BRK.Bx/Unknown

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":null,"chain":"Solana","checked_at":"2026-09-30T00:21:21Z","dev":false,"expires_at":"2026-10-01T00:21:21Z","issuer":"Backed xStocks","pool":{"base":{"address":"Xs6B6zawENwAbWVi7w92rjazLuAr5Az59qgWKcNb45x","balance":"14056049441","decimals":8,"symbol":"BRK.Bx"},"chain":"Solana","dex":"raydium-clmm","pool":"B4UdLnvzCrnfRndLdgGTYZjcKTDsaFKB54cmKb2GoSne","quote":{"address":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","balance":"30338174198","decimals":6,"symbol":null}},"quote_share_of_supply":0.004360402618319193,"reads":[{"block":null,"method":"getSlot","params":[{"commitment":"confirmed"}],"result_hash":"a95568b3f8122848d738c6bb812fa476f9f5060b952b85ee5534a7fb30cc46b5","slot":451801272},{"block":null,"method":"getAccountInfo","params":["B4UdLnvzCrnfRndLdgGTYZjcKTDsaFKB54cmKb2GoSne",{"commitment":"confirmed","encoding":"base64"}],"raw_result":{"context":{"apiVersion":"4.3.0","slot":451801273},"value":{"data":["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","base64"],"executable":false,"lamports":11644196,"owner":"CAMMCzo5YL8w4VFF8KVHrK22GGUsp5VTaW7grrKgrWqK","rentEpoch":18446744073709551615,"space":1544}},"result_hash":"8a95475cb8c570d2377d5795dc038e5ad05ce73059df841fc7e43f5bc5fa9191","slot":null},{"block":null,"method":"getTokenAccountBalance","params":["Gg5qCmVHd8S4oEoBHVAG8zK2ePsAmhkLhYVQqLT9vvpS",{"commitment":"confirmed"}],"result_hash":"47a39dcb166fa78b877e76e295faf4be2394f266e70ad532febfce3b6d76fd34","slot":null},{"block":null,"method":"getTokenAccountBalance","params":["AVNjMHaSNiA7v7FdhDCQwbCynVMSfw6q82p2Ls9beWRZ",{"commitment":"confirmed"}],"result_hash":"aa857dd0215966d63eaa26d07440eaad558364a3e004dd5fb4cd4cbc3fd4fe85","slot":null},{"block":null,"method":"getMultipleAccounts","params":[["Xs6B6zawENwAbWVi7w92rjazLuAr5Az59qgWKcNb45x","EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"],{"commitment":"confirmed","encoding":"base64"}],"result_hash":"7d1d49c4cbab4118ec5a1b98c6ed135f5b8f6a71d95a4e35470f81551268fd69","slot":null},{"block":null,"method":"getTokenSupply","params":["EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",{"commitment":"confirmed"}],"result_hash":"f96864eccf264ce24396a2a667648ce9dafa17d9230f8b560fdaaa52eada50f1","slot":null},{"block":null,"method":"getAccountInfo","params":["EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",{"commitment":"confirmed","encoding":"base64"}],"raw_result":{"context":{"apiVersion":"4.3.0","slot":451801278},"value":{"data":["AQAAAJj+huiNm+Lqi8HMpIeLKYjCQPUrhCS/tA7Rot3LXhmby4aMU3b0GwAGAQEAAABicKqKWcWUBbRShshncubNEm6bil06OFNtN/e0FOi2Zw==","base64"],"executable":false,"lamports":534808027998,"owner":"TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA","rentEpoch":18446744073709551615,"space":82}},"result_hash":"70a4214f4b5ad72e8461b7523b3dc39ada8817cf95df3f1c95f1f0c66c021033","slot":null},{"block":null,"method":"getTokenSupply","params":["Xs6B6zawENwAbWVi7w92rjazLuAr5Az59qgWKcNb45x",{"commitment":"confirmed"}],"result_hash":"daa964ec1b6d1f7306e369594bc0870dd6ee54b043ed8b374a1158b799fdfd15","slot":null},{"block":null,"method":"getAccountInfo","params":["Xs6B6zawENwAbWVi7w92rjazLuAr5Az59qgWKcNb45x",{"commitment":"confirmed","encoding":"base64"}],"raw_result":{"context":{"apiVersion":"4.3.0","slot":451801297},"value":{"data":["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","base64"],"executable":false,"lamports":5714160,"owner":"TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb","rentEpoch":18446744073709551615,"space":693}},"result_hash":"9f8bd0efed5a5919023a7a2d7e901e6493c190484e83c2222d0b2e816882f299","slot":null}],"registry_entry":{"chain":"Solana","contract":"Xs6B6zawENwAbWVi7w92rjazLuAr5Az59qgWKcNb45x","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-09-29T23:37:23Z","name":"Berkshire Hathaway","source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"BRK.B"},"registry_hash":"b3f72fc9046ef9a37e433405d5916bce13581b85d8cce5889f24cf56e53b77b4","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":451801272,"subject":"B4UdLnvzCrnfRndLdgGTYZjcKTDsaFKB54cmKb2GoSne","ticker":"BRK.B","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"BRK.B"}},"version":1}

Signature

ouOYedMsAIgIlsng112YXq2ScyQl8RwQu1QX/jcxQoWVDNDul0aXUWL7t9iHDdK85Wpu7rrqo0eHrgEoun90BA==

API call

GET /api/attest/6903be614416a2bde0cf2b274589bdbc39b54abe29d036426c307a6034b20da2

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.