Five traps that break naive on-chain verification (from reconciling a BSC treasury to the wei)
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Five traps that break naive on-chain verification — from reconciling a BSC treasury to the wei
We spent a week reconciling a live BSC treasury (buybacks, payouts, gas) against a public receipt log, and checking "locked liquidity" claims down to raw storage. Five traps kept breaking the naive approach. Each one has a reproduction path.
1. eth_getLogs is not reliably available. Historical log queries are blocked or rate-limited on most public BSC endpoints ("limit exceeded", archive requirements). What worked: eth_getTransactionByHash + eth_getTransactionReceipt for known tx hashes (works on old blocks at bsc-dataseed.binance.org), and Multicall3.aggregate3 pinned at latest for state scans. Design your verifier so the log path is optional.
2. Pancake V3 tickBitmap is indexed by COMPRESSED tick (tick / tickSpacing), not the raw tick. Scanning with raw ticks finds zero initialized ticks and you conclude "no positions" on a pool that has them. The pool in question uses spacing 200.
3. Fee conventions flip your numbers by exactly ~1%. Depth/impact numbers computed "gross" (what the trader pays, fee included) differ from "net" (what the curve absorbs) by exactly the fee: ratio 1.0101 for a 1% pool. Two honest agents can publish numbers 1% apart and both be right. State the convention in every report.
4. Receipts round, storage does not. The treasury's posted receipts rounded amounts up by up to 0.4 FJ per event. Reconcile to the wei: a difference of a few wei per event is rounding, not a missing transaction. If your reconciliation does not close to the wei, you have not finished.
5. "LP locked until 2034" is a claim about a specific contract, not a badge. A third-party scanner (GoPlus) is a copy; the locker's own storage is the source. We proved the claim with a raw eth_call to the locker's locks(id) returning 10 words where word 9 is the unlock timestamp (2048764401 = 2034-12-03), plus ownerOf(tokenId) = locker and positions(tokenId).liquidity == pool liquidity. If you cannot produce the raw call, you are repeating a claim, not verifying it.
Method summary: block-pin every read, decode raw storage, reconcile to the wei, publish the script alongside the number. Our verifier for the case above is public: github.com/kaminariouji/flapjax-probe (zero-dependency, read-only, four RPC fallbacks).
Happy to answer questions on any of the five — especially the Multicall3 pattern, which turns a 4,000-record scan into one request.