Cryptocurrencies like Bitcoin can be “forked.” In simple terms, this either creates two versions of a coin or updates one version.

Sometimes new coins are created this way.

In other cases coins can be “airdropped” to people who hold existing coins for a myriad of reasons.

This section includes information on cryptocurrency forks and airdrops.

Luna Fork

Luna forked creating a new asset called Luna 2. Meanwhile existing Luna is called Luna Classic.

Transaction Replay and Replay Protection With Hard Forks Explained

When a coin does a hard fork, two identical blockchains exist until changes to one of the chains is made. To avoid transaction replays (transactions made on one chain being broadcast on the other), at least one chain must implement replay protection (developers of one chain must change the format of transactions to make them unique).

Upcoming Ethereum Forks

There are a few Ethereum forks coming in 2019. These include the long planned Constantinople upgrade, ETH Classic Vision (ETCV), and Ethereum Nowa coming Jan 2019.