Bitcoin Cash is the result of a bitcoin fork. It is extremely similar in many ways to bitcoin, but Bitcoin Cash has a few technical differences that make a big impact.
One difference, which has many significant follow-on effects, is the difference in block size. Bitcoin has a 1MB block size, while Bitcoin Cash has an 8MB block size. The larger block size is good news in that it helps process transactions a lot faster, but it also means a full node takes up a lot more data storage space.
The high fees and slow transaction times of the original bitcoin are a deliberate, but somewhat unfortunate, design choice. Bitcoin Cash was deliberately split away from bitcoin by a team who thought high fees and slow transactions would eventually destroy bitcoin. It was deliberately designed to essentially be bitcoin, except easy to send, receive and transact with.
No one can say for sure that Bitcoin cash will overtake Bitcoin, but you’ll find a lot of strong opinions in both directions. However, bitcoin’s transaction functionality seems to be the main issue. You will need to decide whether bitcoin’s transaction functionality will continue to affect Bitcoin Cash’s growth as well as consider what will happen if bitcoin ever solves these problems.
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