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chore(subsecond): add third-party live verification of ~1s finalization lag #2267

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chore(subsecond): add third-party live verification of ~1s finalization lag #2267

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5 changes: 5 additions & 0 deletions content/subsecond.mdx
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Expand Up @@ -23,6 +23,11 @@ As of April 9th 2026, mainnet runs with a block interval of about 400 ms instead
- Together with the consensus update, the [Streaming API v2](#ton-center-streaming-api-v2) delivers status updates with 30 to 100ms latency.
- Testnet remains the primary environment for project testing.

<Callout type="tip">
**Third-party verification.** [OpenChainBench](https://openchainbench.com/benchmarks/l1-finality) is an open-source, live benchmark that independently measures TON masterchain finalization (listed under the **Gram** ticker following the [rename vote](https://ton.vote/EQDQvywF226NXojPky_9gwbCz0FPoygqY11bGl03SONNBs5V/proposal/EQAv-VS2OM80SYLB0ouRWRcpFg4J0L-egUf1-utF-OJ6h0rK), via `tonapi.io`) at **~0.4 s (p50, 24h)**, which confirms the ~1 s finalization lag target above. The benchmark ranks 11 L1 chains under an open methodology; TON currently leads finality time in the comparison. Source: [github.com/ChainBench/OpenChainBench](https://github.com/ChainBench/OpenChainBench) (MIT), data CC-BY-4.0.
</Callout>


## Example of sub-second user experience in action

<video
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