--- title: ERC-3643 url: "https://www.unknowngravity.com/en/glosario/erc-3643" site: Unknown Gravity published: "2025-06-11T06:35:51+00:00" modified: "2026-07-30T15:43:02+00:00" language: en-US description: "ERC-3643, formerly known as T-REX, is a token standard on Ethereum and compatible EVM networks designed specifically for the issuance and management of regulated tokenized assets, like stocks, bonds…" section: "Home > ERC-3643" --- # ERC-3643 GLOSSARY · BLOCKCHAIN & WEB3 Standard for regulated tokens and permissions that meet legal requirements such as KYC and AML. WHAT IS IT? · FOR DUMMIES The ERC-3643 standard is like a token with rules. Unlike other tokens that anyone can buy or sell, this one can only be used if you meet certain conditions, such as having verified your identity. It is very useful for representing company shares, bonds or other regulated assets, where the law requires us to know who buys or sells them. WHAT IS IT? · PRO **ERC-3643**, formerly known as **T-REX**, is a token standard on Ethereum and compatible EVM networks designed specifically for the issuance and management of **regulated tokenized assets**, like **stocks, bonds, shares of companies or financial instruments** which require legal movement restrictions. Unlike better known standards such as ERC-20 or ERC-721, ERC-3643 natively incorporates mechanisms of **access control, identity verification (KYC/KYB), AML (Anti-Money Laundering) compliance** and regulatory authorization at the smart contract level. Its architecture is based on a **modular infrastructure composed of specialized contracts** like `IdentityRegistry`, `ClaimTopicsRegistry`, `TrustedIssuersRegistry`, `Compliance` and `Token`. This allows the creation of tokens that can only be transferred if both the issuer and the receiver meet a series of predefined requirements (such as being verified by a trusted issuer, being located in an approved jurisdiction or belonging to a whitelist). In addition, it allows advanced features such as **freezing**, **forcedTransfer**, **recovery (in case of key loss)** and **batchOperations**. These are useful controls for applying the transfer restrictions required by securities rules: **MiFID II** and, in Spain, **Law 6/2023**, with the CNMV as supervisor and a designated ****ERIR** (the entity responsible for registering and recording securities represented by distributed ledger technology, Arts. 7 and 8 of Law 6/2023)** keeping the register (Arts. 7 and 8 of Law 6/2023, BOE-A-2023-7053). This ability to integrate legal compliance directly into the smart contract offers a powerful solution for tokenizing real assets (Real World Assets, RWA) and facilitating their circulation without relinquishing the regulatory control required by the authorities. ERC-3643 is key to building the infrastructure of the **regulated digital finance**, open up new investment models and allow institutional actors to participate in Web3 in a secure, traceable and legal manner. ## 01 / Key points - Standard designed to tokenize regulated assets such as stocks or bonds. - It requires identity validation (KYC/KYB) and legal compliance. - It controls transfers through logic integrated into the contract. - It allows you to recover tokens, freeze them or forcibly transfer them. - Designed for tokens with transfer restrictions. If the token is a financial instrument, it is governed by MiFID II and Law 6/2023, not by MiCA (Art. 2(4) of Regulation (EU) 2023/1114). ## 02 / Advantages - **Compliance built into the contract**: it automatically enforces the transfer restrictions required by regulation, though it does not replace legal analysis or the authorizations the issuance may need. - **Legal and technical certainty** for issuers and investors. - **Modular and flexible**: adapts to different regulatory frameworks and jurisdictions. - **Ideal for real financial assets (RWA)** such as stocks, debt or funds. - **Interoperable in EVM networks** such as Ethereum, Polygon, Arbitrum, or BNB Chain. ## 03 / Disadvantages - **Increased technical and legal complexity** versus standards such as ERC-20. - **You need a validation and issuance infrastructure** (DID, registries, issuers). - **Higher operational and regulatory costs** to other tokens. - **Limited adoption yet** versus simpler standards. - **Requires legal support and specialized consultancy** to implement it properly. RELATED CONCEPTS [Security Token](/en/glosario/security-token) [KYC (Know Your Customer)](/en/glosario/kyc-know-your-customer) [Digital identity](/en/glosario/identidad-digital) [ERIR (Entity Responsible for the Registration and Recording)](/en/glosario/erir-entidad-de-registro-e-identificacion-registral) [Tokenization](/en/glosario/tokenizacion) [Smart contract](/en/glosario/smart-contract) KEEP LEARNING [Complete guide to tokenizing companies on blockchain.](/en/articulos/tokenizacion-empresas-blockchain) [Tokenization under the ERIR: everything you need to know](/en/articulos/tokenizacion-bajo-erir-todo-lo-que-necesitas-saber) [What is the difference between regulated and unregulated tokenization?](/en/articulos/tokenizacion-regulada-vs-no-regulada-diferencias-clave-y-que-debes-saber) [CNMV and tokenization: which companies can issue regulated tokens in Spain?](/en/articulos/cnmv-y-tokenizacion-que-empresas-pueden-emitir-tokens-regulados-en-espana) [How to prevent your project from becoming (unintentionally) a security token?](/en/articulos/como-evitar-que-tu-proyecto-acabe-siendo-sin-querer-un-security-token) RELATED SERVICES [Security Tokens (STO)](/en/servicios/security-tokens) [Asset tokenization](/en/servicios/tokenizacion-activos) [Blockchain consulting for companies](/en/servicios/consultoria-blockchain) [Token issuance](/en/servicios/emision-de-tokens) [Whitepapers](/en/servicios/whitepapers) [Tokenization of real estate](/en/servicios/tokenizacion-de-inmuebles) [Full glossary](/en/glosario) This entry is informative. It is not legal, tax or investment advice. The rules cited change: check the current version on [BOE](https://www.boe.es) and [EUR-Lex](https://eur-lex.europa.eu).