What does Transaction V1 change?

4,096-byte transactions in a new wire format: resource limits move into the message, lookup tables are gone, and un-upgraded readers start failing the moment it activates.

SIMD-0385: Transaction V1 — Solana Activation Status

Transaction V1 is not queued on-chain yet. Official status: Pending testnet activation on Anza's official schedule. It is already active on testnet.

Pending testnet activation on Anza's official schedule ↗

Network readiness95.0% of stake · threshold 95%

Mainnet activations begin two full epochs after 95% of stake adopts the release.

mainnet: not scheduled
testnet: active since epoch 1025 · 4 days ago
devnet: active since epoch 1140 · 3 days ago

Telegram alertsKnow the moment an upgrade is queued — join @xrootdev_updates or message the bot /start for a DM.

The full guideWhat breaks, what to check, and how to prepare →

How we know

Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.