HicssGas Optimization Tips
Minimize on-chain dataUse librariesUse ERC1167Turn on the Solidity optimizerUse eventsUse literal instead of computed valuesAvoid to copy arrays in memoryAvoid for-loop over dynamic rangesOptimize order of variable declarationUse eth-gas-reporter
HicssEIP-712: Quick Intro and Use case
https://eips.ethereum.org/EIPS/eip-712 Abstract This is a standard for hashing and signing of typed structured data as opposed to just bytestrings. It includes a theoretical framework for correctness of encoding functions, specification of structured data similar to and compatible with Solidity structs, safe hashing algorithm for instances of those structures, safe inclusion of those instances in the set of signable messages, an extensible mechanism for domain separation, new RPC call eth_sig...
HicssHow Tornado Cash works
Tornado Cash is a coin mixer that you can use to anonymize your Ethereum transactions. Because of the logic of the blockchain, every transaction is public. If you have some ETH on your account, you cannot transfer it anonymously, because anybody can follow your transaction history on the blockchain. Coin mixers, like Tornado Cash, can solve this privacy problem by breaking the on-chain link between the source and the destination address by using ZKP.Deposit:Users deposit the same amount of ET...
Blockchain Developer
HicssGas Optimization Tips
Minimize on-chain dataUse librariesUse ERC1167Turn on the Solidity optimizerUse eventsUse literal instead of computed valuesAvoid to copy arrays in memoryAvoid for-loop over dynamic rangesOptimize order of variable declarationUse eth-gas-reporter
HicssEIP-712: Quick Intro and Use case
https://eips.ethereum.org/EIPS/eip-712 Abstract This is a standard for hashing and signing of typed structured data as opposed to just bytestrings. It includes a theoretical framework for correctness of encoding functions, specification of structured data similar to and compatible with Solidity structs, safe hashing algorithm for instances of those structures, safe inclusion of those instances in the set of signable messages, an extensible mechanism for domain separation, new RPC call eth_sig...
HicssHow Tornado Cash works
Tornado Cash is a coin mixer that you can use to anonymize your Ethereum transactions. Because of the logic of the blockchain, every transaction is public. If you have some ETH on your account, you cannot transfer it anonymously, because anybody can follow your transaction history on the blockchain. Coin mixers, like Tornado Cash, can solve this privacy problem by breaking the on-chain link between the source and the destination address by using ZKP.Deposit:Users deposit the same amount of ET...
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For the previous version of 0.6, solidity won’t check the overflow. For a uint8 variable with a maximum value of 255, when adding 1 to it, it will be 0.
Example for an attacker to exploit the contract.
When the attacker call transfer without any balance, the value will be overflow and will be a very large amount. So the attacker will get a very large amount of tokens.
For the previous version of 0.6, solidity won’t check the overflow. For a uint8 variable with a maximum value of 255, when adding 1 to it, it will be 0.
Example for an attacker to exploit the contract.
When the attacker call transfer without any balance, the value will be overflow and will be a very large amount. So the attacker will get a very large amount of tokens.
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