Double spending refers to an activity to use the same Bitcoin more than once, thus spending Bitcoin which he/she doesn’t have.

Bitcoin uses the proof-of-work system to distinguish legitimate transactions from attempts to re-spend coins that have already been spent elsewhere (doublespending).

Blockchain technology ensures the validity of a transaction is recorded on a distributed system of registers, all of which are connected through a secure validation system.

Due to the above reasons, doublespending of Bitcoin is impossible.