Does SPY / WETH 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":91675899,"chain":"robinhood","checked_at":"2026-10-18T09:48:42Z","dev":false,"expires_at":"2026-10-19T09:48:42Z","issuer":"Robinhood","pool":{"base":{"address":"0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","balance":"522706340817954741090","decimals":18,"symbol":"WETH"},"chain":"robinhood","dex":"uniswap-v3","pool":"0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","quote":{"address":"0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","balance":"921466126611501783074","decimals":18,"symbol":"SPY"}},"quote_share_of_supply":0.033894762036539836,"reads":[{"block":91675899,"method":"eth_blockNumber","params":[],"result_hash":"8814e6294da07504a74c14aa974f28675af1206598c1f6071a5ac16ba24b7879","slot":null},{"block":null,"method":"eth_call","params":["0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","token0()"],"raw_result":"0x0bd7d308f8e1639fab988df18a8011f41eacad73","result_hash":"de544c5c8fa36cc133d3195abda0458ac2fac1d8dc7a92dfa423a4c9aa1b415d","slot":null},{"block":null,"method":"eth_call","params":["0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","token1()"],"raw_result":"0x117cc2133c37b721f49de2a7a74833232b3b4c0c","result_hash":"0bad12daf170a4396e80fc7cf0113478ee41f5efde1eee3745b8587273255e6f","slot":null},{"block":null,"method":"eth_call","params":["0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","getReserves()"],"raw_result":"false","result_hash":"076de6e730df0b4c3860877a0f619c6ac11f8aefd78313ac793a2a703c026869","slot":null},{"block":null,"method":"eth_call","params":["0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","slot0()"],"raw_result":"true","result_hash":"18d10c7d2b4b04aaf04254d1ae5d655a5dc0407cbcdd5a8c3986e985370f36ee","slot":null},{"block":null,"method":"eth_call","params":["0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","factory()"],"raw_result":"0x1f7d7550b1b028f7571e69a784071f0205fd2efa","result_hash":"bf7614e6e838b22e4363dfcb3022451641875235ca13e64f8d2d8c3334ff85f3","slot":null},{"block":null,"method":"eth_call","params":["0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","fee()"],"raw_result":"500","result_hash":"5ac95f46dcda9e6a85f4d281cd691aea7b00846d8f8612d198d396136e9c5140","slot":null},{"block":null,"method":"eth_call","params":["0x1f7d7550B1b028f7571E69A784071F0205FD2EfA","getPool","0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","0x1f4"],"raw_result":"0xddcbba3666f578e3f09516f21ff85bfee859ab5e","result_hash":"bc995bd78c86db363a60d247dbaf9c78737554c89eced5192fe64b53c043532a","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","symbol()"],"raw_result":"Some(\"WETH\")","result_hash":"dc9a1e89eb43cbff5ed113508a53364a9573ef16fa5feb01fc948b3da8bfe14b","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","balanceOf","0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e"],"raw_result":"Some(\"522706340817954741090\")","result_hash":"79fe3f79199867db752303b38496b52eb187db9e6e8f89b84c192e5ce7126e92","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","symbol()"],"raw_result":"Some(\"SPY\")","result_hash":"34d3f5561d0147a414433e6c15434a3cfed40c9603e695e4557af839e9d67e41","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","balanceOf","0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e"],"raw_result":"Some(\"921466126611501783074\")","result_hash":"0c4488be3a7e0e42add8f7849cf82510058eb7b16cdb62ba86963a08af09c676","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","symbol()"],"raw_result":"Some(\"WETH\")","result_hash":"dc9a1e89eb43cbff5ed113508a53364a9573ef16fa5feb01fc948b3da8bfe14b","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","name()"],"raw_result":"Some(\"WETH\")","result_hash":"dc9a1e89eb43cbff5ed113508a53364a9573ef16fa5feb01fc948b3da8bfe14b","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73","totalSupply()"],"raw_result":"Some(\"38676721367608545748521\")","result_hash":"f686dd1350e62895ad1f7976e79ac03fc29ed9b94c04a3671c613ede95201677","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","symbol()"],"raw_result":"Some(\"SPY\")","result_hash":"34d3f5561d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S&P 500 ETF Trust • Robinhood Token\")","result_hash":"8e872eb8019f8165d7591012f3d4fabe99c7ad3ac88c5827668a1278380a33a5","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","decimals()"],"raw_result":"Some(18)","result_hash":"c14f173ff30df32f36fac2ea29d9a20482082428fd32b58be5433d310884f764","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","totalSupply()"],"raw_result":"Some(\"27186092223280000000000\")","result_hash":"e979f875c266e2f95d7f0216d26a1e6de93250ed8a34ebd26ebe35fdcfc983e5","slot":null},{"block":null,"method":"eth_call","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","uiMultiplier()"],"raw_result":"1001717991187472003","result_hash":"23f9fe5ef231fb76617034b1a2541e1a829a3a2b9ea57f99dded816d6ecf8bfe","slot":null},{"block":null,"method":"eth_getCode","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null},{"block":null,"method":"eth_getCode","params":["0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","latest"],"result_hash":"e023f4a2e14683cf62969bf3dc7d7821b1e293e30ebe17f3bc5fd0b223173f25","slot":null}],"registry_entry":{"chain":"robinhood","contract":"0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","decimals":18,"issuer":"Robinhood","last_checked":"2026-10-18T09:47:33Z","name":"SPDR S&P 500 ETF Trust","official_deployments":[{"address":"0x117cc2133c37B721F49dE2A7a74833232B3B4C0C","network":"Robinhood Chain"}],"source":"robinhood-registry","source_url":"https://api.robinhood.com/rhj/assets","ticker":"SPY"},"registry_hash":"3143486c8ed17e52c07540b096bdf4ef50abfca368b23311d9290e9923561570","signer":"GJWKkiUd3zj1pJGfeE7JitiPiwDJC6XmNFvpJWJuvvpn","slot":null,"subject":"0xDDCBBa3666f578E3F09516f21Ff85BFee859AB5e","ticker":"SPY","verdict":{"Verified":{"issuer":"Robinhood","ticker":"SPY"}},"version":1}

Signature

AxaSsNq1dWynxmEM43oWs6/p5avb1LmnBPKoNoTpB0SW+m/6A+lOo4uDHfDX3lnqwRquOJQdBFGU/BQEqOiHCQ==

API call

GET /api/attest/251dfded819958e839d05ae1a5b20da03472199daaf3fed3808123d6fdc28bcf

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.