The word "immutable" means something that cannot be changed or altered. It describes something that is permanent and cannot be modified. Full definition
You will always pack whatever size backpack you have to the absolute exploding point... it must be some kind of immutable law of physics. (blog.tortugabackpacks.com)
This is because these parties «need a means to quickly correct errors on the blockchain,» which is not possible when using a blockchain - based system that creates immutable ledgers. (businessinsider.com)
Core characteristics such as immutable records, security, and efficiency means that it can be integrated into a wide variety of industries, such as supply chain management and (bitcoinist.com)