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 raises the maximum transaction size to 4,096 bytes from 1,232 bytes, enabling more data in a single transaction for applications such as zero-knowledge proofs and large multisignature setups. V1 is already live on devnet, while existing V0 and legacy transactions remain supported. Compute budget instructions continue to apply to legacy and V0 transactions but no longer take effect in V1 transactions.