How Do You Prove a Track Record to a Trading Partner?

What is a partner exposed to that an investor is not?

Your decisions in real time, and the consequences of them before anyone can exit. An investor reads a quarterly number; a partner lives inside the drawdown with you and discovers your risk behaviour at exactly the moment it matters.

So the evidence they need is not a return figure. It is a record of conduct.

What does a record of conduct look like?

Sizing consistency. Plot risk per trade over time. Flat is a system; spiky is a mood. The single most informative pattern is size increasing after losses, which is the behaviour that ends accounts, and it is visible in a record and invisible in a summary.

Behaviour after the worst week. Did trade frequency double? Did average risk rise? Did the strategy change? The trades immediately after a large loss are the most diagnostic trades in any record.

Rules versus reality. If the stated rule is 1% per trade, count how many trades exceeded it. A record where 15% of trades break the stated rule is describing a different system from the one being pitched.

Correlation with your partner's book. Two strategies at 0.9 correlation pooled together are one strategy at double size. If both partners trade, this is the number that decides whether combining reduces risk or concentrates it.

What should be agreed before anything is pooled?

• Who can take which risk, in writing, with a number attached.
• What happens at a defined drawdown — a level at which trading stops and a conversation happens, agreed while everyone is calm.
• How the record is kept, and by whom. If either partner can edit it, the first serious disagreement will be about what was actually done.
• How either side exits, and on what notice.

These are unromantic conversations that are far easier to have before the money is in.

Why does an independent record matter between partners?

Because partnerships fail on memory. Six months in, the argument is about what was agreed and what was actually traded, and a shared record that neither party can revise settles it in seconds rather than souring the relationship.

The specific thing a partner is trying to see is documented. Shefrin and Statman named the disposition effect in 1985 — the tendency to sell winners too early and ride losers too long^[1] — and it is invisible in a summary, because the summary is written after the fact by the person the effect has already acted on. It shows up only in per-trade timing.

Odean confirmed the same pattern across 10,000 brokerage accounts, where investors realised gains far more readily than losses,^[2] so a summary written afterwards is systematically flattering rather than occasionally so. And "here are my good months" is survivorship bias in one sentence: the bad ones never enter the count, an effect measured on fund performance in 1992.^[3]

On kappi the trade is committed from a Chrome extension before it resolves, sealed for a time-capsuled delay, then published on a Merkle-anchored log — so the record is complete by construction rather than by restraint, and it carries PnL, RME, correlation to SPX, mean R:R and trade count over 30, 100 and 200-day windows. $15/month to keep one; reading one is free.