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":91999811,"chain":"robinhood","checked_at":"2026-10-18T18:58:21Z","dev":false,"expires_at":"2026-10-19T18:58:21Z","issuer":"Robinhood","pool":{"base":{"address":"0x5e81213613b6B86EaB4c6c50d718d34359459786","balance":"708767997589418244238","decimals":18,"symbol":"TTWO"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"25700623589","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.12670829236123274,"reads":[{"block":91999811,"method":"eth_blockNumber","params":[],"result_hash":"c4e048aefaa0a8c463eb8af11e97e722a52a32054d72084d6f99d2f93e06c6da","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(\"708767997589418244238\")","result_hash":"406f22f2e31bf6a49d98689cd5b0d9d3037abbff66da1f1c1a882f5d68b6152a","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(\"25700623589\")","result_hash":"366e1e2c8f57981a05de58b8c1fcce9322ad91b0d0aaa4d3bf1e6b929da7be99","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(\"696496200347174\")","result_hash":"c89de63b57cbd2df29547c452103566aa72dd3f4abac92a6142add18e0bbbedd","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":"2026-10-18T18:54:09Z","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":"e40a8f7ec2f1a2c1d6467a45e0976602299513549c0406d646df02a3ecb928c8","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xD9Ab4b7fAe6DC2f7020134Ec744A8F53Ef3E5E24","ticker":"TTWO","verdict":{"Verified":{"issuer":"Robinhood","ticker":"TTWO"}},"version":1}

Signature

phhYEYetMCoa+onEOyT26xM1IZBzRwSrjL0a5REZjQfEXxZr2ZUxl7iBTQnwlXSiD6KiGhNXdRxQLIDHYIutAg==

API call

GET /api/attest/2c7d508444f8ed6414373d1335351a3d10180c9ae1f942bc05604865830cf6b1

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.