The solana docs recommend using the "confirmed" commitment level for processing series of dependent transactions, but details are scarce on the probability of rollback after a transaction reaches the confirmed state.

Are there any stats available about the likelihood of a transaction being rolled back after it reaches a confirmed commitment?

2 Answers 2


A "confirmed" block is one that has received votes from 2/3s of the stake on the cluster. A "finalized" block is one that has had 31+ more confirmed blocks built on top of it.

As Jon's answer mentions, there has never been an instance of a confirmed block getting rolled back. Whenever the validators are forced to do a network restart, they always restart from the last confirmed block.

To answer your question more directly, I believe the only situation in which a confirmed block could be rolled back is if the network operators all socially agree to restart the network from a block prior to the latest confirmed one.


As of this writing, a "confirmed" block has never been rolled back.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.