pradyuman-verma
/ evm-puzzle.yul
Last active
April 13, 2023 10:27
evm-puzzle-007: RULES - 1. The puzzle has more than one solution | 2. All the values should be non zero | 3. You need to hack it such a way it satisfies every calldata passed.
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| GASPRICE | |
| CALLDATASIZE | |
| CALLVALUE | |
| PUSH2 0x3E8 | |
| PUSH0 | |
| CALLDATALOAD | |
| PUSH1 0xf4 | |
| SHR | |
| MUL | |
| PUSH0 |
pradyuman-verma
/ exchange.sol
Last active
April 13, 2023 17:55
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| // SPDX-License-Identifier: WTFPL | |
| pragma solidity ^0.8.0; | |
| // Simple order-based exchange for selling ERC20 tokens in exchange for ETH. Orders are stored off-chain and signed by the sellers. | |
| // Buyers submit the order to execute to the contract, along with the seller's signature and the ETH to purchase the tokens. | |
| // Orders can be EXACT or PARTIAL. Exact orders need to be fulfilled in a single operation, whereas partial orders can be fulfilled in multiple purchases from multiple buyers. | |
| // Orders can also optionally define a referrer address, who will receive 1% of the value in ETH of the purchase. Can be used to reward the app that stores the orders off-chain. | |
| // Does not allocate a fee if set to the zero address. | |
| // ========================== |
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