Solana triples transaction size in major network upgrade

Solana has launched its Transaction V1 format upgrade, more than tripling its maximum transaction data capacity from 1,232 bytes to 4,096 bytes. This change addresses a major structural bottleneck, narrowing the gap with Ethereum's flexible limit. The upgrade enables complex, single-operation atomic transactions, supporting zero-knowledge proofs, based rollups, and multisig wallets. However, developers and data services must update their systems to read the new format to prevent query failures.

Transaction V1 format upgrade

• ▪The previous 1,232-byte transaction limit on Solana was a restriction to fit within the IPv6 minimum MTU, which was bypassed by adopting the QUIC protocol under proposal SIMD-0296
• ▪The Transaction V1 upgrade does not increase the size of all transactions automatically, as legacy and v0 transaction formats remain supported and continue to operate under their existing rules
• ▪Solana launched its new Transaction V1 format on September 15, 2026, at approximately 01:00 UTC, which more than triples the maximum transaction data capacity from 1,232 bytes to 4,096 bytes
• ▪Solana's Transaction V1 format upgrade increases the data capacity of individual transactions rather than the number of transactions the network can process per second

Solana vs Ethereum capacity comparison

• ▪Solana's previous 1,232-byte limit acted as a structural bottleneck compared to Ethereum, which has no rigid protocol-level transaction size limit and instead uses a flexible block gas limit
• ▪While Solana's Transaction V1 format narrows the capacity gap with Ethereum, Ethereum maintains a structural edge by allowing users to run larger operations by paying higher transaction fees

Use cases for larger transactions

• ▪The 4,096-byte capacity allows developers to bundle more steps into a single atomic transaction, ensuring that either the entire sequence of steps succeeds or the transaction rolls back
• ▪Solana co-founder Anatoly Yakovenko stated that the upgrade enables operations requiring one transaction to move data atomically through two zero-knowledge roots, potentially allowing based rollups on Solana
• ▪The Solana Foundation identified several workloads that benefit from the expanded transaction space, including multisignature company wallets, zero-knowledge proofs, BLS signatures, Winternitz one-time signatures, and Confidential Transfers

Developer compatibility requirements

• ▪Blockchain applications, wallets, trading apps, and analytics platforms must be updated to recognize and read the new V1 transaction format to prevent data requests from failing
• ▪The Solana Foundation warned that a request for an entire block can fail if the block contains even one V1 transaction and the requesting service has not been updated to support the format