A gentle introduction to immutability of blockchains

Excellent intro of #Blockchain #Bitcoin
and more #Data 💡🔎 @tegenmunt 🔗

Bits on blocks

In the context of data security, the immutability of data stored on blockchains is important. What do people mean when they say “Blockchains are immutable”? In this post I try to explain the key concepts.

It may be useful to read introductions to blockchains and Bitcoin if you have just arrived here or are unfamiliar with them.


Immutable means that something is unchanging over time or unable to be changed.

So in our context, it means once data has been written to a blockchain no one, not even a system administrator, can change it. This provides benefits for audit. As a provider of data you can prove that your data hasn’t been altered, and as a recipient of data you can be sure that the data hasn’t been altered. These benefits are useful for databases of financial transactions.

Immutability is relative. For example if I send an email to a large list of…

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