What is a transaction block?

In that capacity, a transaction block would basically correspond to her page in a ledger where you have multiple transactions that are listed in that page of the ledger. And the goal-- the Bitcoin miner's goal-- is to really, essentially, to take that page and get it added to the global ledger book, the global comprehensive ledger book.

What is a bitcoin transaction block?

So if you recall our ledger analogy, a single Bitcoin transaction essentially corresponds to a proposed entry in a ledger. In that capacity, a transaction block would basically correspond to her page in a ledger where you have multiple transactions that are listed in that page of the ledger.

What happens if a transaction block is rolled-back?

All this is happening within the transaction block, so none of it is visible to other database sessions. When and if you commit the transaction block, the committed actions become visible as a unit to other sessions, while the rolled-back actions never become visible at all.