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Sub-second finality: how to adapt your project
TON is rolling out Catchain 2.0, a consensus upgrade targeting sub-second block finality on mainnet in early April 2026.
What's changing:
– Block interval: ~2.5s → 200–400ms
– Finalization lag: ~10s → ~1s
– Throughput: up to ~5 blocks/sec
But a faster chain alone won't help users if apps still rely on old API.
We've published a step-by-step adoption guide covering:
🔹 Wallets & dApps: switch to TON Center Streaming API v2. Handle all four statuses: pending → confirmed → finalized → trace_invalidated.
🔹 Self-hosted nodes & liteservers: update to the latest release with Catchain 2.0 support before mainnet activation.
🔹 Indexers: prepare for up to 10x more blocks/sec. Connect to testnet and verify no lag accumulates over 30+ minutes.
Testnet already runs at sub-second speed. Test there now.
MyTonWallet and tonscan.org already use Streaming API and have nearly halved their reaction time, even before the mainnet upgrade.
📖 Full guide: How to adopt sub-second finality
Start adapting today. If your app isn't ready, users won't notice any improvement.