Solana is scheduled to activate Transaction V1 on September 9, lifting the maximum transaction size from 1,232 bytes to 4,096 bytes, or about 3.3 times the current limit. Developers must migrate to the V1 format to use the additional capacity, while legacy and v0 transactions will continue under existing rules. The upgrade follows SIMD-0296 and Solana's adoption of QUIC networking, which removed the technical constraint behind the original size ceiling. The larger format can accommodate more instructions, signatures and account data in a single atomic transaction, supporting zero-knowledge proof workflows, large multisignature arrangements, BLS signatures, Winternitz one-time signatures and Confidential Transfers. Anatoly Yakovenko, Solana's co-founder, said the change could enable a transaction to move data atomically across two zero-knowledge roots and make based rollups viable on Solana. Transaction V1 went live on testnet in August, one month before the planned mainnet deployment. Five large Hyperliquid addresses opened combined SOL long positions worth $9.11 million between September 7 and September 8 as SOL fell 2% to about $102 and broader derivatives indicators weakened. Trading volume declined 10% to $6.58 billion, open interest fell 1.21% to $6.47 billion, and the long-to-short ratio stood at 0.94, while the reported funding rate was positive at 0.0025%. Solana exchange-traded funds recorded inflows for 10 consecutive weeks.