#Fogo #fogo $FOGO

Two transactions. Same account.

I thought I was clever.

3:12am. Slot 19288340. Fogo’s SVM runtime scheduler chewing through everything else. PoH ticking. Jaw tight before I even knew what I was looking at.

Different users. Different intent. I staggered them, and still funneled into one writable account because the code looked cleaner. Easier to read. I read it twice. Missed it both times.

Sealevel lined them up and it looked fine until it didn’t. First writer took the lock. Second didn’t fail—just waited. Quiet. Logs looked empty so I refreshed three times, four, like that changes the scheduler. Trace showed the same slot line again and my brain did the usual coping loop: blame RPC, blame the trace window, blame my own eyes. None of it stuck.

Forty milliseconds later on Fogo, the slot boundary closed. The second tx slipped into 19288341. Same payload, wrong slot.

And "wrong slot' is notcosmetic. It’s the difference between “I’m in the window” and “I’m explaining to myself why I’m now one cycle late.”

Zone C. Co-located. Not geography. CPU steady. Memory fine. Temps checked at 2am like a ritual. Eyes dry enough that blinking hurt.

It was my state layout. Three flows, one account. I knew better. Wrote it down once. Shipped it anyway.

Tower BFT stacked votes on the first while mine sat behind a lock I created. Fogo Firedancer validator layer-1 Lockout weight ticking up like it was the only thing moving.

I rewired on the fly. Split by action type. Narrowed the write set. First two attempts were ugly... split by user still overlapped. Don’t ask.

Next burst: both cleared inside one leader window.

I stared at the logs waiting for the pause. Expecting it.

Slot 19288346 closed.

If two hit the same shard inside the same Fogo ( @Fogo Official ) 40ms block cadence, serialization wins again. Quietly. Deterministically. No banner.

So I keep checking.

Not because it’s broken.

Because it’ll look fine right up until it doesn’t.