Does RCAT / 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":91899796,"chain":"robinhood","checked_at":"2026-10-18T16:09:10Z","dev":false,"expires_at":"2026-10-19T16:09:10Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"447935829","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0x64710a70839585Af718e1B1FAEf9E7f1665F1116","quote":{"address":"0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","balance":"5244076428634136160079","decimals":18,"symbol":"RCAT"}},"quote_share_of_supply":0.25587056452073775,"reads":[{"block":91899796,"method":"eth_blockNumber","params":[],"result_hash":"de9b52bedeeb72cddb74e9d9c7a4a6c2805227ee3a9ae7a66c555265142dc1c8","slot":null},{"block":null,"method":"eth_call","params":["0x64710a70839585Af718e1B1FAEf9E7f1665F1116","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x64710a70839585Af718e1B1FAEf9E7f1665F1116","token1()"],"raw_result":"0xfde6b5d9bb419b10c23268c74e369abff39c0460","result_hash":"2e36384b89824873c74c681bd3ae9e1bf5e03b8ec35f1dc467348c1458708e18","slot":null},{"block":null,"method":"eth_call","params":["0x64710a70839585Af718e1B1FAEf9E7f1665F1116","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x64710a70839585Af718e1B1FAEf9E7f1665F1116","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x64710a70839585Af718e1B1FAEf9E7f1665F1116","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0x64710a70839585Af718e1B1FAEf9E7f1665F1116","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","0x2710"],"raw_result":"0x64710a70839585af718e1b1faef9e7f1665f1116","result_hash":"f143fbb3a90e1674c534dc568aef99c9a1966daeb005993441ea4cf3e38cef07","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","0x64710a70839585Af718e1B1FAEf9E7f1665F1116"],"raw_result":"Some(\"447935829\")","result_hash":"689387232d1d7ae3b6d47c9fd9e0db0adbed335fcbed70cb2027f920d99eda2c","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","symbol()"],"raw_result":"Some(\"RCAT\")","result_hash":"412e075e1c836758ec1052f62389896b37f6d452ce159125bd9cccddc8cf7aab","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","balanceOf","0x64710a70839585Af718e1B1FAEf9E7f1665F1116"],"raw_result":"Some(\"5244076428634136160079\")","result_hash":"e09de4a7da3f12f688159ec4fa1aa7854367a8a3f4d67ef34f00da0de51d4cde","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(\"696780276174599\")","result_hash":"c7ce061585956682a5202683b0b90c38301e136eef84dda80c269326a2d3ed55","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","symbol()"],"raw_result":"Some(\"RCAT\")","result_hash":"412e075e1c836758ec1052f62389896b37f6d452ce159125bd9cccddc8cf7aab","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","name()"],"raw_result":"Some(\"Red Cat • Robinhood Token\")","result_hash":"a87d2f826f9c6a12fe1f81979dc690b15761b800707345b9408eb005c5e41005","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","totalSupply()"],"raw_result":"Some(\"20495035990000000000000\")","result_hash":"27ea14cd96618b52bd98f7a416b10e354526a0742a8ae9200e199df467079080","slot":null},{"block":null,"method":"eth_call","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T15:47:33Z","name":"Red Cat","official_deployments":[{"address":"0xFDE6b5d9BB419B10C23268c74e369AbFF39C0460","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"RCAT"},"registry_hash":"2bf13ff4020924ba1c74d8e732c3dd1609679a3b9a6dc8a796250beb0ae1b589","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x64710a70839585Af718e1B1FAEf9E7f1665F1116","ticker":"RCAT","verdict":{"Verified":{"issuer":"Robinhood","ticker":"RCAT"}},"version":1}

Signature

uYdwKpST65Un0211OVgM6Mz+2k1dEEkIu6Uz9z9AR1yxCIvGwyYOPRPV25xliIPjPO/sa6L2KlZP6pDO3WwmCQ==

API call

GET /api/attest/27973fced7af95f34013e9c352555b8e60d64bf4e232345f9cdeeadf47c01745

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.