Solana v1 transactions to launch on testnet, boosting max size 3.3x

Solana is preparing to flip the switch on Transaction v1, a protocol upgrade heading to testnet in the coming weeks that triples the maximum transaction size. The change takes the ceiling from 1,232 bytes to 4,096 bytes, clearing the way for operations that previously had to be split across multiple transactions or stitched together with workarounds. What’s actually changing The upgrade is defined across two Solana Improvement Documents: SIMD-0296 and SIMD-0385. Together, they redesign how transactions are structured at the protocol level. Transaction v1 introduces a new version byte (0x81) and moves compute and priority-fee configurations into a fixed header mask. That’s a fancy way of saying resource limits get baked directly into the transaction header instead of being handled separately, which should streamline how validators process each transaction. The bigger payload capacity unlocks several use cases that were previously painful or impossible to execute atomically. Zero-knowledge proofs, large multisig transactions, and BLS signature schemes can now fit inside a single transaction rather than relying on lookup tables or bundling tricks to piece things together. Address Look...