If you respect your network, you try to break it before someone else does.
After a month of stability, we did what responsible builders do: we attacked our own testnet, systematically, with documentation, not drama.
We used the pre-funded test accounts included in genesis to flood the network with transactions. Not a handful. Hundreds per second. We watched the mempool swell until it hit its hard cap of 10,000. We observed how the fee-per-byte priority queue behaved under pressure, whether it remained deterministic, whether it degraded gracefully, and whether it could be manipulated. We watched signature verification parallelization earn its keep.
Then we killed nodes mid-production, on purpose. We wanted to observe three things: whether the network kept producing blocks, whether participation scores penalized in a fair and predictable way, and whether forks resolved deterministically when a producer disappeared at the wrong time.
We ran partitions deliberately. We split the bootstrap set into two isolated groups using firewall rules, let both sides produce independent chains for dozens of blocks, then healed the partition and watched convergence. This is where “it works in theory” becomes “it works when it hurts.” The fork resolver converged to the longest valid chain exactly as designed. More importantly, the multi-peer confirmation logic made it difficult for a single malicious peer to convince an isolated node to switch chains. That is not a nice-to-have. That is how you avoid certain classes of eclipse behavior.
We attempted eclipse-like scenarios against observer nodes with limited peer sets. We sent malformed transactions and oversized payloads. We tried replay attacks by resubmitting identical transactions and nonces. We tried timestamp edge cases. The validator rejected what it should reject, with explicit errors, not ambiguous failures.
And we found real bugs, because stress testing works:
- A race condition in mempool eviction under extreme load, where eviction and insertion could collide in a narrow timing window.
- A timestamp validation edge case near midnight UTC, where boundary handling could incorrectly flag valid blocks as suspicious.
- A peer reconnection loop triggered by rapid ban/unban cycles, which could waste resources and create instability under adversarial peer churn.
All three were fixed during the campaign. All were documented: what was attempted, what was expected, what actually happened, and what changed. That documentation matters as much as the fix. Without receipts, you are not building a protocol, you are building a belief system.
The emotional part of this week is simple: it is uncomfortable to watch your own network struggle. But that discomfort is the point. A blockchain is not a product that gets “used nicely.” It is infrastructure that gets used by adversaries, edge cases, and the random cruelty of the internet.
The testnet exists to make failure cheap. To expose weakness before there is real value. To teach us where reality disagrees with assumptions.
Breaking the testnet on purpose is not pessimism. It is respect.
