Jito activated preconfirmations for its Block Assembly Marketplace on Solana mainnet on September 9, routing early transaction signals to traders through Helius and Triton One. BAM-compatible validators represented 34.1% of staked SOL across 383 of 665 active validators at launch. Revenue is split 35% to participating validators by stake weight, 35% to the Jito DAO treasury and 30% to infrastructure providers, with the first distributions scheduled for October 2026. Early testing showed a 5-10 millisecond p50 latency advantage over shred-based signals. Preconfirmations are early commitments rather than guarantees, while a BAM Verifier checks finalized blocks and can disconnect validators that deviate from their commitments. BAM operates through AgaveBAM and FireBAM clients without hardware changes and uses Trusted Execution Environments to separate transaction sequencing from validator execution. The launch follows BAM’s growth from 12% of network stake in January 2026 and the Q2 2026 activation of its Maker Priority Plugin.