My beliefs are not immutable, they may change in the futura.
This creates an immutable, unforgeable record of all of the transactions across this network. This record is replicated on every computer that uses the network.
The boy was bored with home routines that were dull and unchanging.
A word is not a crystal, transparent and unchanging, it is the skin of a living thought and may vary greatly in colour and content according to the circumstances and time in which it is used.