QED
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QED certificate

QED record 394f866d5487 from . View the live pool page.

Verified · Backed xStocks SPY

Does SPYx / USDC match its issuer's published contract?

The pool's quote contract matches Backed xStocks's registry entry for SPY.

Verified means the observed quote-token contract matches an issuer-published registry entry on Ethereum. Only the quote-side contract is checked.

This does not prove backing, custody, reserves, price, safety, solvency, or endorsement.

Signature valid · contract match

Ethereum Uniswap v3
Subject
SPYx / USDC · Ethereum
Pool address
0xAfdd3BdC20A31652e48b56B73952Ca324f544575
Issuer match
Backed xStocks · SPY · View SPY contracts
Checked
Valid until
Serial
394f866d5487
Signed by
QED (key id GJWKkiUd)

After this time the certificate remains a historical record, but it no longer establishes current pool or registry state. Re-check to create a fresh observation before relying on current facts.

Compare this address with the one you were given before you trade.

under 0.01% Checked

Only trust an address you pasted here or opened from this page.

How to verify this yourself

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":26233129,"chain":"ethereum","checked_at":"2026-10-20T10:14:49Z","dev":false,"expires_at":"2026-10-21T10:14:49Z","issuer":"Backed xStocks","pool":{"base":{"address":"0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","balance":"8289099316865689","decimals":18,"symbol":"SPYx"},"chain":"ethereum","dex":"uniswap-v3","pool":"0xAfdd3BdC20A31652e48b56B73952Ca324f544575","quote":{"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balance":"16603113","decimals":6,"symbol":"USDC"}},"quote_share_of_supply":2.749163188481955e-7,"reads":[{"block":26233129,"method":"eth_blockNumber","params":[],"result_hash":"4f4b32ce701ed6fdb9b31cf254a36573c5f3a891cef54ee8fb0c56f82d544749","slot":null},{"block":null,"method":"eth_call","params":["0xAfdd3BdC20A31652e48b56B73952Ca324f544575","token0()"],"raw_result":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","result_hash":"cea64c28d119727097c6477c099ad4a765988e1cd2c523476d2d061294a1ad23","slot":null},{"block":null,"method":"eth_call","params":["0xAfdd3BdC20A31652e48b56B73952Ca324f544575","token1()"],"raw_result":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","result_hash":"6239f262cd1d947b947081c9eba6e8771378942478e1d48654f4f132ebb96021","slot":null},{"block":null,"method":"eth_call","params":["0xAfdd3BdC20A31652e48b56B73952Ca324f544575","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xAfdd3BdC20A31652e48b56B73952Ca324f544575","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xAfdd3BdC20A31652e48b56B73952Ca324f544575","factory()"],"raw_result":"0x1f98431c8ad98523631ae4a59f267346ea31f984","result_hash":"24b698329e82b3994906dfbd01281d9a6f12f65aa59de65831657e6e928d4c80","slot":null},{"block":null,"method":"eth_call","params":["0xAfdd3BdC20A31652e48b56B73952Ca324f544575","fee()"],"raw_result":"3000","result_hash":"53232d7da9fd2a1931dcd44af08ec415dd52ab8ecc4037ef5e68eb3753978a2e","slot":null},{"block":null,"method":"eth_call","params":["0x1F98431c8aD98523631AE4a59f267346ea31F984","getPool","0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xbb8"],"raw_result":"0xafdd3bdc20a31652e48b56b73952ca324f544575","result_hash":"eb48eee9e57274ee1cb86d4f1cc533d63953b06ecb1dd2b21e5081e364e79a0b","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","symbol()"],"raw_result":"Some(\"SPYx\")","result_hash":"de41d2c14fa73c8e3ea34e4093b99a9165ac26bef56a7d98b711bdb990d48466","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","balanceOf","0xAfdd3BdC20A31652e48b56B73952Ca324f544575"],"raw_result":"Some(\"8289099316865689\")","result_hash":"0cd642c5ed1d97a571d324d5886965375947d74daa3ba23a633ef05837d82044","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","balanceOf","0xAfdd3BdC20A31652e48b56B73952Ca324f544575"],"raw_result":"Some(\"16603113\")","result_hash":"7e1c774b841fbafba8e66322e8d44ff2d39b81547d1710ce3a55e22ea40f6352","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","symbol()"],"raw_result":"Some(\"USDC\")","result_hash":"a3c9e246b0832b52e41efce041d8614251f5e288cdd4b192e85bfd3dfcb748ff","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","name()"],"raw_result":"Some(\"USD Coin\")","result_hash":"fe94af15dc887a2c9df1fb0d6d276e6c586ca9d430ffeac0d05e4baee0637fd1","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","decimals()"],"raw_result":"Some(6)","result_hash":"c68fe6989b1835302197d0af5be845dfab10ed9f9632205eb4ab5b949b9e1a6a","slot":null},{"block":null,"method":"eth_call","params":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","totalSupply()"],"raw_result":"Some(\"47782181011620890\")","result_hash":"ecb054371b5f853b57553cdde6eae4e31016f680ad0f8629f9b3aa904d459e9a","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","symbol()"],"raw_result":"Some(\"SPYx\")","result_hash":"de41d2c14fa73c8e3ea34e4093b99a9165ac26bef56a7d98b711bdb990d48466","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","name()"],"raw_result":"Some(\"SP500 xStock\")","result_hash":"79ea6335245c40c23594121bcd21ed9b06c5de3e2a3ad3ae9b0b706bd912711d","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","totalSupply()"],"raw_result":"Some(\"30151354243335401773820\")","result_hash":"356a3f04c2ff8eeb3fd17bc573caf03fb6ca67331d8b483ae4d2d8b8a45641e6","slot":null},{"block":null,"method":"eth_getCode","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null},{"block":null,"method":"eth_getCode","params":["0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","latest"],"result_hash":"71ee049d0c0cab5d785d7aef2e6b591e511475fb8ef465f4d8f5335bfd412bfd","slot":null}],"registry_entry":{"chain":"ethereum","contract":"0x90A2a4c76b5D8c0bc892A69EA28Aa775a8f2dD48","decimals":null,"issuer":"Backed xStocks","last_checked":"2026-10-20T09:40:19Z","name":"SP500","official_deployments":[{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"Ethereum","wrapper_address":"0xc88fcd8b874fdb3256e8b55b3decb8c24eab4c02","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"BinanceSmartChain","wrapper_address":"0xc88fcd8b874fdb3256e8b55b3decb8c24eab4c02","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"Arbitrum","wrapper_address":"0xc88fcd8b874fdb3256e8b55b3decb8c24eab4c02","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"XsoCS1TfEyfFhfvj8EtZ528L3CaKBDBRqRapnBbDF2W","network":"Solana"},{"address":"TKN6A3wSWHdZGanW5wBFkeFq2Yw3rhGqNz","network":"Tron"},{"address":"EQB1fyBAA9qQDP6LEGaF3cbU-Xbr-p6ESBZGnqlHkHIHAJZv","network":"Ton"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"Mantle","wrapper_address":"0xc88fcd8b874fdb3256e8b55b3decb8c24eab4c02","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"HyperEVM","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"Ink","wrapper_address":"0xc88fcd8b874fdb3256e8b55b3decb8c24eab4c02","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"XLayer","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"Optimism","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"},{"address":"0x90a2a4c76b5d8c0bc892a69ea28aa775a8f2dd48","network":"Monad","wrapper_address_v2":"0xe7e553cd128f0011777323a0b44a7b96ea1cb540"}],"source":"xstocks-api","source_url":"https://api.xstocks.fi/api/v2/public/assets","ticker":"SPY"},"registry_hash":"af3c37a81cb7944cc1629e1bdb3d7e524e4edd4e0a8725e736cdb69f4867e121","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xAfdd3BdC20A31652e48b56B73952Ca324f544575","ticker":"SPY","verdict":{"Verified":{"issuer":"Backed xStocks","ticker":"SPY"}},"version":1}
Signature
/UNnF/wo+wisQEp8XlcwrTj4qH50kXxGn/Oopk0uDavqUvHCfRtOZi2c4f52rwDxQlzEuLo8kTjBd2d4oYJGAw==
API call
GET /api/attest/394f866d5487e2b12cd4cd96ccf81f2d1004c54e67a84d0491c02cdba3ec0a67
  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.