Solana ecosystem development team Anza delayed the mainnet-beta rollout of transaction V1 to the start of epoch 1035, scheduled for Sept. 15 at 1:20 a.m. UTC, after development teams requested more time for testing and integration. V1 increases the maximum transaction size to 4,096 bytes from 1,232 bytes, enabling more data to be processed in a single transaction for applications such as zero-knowledge proofs and large multisignature setups. V1 is already live on devnet. The update also changes how compute budgets are configured: existing compute budget instructions remain effective in legacy and V0 transactions but no longer apply to V1. Existing V0 and legacy transactions will continue to be supported.