b3bfe63bf387db068fb1b240a7b959fa983a7df54741c9264d1993cd7cc1fcc7","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","name()"],"raw_result":"Some(\"SPDR Gold Trust • Robinhood Token\")","result_hash":"f93e660f129f86e8187e4fb708f6fc96e69642a7305f8b2289053bf57013c23b","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","totalSupply()"],"raw_result":"Some(\"20058687380000000000000\")","result_hash":"487ecb18e09e87dda5af19d68d248ab7873a244e7d326d3ce7faef8787b4f71c","slot":null},{"block":null,"method":"eth_call","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T18:54:09Z","name":"SPDR Gold Trust","official_deployments":[{"address":"0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"GLD"},"registry_hash":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x48Abc7052509cAF820C4C22559F08381f9AFD823","ticker":"GLD","verdict":{"Verified":{"issuer":"Robinhood","ticker":"GLD"}},"version":1}

Signature

yXrkjBB54/pleB6JgjJsLJa+tVuIYt4yv2ch/9w5bbDXyMCpxUVR64goqTU2LPdH8wR5HjTEdy6lO7001YoSAg==

API call

GET /api/attest/55480438437a2857b1d1818ef461440775b891bdfc49f65e57fa82b4b2982d54

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.