Does TTWO / 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":91678322,"chain":"robinhood","checked_at":"2026-10-18T09:52:51Z","dev":false,"expires_at":"2026-10-19T09:52:51Z","issuer":"Robinhood","pool":{"base":{"address":"0x5e81213613b6B86EaB4c6c50d718d34359459786","balance":"690850998690893598882","decimals":18,"symbol":"TTWO"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"29326202926","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.12350522401955902,"reads":[{"block":91678322,"method":"eth_blockNumber","params":[],"result_hash":"bf951b41969c0b8687f155a22a76c8b538244a4cb1c3b2ce8d2e2d69516d0e0c","slot":null},{"block":null,"method":"eth_call","params":["0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","token0()"],"raw_result":"0x5e81213613b6b86eab4c6c50d718d34359459786","result_hash":"aa19537f1edb113092c1f00e07e4ed62185e6474735b58844fd538bde5665168","slot":null},{"block":null,"method":"eth_call","params":["0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5e81213613b6B86EaB4c6c50d718d34359459786","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xbb8"],"raw_result":"0xd9ab4b7fae6dc2f7020134ec744a8f53ef3e5e24","result_hash":"b0c49a7e088ea9a2f9ef425e60c53d874ab29f544b05df86b81a3ba4ac683fdf","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","symbol()"],"raw_result":"Some(\"TTWO\")","result_hash":"011bbe1843e2cd6e762bc2515b49bdb54d29a101ac8df430ec35f48dbb7236cd","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","balanceOf","0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24"],"raw_result":"Some(\"690850998690893598882\")","result_hash":"da9f50c71c83825a0bb82b3c84a62dbf1c5db33f5b73e621aa038363d849d6e7","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","0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24"],"raw_result":"Some(\"29326202926\")","result_hash":"b681af1d5ecaf5ea2795155258573d7d07fe90284f6446b8738b08f71ef6b308","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":["0x5e81213613b6B86EaB4c6c50d718d34359459786","symbol()"],"raw_result":"Some(\"TTWO\")","result_hash":"011bbe1843e2cd6e762bc2515b49bdb54d29a101ac8df430ec35f48dbb7236cd","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","name()"],"raw_result":"Some(\"Take-Two Interactive Software • Robinhood Token\")","result_hash":"35c5f0cd9fc71dcccda2dc687c8ed8cb04c1d2ff176c89cccc3e931148ddb282","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","totalSupply()"],"raw_result":"Some(\"5593698600000000000000\")","result_hash":"2cf965fa3df08cfc1818ba20e8f86682b17083f52c5742901add9b8d056dcdcd","slot":null},{"block":null,"method":"eth_call","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x5e81213613b6B86EaB4c6c50d718d34359459786","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x5e81213613b6B86EaB4c6c50d718d34359459786","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T09:47:33Z","name":"Take-Two Interactive Software","official_deployments":[{"address":"0x5e81213613b6B86EaB4c6c50d718d34359459786","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"TTWO"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","ticker":"TTWO","verdict":{"Verified":{"issuer":"Robinhood","ticker":"TTWO"}},"version":1}

Signature

A82tGJHICFozvF4AlCwtm8PM3+JtqUepUhQQNRD7XdCwXpPuwoQofCiJtprwZM8DWqUnWYsKPZqnvBi9DLOtCA==

API call

GET /api/attest/6f0be9b471e7296c5a25598871af6efecf95bab54ef5fe7806977aace923ce62

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.