The Luxury Playbook for Online Businesses

Introducing a different kind of playbook for a different kind of startup

Apr 1 • Alvaro Duran

March 2026

Why Ledgers Are More Than Data Warehouses of Money

And why integrity, not double-entry, is the foundation of financial software

Mar 25 • Alvaro Duran

1

You Don't Know What a Ledger Is For

You think you do, but you don't

Mar 18 • Alvaro Duran

3

How to Explain Accounting To Payments Engineers

The limitations of the use of UML-like diagrams to model financial transactions

Mar 11 • Alvaro Duran

4

Why Ledgers Must be Immutable

Ledgers are a “get your shit together” tool.

Mar 4 • Alvaro Duran

3

February 2026

Accounting For Multi-Currency Ledgers

How to break the rules of money and get away with it

Feb 25 • Alvaro Duran

3

Modern Treasury's Stablecoin Sandwich

After acquiring Beam, Modern Treasury wants to become the developer-first API for moving money in any form.

Feb 19 • Alvaro Duran

2

Stablecoins for Skeptics

The last crazy idea from cryptoland may be crazy enough to work

Feb 11 • Alvaro Duran

Ledgers of Catan

The future of accounting is commodity accounting.

Feb 4 • Alvaro Duran

2

January 2026

Why Low Cardinality Accounts Are A Ledger's Bottleneck

You can build a ledger that’s blazingly fast with a slow programming language.

Jan 28 • Alvaro Duran

2

TigerBeetle's Stablecoin Mistake

Is there such a thing as "the ultimate fintech database"?

Jan 21 • Alvaro Duran

1

Why Don't You Use Generics in Ledgers?

It's not you; it's that DRY and KISS are misguided.

Jan 14 • Alvaro Duran

3