If you’ve been crypto-curious you’ve probably heard people talking about SegWit. In case you still wonder what that is or why it is important, we’re here to shine a light on the topic.

Like any other invention, Bitcoin has never been completely perfect. Since the very beginning crypto enthusiasts have been looking for its flaws and suggested the improvements. One of the major problems used to be the transaction malleability.

What on Earth is that?

BTC transactions are being sent to blocks. Each block has a limited size of only 1 MB. Within every transaction, there is also “a code”. Inside this code (besides a bunch of other things) you have two major pieces of information. They are your public key and a signature, that can be also referred to as a Witness, and you need both of them to confirm a transaction. And that’s where the first problem lies — those signatures were not immune. Anyone could modify them and change the transaction identifier. The whole process would be compromised.

But that’s not it. Another issue is that blocks are too small for an increasing amount of data. If you cannot make them bigger, you have to find another way. Otherwise, the speed and cost of every transaction skyrockets. That’s called bitcoin scalability problem.

That’s not fun! What can we do?

Don’t panic, it’s all been sorted out already. SegWit, short for a segregated witness, was that alternative solution. It stores the signature information outside the base block and as a result transactions weigh less. Blocks become lighter and transactions safer, cheaper and faster. Everyone’s happy.

On top of all that, SegWit is a “soft fork’ that simplifies its implementation.

Is there a “But”?

Yes and no. SegWit has been criticized by some users for offering a temporary solution for a long-term problem. Miners and other Bitcoin services like exchanges and wallets were not very happy with transaction fees going down either. It even caused some hard forks — one of which is Bitcoin Cash.

But for a regular user, SegWit is good news. Not only it saves your time and money but also brings more security in all BTC (and Litecoin, Digibite etc.) transactions you make.

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