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Storage variables can be cached to save gas

Low/InfoOrange Bridge audit·Three Sigma·Cross-chain bridge·15th July, 20243S-OB-N03

Description

Reading/writing from the same storage variable more than once should be avoided to save gas.

Recommendation

BRC20Factory::burn() can cache the fee (read twice). Vault::deposit() cache the fee (read thrice).

Vault::acceptAdmin() can cache the pendingAdmin (read 4 times). Vault::withdraw() can cache signers.length (read number of signers times).

Status

Addressed in #68ce26f.

Source

Disclosed by 0xSimao · Sherlock's 2025 Watson of the Year · 21 first places in 57 audit contests