Taiko, the zkRollup-based Ethereum Layer 2 network, announced the launch of Eldfell L3 (Alpha-4 testnet). The testnet is designed to test the deployment of Taiko on Taiko as the L3 initial layer (Rollup on Rollup), and to test the new pledge-based proof or economics. In Alpha-3, Taiko's design was the first prover to win. In a testnet scenario, this would lead to "wasted work" by many provers, as they all try to prove the same block, but only one gets rewarded. Whereas in Alpha-4, the protocol appoints provers from a pool and assigns them to proposed blocks. That designated prover must then submit valid proofs for block validation within a set time window. If the prover fails to submit the proof in time, its stake will be slashed. The higher the number of tokens staked, the more likely the prover will be selected.