[Technical] Security of the Terra network

Can everyone can explain how the terra network is secured? I cannot find any resource the explain its security well.

I have several questions around the network:

  • Is there an equivalent version of etherscan for Terra where I can see all transactions?
  • How many validators in the network at the moments? What are those validators? Are they Terra’s trusted partners? What is the criteria to become a validator?
  • What is the reward mechanism in Terra and how Terra defends against the 51% attack?

The majority of the information you are looking for are directly linked on the Terra home page here. You should also familiarize yourself with: Finder as well as the docs that explain requirements to be a validator