When a digital currency is used fraudulently more than once before the transaction has been verified on a blockchain, it is referred to as double spending. In decentralized digital currencies like Bitcoin, where transactions must be verified by the network in order to avoid duplication, it is a serious issue.
Double spending is prevented by the consensus processes used in blockchain technology, such as Proof of Work (PoW), by validating transactions and ensuring their uniqueness before adding them to the distributed ledger.
A decentralized network's distributed ledger is a database that is updated and synchronized across numerous nodes or computers. Without the requirement for a centralized authority, it enables participants to securely and transparently record, preserve, and amend transactions or data. Blockchain systems are based on distributed ledger technology, which offers an unchangeable and impenetrable record of all network activity.
A system or network that lacks a centralized authority and distributes decision-making and control across numerous users or nodes is referred to as decentralized. A decentralized system is more resistant to censorship, single points of failure, and manipulation because no one organization has exclusive control over it.