update Ethereum consensus mechanism (typo) in ch03-01-01 (#318)

src/ch03-01-01-transactions-lifecycle.md

@@ -101,7 +101,7 @@ It is considered to be an average of 6 blocks to reach the finality status; give
 Starknet, a Layer-2 (L2) solution on Ethereum, has a two-step transaction finality process. The first step is when the transaction gets accepted on Layer-2 (Starknet), and the second step is when the transaction gets accepted on Layer-1 (Ethereum).
 
 Accepted on L2: When a transaction is processed by the Sequencer and included in a block on Starknet, it reaches L2 finality. However, this finality relies on the L2 consensus and comes with a slight risk of collusion among Sequencers leading to transaction reversal.
-Accepted on L1: The absolute finality comes when the block containing the transaction gets a proof generated, the proof is validated by the Verifier contract on Ethereum, and the state is updated on Ethereum. At this point, the transaction is as secure as the Ethereum's PoW consensus can provide, meaning it becomes computationally infeasible to alter or reverse.
+Accepted on L1: The absolute finality comes when the block containing the transaction gets a proof generated, the proof is validated by the Verifier contract on Ethereum, and the state is updated on Ethereum. At this point, the transaction is as secure as the Ethereum's PoS consensus can provide, meaning it becomes computationally infeasible to alter or reverse.
 
 ### Comparison