MAx/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":"2026-09-30T00:27:30Z","dev":false,"expires_at":"2026-10-01T00:27:30Z","issuer":"Backed xStocks","pool":{"base":{"address":"XsApJFV9MAktqnAc6jqzsHVujxkGm9xcSUffaBoYLKC","balance":"35933647","decimals":8,"symbol":"MAx"},"chain":"Solana","dex":"raydium-clmm","pool":"6y9sGdHQQEacKfAxVUTA8HRUCWmKYrbwZd3sFxxda23s","quote":{"address":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","balance":"231526216","decimals":6,"symbol":null}},"quote_share_of_supply":0.000012767576742339642,"reads":[{"block":null,"method":"getSlot","params":[{"commitment":"confirmed"}],"result_hash":"e77ca36564b29dbcb71aeda14f81e1846be28abfec72f674dd167d9e38ad1488","slot":451802639},{"block":null,"method":"getAccountInfo","params":["6y9sGdHQQEacKfAxVUTA8HRUCWmKYrbwZd3sFxxda23s",{"commitment":"confirmed","encoding":"base64"}],"raw_result":{"context":{"apiVersion":"4.3.0","slot":451802645},"value":{"data":["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","base64"],"executable":false,"lamports":11638123,"owner":"CAMMCzo5YL8w4VFF8KVHrK22GGUsp5VTaW7grrKgrWqK","rentEpoch":18446744073709551615,"space":1544}},"result_hash":"f146ca0a963f4a400cfeb61df54e72db4ca6ea38daf344e072bce8d710e2164e","slot":null},{"block":null,"method":"getTokenAccountBalance","params":["G4AYNc5bRpRdq2eKHtRK82w6trSVqgUjzXbgJPTLBFwp",{"commitment":"confirmed"}],"result_hash":"c44e44e5b51513060a0e552d918460e41fbbf80ae6ffdef0018738341daa07b4","slot":null},{"block":null,"method":"getTokenAccountBalance","params":["FwbDz1aVYwkrrVLU6w1QY6rvMKouES3327ouo4QtJLNv",{"commitment":"confirmed"}],"result_hash":"e931ef63b97e298ce780acaa368d91b1c58c10326aedf733515148da1895e3e4","slot":null},{"block":null,"method":"getMultipleAccounts","params":[["XsApJFV9MAktqnAc6jqzsHVujxkGm9xcSUffaBoYLKC","EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"],{"commitment":"confirmed","encoding":"base64"}],"result_hash":"b3ee92a9bb603332de8772a0f7a7e8ca9d02da85445061f1bc2bfa11ec127437","slot":null},{"block":null,"method":"getTokenSupply","params":["EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",{"commitment":"confirmed"}],"result_hash":"46c5e9afcacd3b2f6381beac085bf07df22afbfc7cebb197bd8cb26a361f2ac7","slot":null},{"block":null,"method":"getAccountInfo","params":["EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",{"commitment":"confirmed","encoding":"base64"}],"raw_result":{"context":{"apiVersion":"4.3.0","slot":451802668},"value":{"data":["AQAAAJj+huiNm+Lqi8HMpIeLKYjCQPUrhCS/tA7Rot3LXhmb6kzmr2H0GwAGAQEAAABicKqKWcWUBbRShshncubNEm6bil06OFNtN/e0FOi2Zw==","base64"],"executable":false,"lamports":534808027998,"owner":"TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA","rentEpoch":18446744073709551615,"space":82}},"result_hash":"84c5e29fac129888cd86de0af7d3bc66624c5c90d572005aab446e88ed6f84f4","slot":null},{"block":null,"method":"getTokenSupply","params":["XsApJFV9MAktqnAc6jqzsHVujxkGm9xcSUffaBoYLKC",{"commitment":"confirmed"}],"result_hash":"6b9b626cc6ad48c1c364fb86876f35729b21710ad4dac0cffc0688aa733dd744","slot":null},{"block":null,"method":"getAccountInfo","params":["XsApJFV9MAktqnAc6jqzsHVujxkGm9xcSUffaBoYLKC",{"commitment":"confirmed","encoding":"base64"}],"raw_result":{"context":{"apiVersion":"4.3.0","slot":451802688},"value":{"data":["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","base64"],"executable":false,"lamports":5616720,"owner":"TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb","rentEpoch":18446744073709551615,"space":679}},"result_hash":"d6cbd1307879d34dd2f7e4cb1058ffe5df48d82173191ae5625cd96fe9edce5c","slot":null}],"registry_entry":{"chain":"Solana","contract":"XsApJFV9MAktqnAc6jqzsHVujxkGm9xcSUffaBoYLKC","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-09-29T23:37:23Z","name":"Mastercard","source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"MA"},"registry_hash":"b3f72fc9046ef9a37e433405d5916bce13581b85d8cce5889f24cf56e53b77b4","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":451802639,"subject":"6y9sGdHQQEacKfAxVUTA8HRUCWmKYrbwZd3sFxxda23s","ticker":"MA","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"MA"}},"version":1}

Signature

GrDxk6uFU8zds4ixvpvOkgJn7tZDFJA9Rv4qs0AsGmywUHwujN4rX3eGBLbyOZZvOiuyaC/JZkS/ER41baTABw==

API call

GET /api/attest/5f96a8f6fc23c78bc86dff7d9977de84ed7eaed0bf50f850d24d5f1bae9bd125

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.