Because new coins are only produced with the issuance of a new block, and each new block requires the solving of the proof‐of‐work problems, there is a real cost to the production of new bitcoins. As the price of bitcoins rises in the market, more nodes enter to compete for the solution of the PoW to obtain the block reward, which raises the difficulty of the PoW problems, making it more costly to obtain the reward. The cost of producing a bitcoin will thus generally rise along with the market price.
