I have read several responses to various questions SE. Some responses partially respond to the question so I was hoping to get your help to bridge my gaps in understanding.
Does every single node on the network validate the transactions in the mempool?
Once the block is created and the transactions are included within the block...
a) What does it mean to say that the block and its transactions are also validated by the nodes? Isn't the block validated simply because the miner already solved the block?
b) What is the validation process for the newly solved block? and the transactions within it?
I thought that consensus rules mean that every node follows the same rules for verifying transactions. Why does Euromoney.com state just a majority of nodes needs to agree that the transaction is valid? Is what they have stated incorrect?
Euromoney.com states "the decision to add a transaction to the chain is made by consensus. This means that the majority of “nodes” (or computers in the network) must agree that the transaction is valid. The people who own the computers in the network are incentivised to verify transactions through rewards."
Thank you in advance.