On the 27th (local time), virtual asset analysis firm Delphi Digital announced through X (formerly Twitter) that Solana's large-scale network upgrade 'Alpenglow' is scheduled to be introduced in 2026. The upgrade includes a new consensus structure that replaces the existing Tower BFT and PoH (Proof of History), and aims to secure sub-second finality.
Two new protocols, called "Votor" and "Rotor," are at the core. Votor allows for final confirmation with only one or two rounds of voting after block creation, theoretically reducing block finalization delay from the current 12.8 seconds to approximately 100-150 milliseconds. This voting mechanism is finalized immediately if it receives 80% or more of the votes, and if it receives 60-80% of the votes, a second round of voting is required for final approval.
Another key feature, Rotor, improves upon the existing block propagation structure, Turbine, by establishing more efficient relay routes based on each node's network bandwidth and staking size. Simulation results show that block propagation times can be reduced to as little as 18 milliseconds.
This upgrade is expected to be rolled out sequentially between early and mid-2026 and is expected to be a groundbreaking step forward in the speed and efficiency of the Solana network.
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