Financial summary — cash in and out, acquisitions, disposals and gains, split by income year. One page.

Transaction ledger — every transaction across every venue in date order, with the source reference, a confidence flag and a note on anything derived.

Disposals and gains — each acquisition tracked as its own lot, each disposal traced to the lots it consumed, under a stated cost base method.

Reconciliation — proof the ledger agrees with each exchange's own records.

Items for attention — anything reconstructed, and every decision left to you, each with the rows affected and the amount at stake.

Method notes — the conventions applied and why. Five lines, not five pages.

Evidence index — every source file, its row count and a fingerprint proving it hasn't been altered.

Source data — the original exports, included in full so nothing has to be chased.

The reconciliation page compares my figure against the exchange's own figure for every asset at every venue, and gives you the formula to reproduce each one from the source tab. Paste it in, read the answer.

Every asset is traced from acquisition to disposal and has to close to nil or be accounted for as still held. Every transfer between a client's own accounts is matched to the receipt at the other end, recorded by a different company.