The cryptocurrency scalability problem refers to the capability of a cryptocurrency network to handle a growing amount of transactions. Bitcoin can process 1MB size of transactions every 10 minutes. With an average transaction size of 250 Bytes, this means the network can process 4000 transactions (1 000 000Bytes / 250Bytes = 400) every 10 minute, which translates to 3-7 transactions per second. This limit on the transaction amount causes a bottleneck in the network as more and more people use Bitcoin. Currently the issue is being solved by the Bitcoin community through innovations like Lightning Network and Schnorr signatures.