Glossary

Plain-language definitions of terms used across the HDL Group catalog — AI, Bitcoin, and wellness science.

Large Language Model (LLM)

An AI system trained on large amounts of text to generate and understand human language, such as the models behind ChatGPT or Claude.

Bitcoin

A decentralized digital currency and payment network that operates without a central bank, secured by cryptography and a fixed 21-million-coin supply.

UTXO

"Unspent Transaction Output" — the accounting model Bitcoin uses to track ownership of coins, distinct from the account-balance model used by banks.

Self-Custody

Holding your own Bitcoin or crypto private keys directly, rather than leaving assets with an exchange or third party.

Recommendation Engine

The algorithm a platform like YouTube uses to decide which content to show a given viewer, based on engagement signals.

Positive Psychology

The branch of psychology studying what makes life fulfilling, as opposed to focusing only on dysfunction — the research base behind The Art of Joy.

Sound Money

A monetary theory holding that a currency's value is best protected by a fixed or predictable supply, central to Bitcoin advocacy.

Digital Entrepreneurship

Building an income or business primarily through digital tools, platforms, and distribution rather than physical products or storefronts.