Solidity : Blockhash function misuse

Overview

blockhash function returns a non-zero value only for 256 last blocks. Besides, it always returns 0 for the current block, i.e. blockhash(block.number) always equals to 0.

References

Solidity: Block and Transaction Properties

MEDIUM

Solidity : Blockhash function misuse

Overview

References

DerScanner Severity Score

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See also

Solidity : Return value of transfer, transferFrom, or approve function of ERC-20 standard is always false.

Solidity : Using approve function of the ERC-20 token standard

Solidity : ERC-20 transfer should throw