Does UPS / 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":91679207,"chain":"robinhood","checked_at":"2026-10-18T09:54:22Z","dev":false,"expires_at":"2026-10-19T09:54:22Z","issuer":"Robinhood","pool":{"base":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"10849099329","decimals":6,"symbol":"USDG"},"chain":"robinhood","dex":"uniswap-v3","pool":"0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","quote":{"address":"0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","balance":"237113138242894460423","decimals":18,"symbol":"UPS"}},"quote_share_of_supply":0.14666306678742916,"reads":[{"block":91679207,"method":"eth_blockNumber","params":[],"result_hash":"d6183dc1482789c1e1450c7d14619bb016d0258ba3049c76859145d1ca957282","slot":null},{"block":null,"method":"eth_call","params":["0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","token0()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","token1()"],"raw_result":"0xf23250dac154d05bb671cb0d0ebef3c635c79ce2","result_hash":"276a628e6543a03e8b6cdef1e19051b87a3439d9f1b5f18e2e7a50a8393323cd","slot":null},{"block":null,"method":"eth_call","params":["0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","0x2710"],"raw_result":"0x3ab74c45dcecc6a62898204dd42143a816b44cb1","result_hash":"1368f1d0204a27d68d1c1b19cb28c5e8915a0732d7fcf5f105f6fa3ff272af2e","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","0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1"],"raw_result":"Some(\"10849099329\")","result_hash":"f70e0023e70e547131f88cff8a17c573bac3da1ad7218e25fe8aa02d01232953","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","symbol()"],"raw_result":"Some(\"UPS\")","result_hash":"49f09aff546981df867f7141521a2796d2cf436b8926831be6de58a06aa1a4e9","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","balanceOf","0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1"],"raw_result":"Some(\"237113138242894460423\")","result_hash":"069e35099d576cc3a1e2ea34f59d4735d33a7cad9f1ce68bcd703eb2fa1abdca","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":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","symbol()"],"raw_result":"Some(\"UPS\")","result_hash":"49f09aff546981df867f7141521a2796d2cf436b8926831be6de58a06aa1a4e9","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","name()"],"raw_result":"Some(\"UPS • Robinhood Token\")","result_hash":"a4574a9dac32d19b16ce916cc89d5d05adcabb6241c4fcd627c532c5f4ace41b","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","totalSupply()"],"raw_result":"Some(\"1616720169820000000000\")","result_hash":"766151126213d46b0066c0132572145029e50d96076081fe7fb979d262aa7c6d","slot":null},{"block":null,"method":"eth_call","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","uiMultiplier()"],"raw_result":"1002208724969205741","result_hash":"ea406cc49c79fc37e4b32fb00894393503cd98712839632911cbea552b7c074f","slot":null},{"block":null,"method":"eth_getCode","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T09:47:33Z","name":"UPS","official_deployments":[{"address":"0xf23250dac154D05Bb671CB0d0eBEf3c635c79CE2","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"UPS"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0x3Ab74C45DceCC6A62898204Dd42143a816B44CB1","ticker":"UPS","verdict":{"Verified":{"issuer":"Robinhood","ticker":"UPS"}},"version":1}

Signature

lmXZo0e/3pg2yMJMu6hMTOINfm1a+nKmzPL0Mga72JxqYGg7H//05wjdqB7fjgGDx0M5CYbAQxh5bBs/IO9SAw==

API call

GET /api/attest/2acb9bf0d4f4bc43080452e808da5eb4a5624834a62007ce12c7862a2247f11c

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.