What is 'Preimage of Block'?


#1

When we say about preimage of block, what does it exactly mean?

The data inside of block? (ex. each transaction, any input to change some state)

Thank you in advance.


#2

No idea. In general, a “preimage” is a value D such that hash(D) matches some given hash value. In a block this could likely refer to block data or the parent block.


#3

Thank you, so it would depend on context.