Solana to Launch Transaction V1 on Sept. 9 With 4,096-Byte Transaction Limit
Solana to activate Transaction V1 on mainnet Sept. 9 Solana will raise the maximum transaction size from 1,232 bytes to 4,096 bytes on Sept. 9 with Transaction V1, allowing workloads that previously needed multiple transactions or Jito bundles to execute as one atomic call. The change is tied to SIMD-0296 and is designed to fit a single 4 KiB validator memory page; Anza says RPC providers need Agave v4.2, or v1 transactions may trigger error -32015 and bad fee data.