Last month I wrote that the first surprise of building this way was how work breaks when two systems are allowed to write to the same place. The rule that came out of it was one resource, one owner. This month is about what that rule is actually for, because it took me a while to see that the reason has nothing to do with tidiness.
A family's affairs do not live in one place, and they never have. There is a valuation in the private bank's statement, another in the custodian's portal, and a third in the spreadsheet someone in the family keeps. There is a beneficiary named one way in the trust deed and another way in a letter of wishes written nine years later. There is an instruction given on a call, minuted by one adviser and remembered differently by another. Nobody holding these versions is careless. They are each holding their own copy, kept for their own purpose, and the copies drift apart the way copies do.
The result is a quiet and specific cost. When a family asks a simple question, what is this worth, who is it going to, what did we agree, the honest answer is often that it depends which record you believe. Somebody then spends a day reconciling three versions into one, and by the next quarter the three have drifted again. I have watched capable people give a great deal of their attention to deciding which number is real before they can do anything with it at all.
Tidiness is not the point. What one resource, one owner produces is a single record of a family's affairs that is true and stays true, because there is exactly one place each fact is allowed to live and exactly one route by which it can change.
Here is where I got it wrong first, and this series is only worth writing if it includes those parts.
I thought a single source of truth was a thing you declare. You point at the authoritative record and say, that one. It is not a declaration. It is a discipline about every other copy. We had one authoritative record and, beside it, a perfectly reasonable working copy someone kept because it was quicker to glance at. For a few weeks the updates landed in the working copy, and the authoritative record was the one falling behind. Both looked right. Neither announced the gap. The fix was not a better spreadsheet. It was removing the second copy altogether, so there was nowhere for a well-meaning shortcut to become a rival version of the truth.
Once each fact has one home, something else falls out of it that I did not plan for. Every change to that record is written down as it happens, attributed to whoever made it, timestamped, and tied to the instruction behind it. Not a monthly summary written afterwards from memory. The actual event, at the moment it occurs. Everything done on a family's behalf leaves a trail, including the small things nobody would have thought to minute.
A back office this size, run by people alone, cannot produce that record. Not because the people are careless. Because writing down what you did is the first task to fall in a busy week, and it leaves when the person does. Here the writing down is not a separate job anyone has to remember. It is how the work is done at all.
What that gives a family is a plain answer to a question they are rarely able to ask cleanly: what is true, who decided it, when, and on whose instruction. When something has to be reconstructed years later, for a tax authority, for the next generation, for a disagreement nobody saw coming, the record is already there, and it does not depend on anyone remembering. In most small firms that history lives in somebody's head and their filing habits, which means the firm is one illness or one departure away from losing it. Here it lives in the system and it survives the week it was made in.
One rule sits underneath all of this and does not change. Nothing leaves the firm without a person approving it. No payment, no document, no email to a counterparty, no commitment of any kind. A single true record is a powerful thing, and precisely because it is powerful, a person stands between it and the outside world. The machine keeps the record honest. A human decides what is done with it.
If you are weighing this up for your own arrangements, the question worth putting to your advisers is not how much data they hold about you. It is how many places a single fact about you lives, and which one of them is the truth. If the honest answer is more than one, then somewhere you are already paying for the day it takes to find out.
This piece was drafted on the same operating layer it describes, and it did not go anywhere until I had read it, argued with it, and changed a good deal of it. The technology prepares, a human releases. Today that human is me, and this article is not an exception to the rule.
Christophe Schaillee, Founder and Managing Partner, NexSky