Bitcoin's hashrate refers to the total computational power dedicated to mining and securing the network. Measured in exahashes per second (EH/s) or even zettahashes per second (ZH/s) for larger scales, it represents the speed at which miners solve complex mathematical puzzles to validate transactions and add new blocks to the blockchain. A higher hashrate means more miners are actively competing, making the network more resistant to attacks like the infamous 51% attack, where a single entity could theoretically control the majority of the mining power.
