SOL mainnet activated Transaction V1 at epoch 1035 (about September 15 01:20 UTC, which is 9:20 AM Beijing time). The per-transaction size limit was raised from 1,232 bytes to 4,096—about 3.3×. This isn’t the “faster” on the marketing page; it’s about packing things that previously had to be split across multiple transactions—like ZK proofs, large multisigs, BLS, and confidential transfers—into a single atomic transaction. The rationale is SIMD-0296 (larger transactions) and SIMD-0385 (v1 format). Anza led the implementation, and the Solana Foundation coordinated. The official page pins the activation point to epoch 1035; ChainCatcher cites Anza X: resource requests (CU limit, priority fees, account data loading, heap size) are moved into the transaction header as well, no longer relying on separate compute budget instructions. The sending side is opt-in: legacy / v0 is still supported, and existing applications won’t suddenly break overnight. What really needs to change is the RPC, indexing, and the browser—officially noted as breaking change for the infrastructure.$SOL
