Solana activates Transaction V1 on mainnet, boosting transaction size 3.3x
Solana (SOL)
Editor:
Eugene Serbin
cryptobriefing.com reports that Solana has activated Transaction V1 on mainnet at epoch 1035, roughly 01:20 UTC on September 15, 2026. This upgrade expands the maximum transaction size from 1,232 bytes to 4,096 bytes, a 3.3x increase driven by SIMD-0296 and SIMD-0385. The original limit was tied to IPv6 Maximum Transmission Unit constraints and QUIC packet limits.
Implementation was led by Anza and coordinated by the Solana Foundation, with key contributions from Jacob Creech and Andrew Fitzgerald. The rollout followed a phased approach, with local testing in August, testnet activation on September 1 at epoch 1025, and mainnet launch two weeks later. The v1 format is opt-in, ensuring legacy and v0 transaction formats remain fully supported.
This change enables zero-knowledge proofs, complex multisig configurations, and confidential transfers to execute atomically in a single operation. Infrastructure providers like RPC nodes and indexers must update systems to handle new compute limits and priority fees. The upgrade reduces partial execution failures for DeFi protocols by allowing more logic within one atomic transaction.
How the market reacted
Whalio's own Binance spot order flow for SOL, measured when this story was written up on 15 September 2026. Not the outlet's figures.
Solana is trading at $102.53 with a 1-hour buy ratio of 56.4%, indicating immediate buying pressure that contrasts with the 4-hour ratio of 44.4%. The 1-hour volume delta is positive at +$889,386, suggesting recent inflows, while the 4-hour delta is negative at -$3,633,505. Over the last 24 hours, the buy ratio sits at 49.0% with a negative volume delta of -$4,679,041 and a CVD of -$2,346,042. The buy ratio measures the proportion of buy volume relative to total volume, while volume delta tracks the net difference between buy and sell volume. Buying pressure appears to be building in the short term but has been fading over the longer 4-hour and 24-hour windows.
The latest daily buy ratio of 48.8% sits at the 27th percentile of the last 322 days, against a median of 50.0% - weaker buying than most days.
Was that an ordinary day?
The same Binance spot measurements for SOL, averaged over the days leading up to the story.
Over the preceding week, the 7-day average buy ratio was 48.4%, making the current 24-hour ratio of 49.0% slightly above average by 0.6 points. Spot volume for the 24-hour period was $224,981,401, which is 1.10x the weekly average, indicating elevated activity. Net buying occurred on 2 of the last 7 days, with a total 8-day volume delta of -$47,928,356. The price has declined by 1.2% over the 8-day period. This represents an ordinary day for the coin, with activity levels close to the weekly norm despite the recent upgrade.