Does GLD / 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":91676727,"chain":"robinhood","checked_at":"2026-10-18T09:50:08Z","dev":false,"expires_at":"2026-10-19T09:50:08Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"450770918985","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","quote":{"address":"0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","balance":"2716224553364028332555","decimals":18,"symbol":"GLD"}},"quote_share_of_supply":0.13541387339593847,"reads":[{"block":91676727,"method":"eth_blockNumber","params":[],"result_hash":"84ab85254e66573e81875fd6d3bedc9e762e4d33cfdeab36fb753562c209db01","slot":null},{"block":null,"method":"eth_call","params":["0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","token1()"],"raw_result":"0xc9a981fee1f9dec688bb123ccdecc63d0debfc4e","result_hash":"99aa527799a5c0da77c5cfd6d7c1de5bafb9738bcb6da370d88445bccfbf03c2","slot":null},{"block":null,"method":"eth_call","params":["0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","fee()"],"raw_result":"500","result_hash":"5ac95f46dcda9e6a85f4d281cd691aea7b00846d8f8612d198d396136e9c5140","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xC9a981FEE1F9DEc688bb123ccDeCc63D0deBFC4e","0x1f4"],"raw_result":"0xba2f1ed4ceb2169d538d1e614d847e83c5a55913","result_hash":"ee89a0bb3bf00d12922e0f9497dc754d8cdcef74e7d543cbdbb3d37acf36ac64","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","0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913"],"raw_result":"Some(\"450770918985\")","result_hash":"6a2dd5d822e00b3069421ef92d3d6ab3420ae758cdd5320fe68531b3ea8d868b","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","0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913"],"raw_result":"Some(\"2716224553364028332555\")","result_hash":"e56ed6995a88d9df83c87ed14a4b02ddc2768b585cf2e20f7a80130bb2dc4932","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(\"696510571472896\")","result_hash":"3bf47cc44e79235c2a4786a9e16c733cbbc4aa81b60a1a84187551f9e56b0257","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":"2026-10-18T09:47:33Z","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":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xBA2f1ed4cEB2169D538d1e614D847E83C5A55913","ticker":"GLD","verdict":{"Verified":{"issuer":"Robinhood","ticker":"GLD"}},"version":1}

Signature

ZnCTFBf2DXOLKrofDAyw9yWat7UST1iVO/JIH5Zj8Q1/tj4Q5hoRBzylZ3BqnDLglcINliwYo2JncckKL+d/DQ==

API call

GET /api/attest/2158bb112c6b17c1f3a747a3850bd952bcd6b0db844548b869f4c5b56d67b95d

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.