What kind of complexity are we talking about?
The difficulty of bitcoin miners' mathematical puzzle-solving to validate transactions and add new blocks to the network is measured.
Just a few days before the much awaited halving event, the difficulty of mining on the Bitcoin network increased by about 4% to an all-time high. This adjustment, which is valued at 86.4 trillion, is a significant turning point in the history of cryptocurrencies.
A miner's hash rate, which indicates the total amount of processing power they have provided to the network, increases as the difficulty of mining increases. As a result, it's going to get difficult day by day to mine BTC even more
