Does BB / 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":91679114,"chain":"robinhood","checked_at":"2026-10-18T09:54:12Z","dev":false,"expires_at":"2026-10-19T09:54:12Z","issuer":"Robinhood","pool":{"base":{"address":"0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","balance":"1780747988350042755850","decimals":18,"symbol":"BB"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xc424e56e816F148a8B30ccbde2128e04d21f51e9","quote":{"address":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","balance":"11940677558","decimals":6,"symbol":"USDG"}},"quote_share_of_supply":0.06819489388831285,"reads":[{"block":91679114,"method":"eth_blockNumber","params":[],"result_hash":"c6da639706547502ddde478e2784a2be8dafd13a790aebb7e156d5c5d0752099","slot":null},{"block":null,"method":"eth_call","params":["0xc424e56e816F148a8B30ccbde2128e04d21f51e9","token0()"],"raw_result":"0x48e39e56acdba37b09020c0b734a613c9a2f100a","result_hash":"8da4377f33417d03d6635ff807cac2cfed28bf4e923edc108fe017b6c399c03e","slot":null},{"block":null,"method":"eth_call","params":["0xc424e56e816F148a8B30ccbde2128e04d21f51e9","token1()"],"raw_result":"0x5fc5360d0400a0fd4f2af552add042d716f1d168","result_hash":"742eb919f060d78d6f55d9d90c592b8d91ea7358553fc7e37cb579cf21192137","slot":null},{"block":null,"method":"eth_call","params":["0xc424e56e816F148a8B30ccbde2128e04d21f51e9","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xc424e56e816F148a8B30ccbde2128e04d21f51e9","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xc424e56e816F148a8B30ccbde2128e04d21f51e9","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xc424e56e816F148a8B30ccbde2128e04d21f51e9","fee()"],"raw_result":"10000","result_hash":"328d48ab2376d2f42d3af5ba69086143c8f5fe883ed195a8280b2154a5711a33","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","0x2710"],"raw_result":"0xc424e56e816f148a8b30ccbde2128e04d21f51e9","result_hash":"c0da54611cfe9ab7db29de11bb87cab231c8f123ad953ba64f82409e6c98401e","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","symbol()"],"raw_result":"Some(\"BB\")","result_hash":"7501bc9b99edfe7e8307b10d95ee820ada4df2ba0fa1b95dad1d7dbe4759d68b","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","balanceOf","0xc424e56e816F148a8B30ccbde2128e04d21f51e9"],"raw_result":"Some(\"1780747988350042755850\")","result_hash":"48350c3900f226401b74c93ac2debe98112681dbfa78bd337c2c9d5561d26e12","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","0xc424e56e816F148a8B30ccbde2128e04d21f51e9"],"raw_result":"Some(\"11940677558\")","result_hash":"0bc544765478814f055c76b1b7c9b6e19c5ce099c4e80d1daaf7a57e70cb6671","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":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","symbol()"],"raw_result":"Some(\"BB\")","result_hash":"7501bc9b99edfe7e8307b10d95ee820ada4df2ba0fa1b95dad1d7dbe4759d68b","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","name()"],"raw_result":"Some(\"Blackberry • Robinhood Token\")","result_hash":"d8a3adf4a63d2c07dd9b4d0d2b2d2ffa99527842d71a1358f55b6460301c88a4","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","totalSupply()"],"raw_result":"Some(\"26112629360000000000000\")","result_hash":"18e774ca61c7d99f565a922b33fc200766f700d19a309040cf77ee12fdcd4520","slot":null},{"block":null,"method":"eth_call","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","uiMultiplier()"],"raw_result":"1000000000000000000","result_hash":"46754a2491051f216577f1b9f19516f9be1a28c62f023dcbabd8c5317cdefe4b","slot":null},{"block":null,"method":"eth_getCode","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T09:47:33Z","name":"Blackberry","official_deployments":[{"address":"0x48E39E56aCdbA37b09020C0b734A613C9a2f100A","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"BB"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xc424e56e816F148a8B30ccbde2128e04d21f51e9","ticker":"BB","verdict":{"Verified":{"issuer":"Robinhood","ticker":"BB"}},"version":1}

Signature

zaoXAZPIbfbrpXBVsQi+Ju34sYn55M1agH1BhKW+RG7WJezUJITXyvs5F4aQMPbm65YQoNXS0eXAiQbDtO0IBQ==

API call

GET /api/attest/37fec5ff1945e0139a6fffce168089ecf4368aff20d8084cfe0eafc83750518e

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.