Are All Blockchains Susceptible to This Form of Transaction Reordering?

Most blockchains with transparent, public mempools and fee-based transaction prioritization are susceptible to transaction reordering. This includes major platforms like Ethereum and Bitcoin.

However, some blockchains are designed to mitigate this. Blockchains that use different consensus mechanisms, implement privacy-preserving features like encrypted mempools, or utilize fair ordering protocols (e.g. based on timestamps) can be more resistant.

The degree of susceptibility is a direct function of the blockchain's core architecture for transaction submission and block construction.