Crypto

Solana's V1 Transaction Format Goes Live on Testnet, Tripling Max Size

Guavy AI Editorial Team Published September 3, 2026

Instruments

SOL

Solana's transaction format has been upgraded to V1 on its testnet, tripling the maximum serialized transaction size from 1,232 bytes to 4,096 bytes. This upgrade removes a bottleneck that has forced developers to use workarounds for years.

The new format is designed to natively support zero-knowledge proofs, large multisig transactions, confidential transfers, and BLS signatures within a single transaction. With the increased size limit, these complex operations can be packaged into single atomic transactions, unlocking new use cases on the network.

The V1 format has been tested on Solana CLI v4.2+ and Surfpool v1.5+, with mainnet activation confirmed for September 9, 2026. This gives developers two weeks of testnet runway to catch bugs before the real thing.

Solana's V1 Transaction Format Goes Live on Testnet, Tripling Max Size

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