What one Solana slot did

Facts about ONE slot, addressed by number. produced: false is a real answer, not an error: that slot's leader published no block and the chain moved straight on, which happens to a few slots in a thousand, and every other field is then null. A slot the chain has not reached yet is NOT that answer — it returns 404, because the slot has no history to describe yet. transactions.total counts everything the block carried, consensus votes included, and votes are about half of a Solana block: read nonVote for the user traffic. nonVoteFailed counts transactions that were included and then failed — they paid their fee and are part of the block, and roughly two in five non-vote transactions land that way, so a failure count near half is normal and not a degraded answer. feesLamports is what every transaction in the slot paid; leaderFeeLamports is what the leader was credited, which is the larger part of it but not all of it — both are published raw and neither is derived from the other. blockTime is null on early slots, which carry no block time at all. commitment is how much stake has voted on the block and how much of it has rooted it; the chain keeps that tally only for its most recent few hundred slots (about two minutes), so it is null on any older slot, and within that window it moves from one request to the next as votes deepen.