$1-$ Fill the comparison table for "the consensus mechanisms of different blockchain protocols" below: $($Mark with $x$ or leave blank$)$

$\backslash$table$[[$Mechanism$,\backslash$table$[[$Decentralized$],[$Control$]],\backslash$table$[[$Asymptotic$],[$Security$]],\backslash$table$[[$Low$],[$Latency$]],\backslash$table$[[$Flexible$],[$Trust$]]],[$Proof of Work,$,,,],[$Proof of Stake,$,,,],[$Byzantine Agreement,,,,$],[$Stellar Consensus Protocol,,,,$]]$

$2-$ What was the main purpose of the Merge? What do you think according to our discussions in class, the outcome is$?$

$3-$ How does Bitcoin prevents double spending problem?

$4-$ Despite the fact that Bitcoin announces all transactions publicly, how does it ensure privacy unlike traditional payment methods?