Solana Transaction V1 Increases Transaction Size to 4,096 Bytes

Anza launched Transaction V1 on the Solana testnet on September 1, with activation expected on September 9. This change increases the maximum size of each transaction from 1,232 bytes to 4,096 bytes, aiming to consolidate operations that were previously spread across multiple steps into a single atomic transaction. According to Solana Compass, this proposal allows for the processing of crypto and DeFi loads within a single transaction. The limit increase on the testnet took effect in epoch 1025. An update from the Solana Foundation noted that the new transaction size creates space for zero-knowledge proofs and larger multi-signature transactions, potentially reducing the number of transactions, signature overhead, and confirmation wait times. Two technical documents support this change: SIMD-0296 increases the transaction size, while SIMD-0385 defines the V1 message format. Transaction V1 is optional, and Legacy and V0 transactions will continue to operate. Infrastructure readiness is a core part of the final testing phase, providing adjustments for RPC providers, indexers, wallets, SDKs, and analytics platforms.

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