---
title: Sergio Aguado
url: "https://www.unknowngravity.com/en/autores-post-del-blog/sergio-aguado"
site: Unknown Gravity
published: "2026-07-27T14:09:14+00:00"
modified: "2026-07-27T14:09:14+00:00"
language: en-US
section: "Home > Autores post del blog > Sergio Aguado"
---

# Sergio Aguado

BLOG · ABOUT THE AUTHOR

Tech Leader at Unknown Gravity. He specializes in blockchain development and smart contract architecture for security tokens, including the permissioned ERC-3643 (T-REX) standard.

3 ARTICLES · PAGE 1 OF 1

## Articles by Sergio Aguado.

![](/wp-content/themes/unknowngravity/assets/cms/6a399c34237c619e0ed15416_6a399bdf83201e419d391811_erc-3643-estandar-security-tokens--en.jpeg)

22 Jun 2026 · Security, regulation and legal

### [ERC-3643: the technical standard for security tokens](/en/articulos/erc-3643-estandar-security-tokens)

What ERC-3643 (T-REX) is, how it enforces on-chain compliance with ONCHAINID and why it matters for regulated security tokens.

![](/wp-content/themes/unknowngravity/assets/cms/6a2faa5f126467f6b88788cb_6a2fa7fb88a8b8aa23e09911_security-token-vs-utility-token--en.jpeg)

1 Jun 2026 · Cryptocurrencies and tokens

### [Security Token vs Utility Token: Differences and Examples](/en/articulos/security-token-vs-utility-token)

Differences between security tokens and utility tokens: rights, applicable regime (MiFID II/LMVSI vs MiCA), supervision and examples.

![](/wp-content/themes/unknowngravity/assets/cms/6a2faa60126467f6b88788ec_6a2fa7fd65aee166196415d2_validez-legal-smart-contracts-espana--en.jpeg)

31 May 2026 · Security, regulation and legal

### [Are smart contracts legally valid in Spain?](/en/articulos/validez-legal-smart-contracts-espana)

A smart contract executes; it does not replace the contract. Civil Code requirements, evidentiary value and what prevails on conflict.