L1 Secured W2W E2EE Immutable dMail & dChat

Multi-chain technology that enables 1000s of dMail & dChat dApps to evolve on Web3.

// Send mail over Ethereum network
const ethereum = new Ethereum(signer);
const envelope: Envelope = {...};
const tx = ethereum.mail.send(envelope);


Getting started

Learn about immutable on-chain communication, build on top of our protocol stack or utilize the power of our dMail & dChat white labels.


Learn how to easily integrate our protocols into your product


Step-by-step guides to setting up your white-label UI

This documentation library serves as a guide for developers and solutions users that are getting started with 4thTech. The documentation library also serves as a location to explore and understand the solutions and all the different resources available to assist with integration or system usage.



Block Labs Luxembourg does the core research and development of the on-chain communication technology.

4thTech acts as a Web3 dedicated initiative, enabling the further permissionless development of various dMail and dChat solutions on top of the Block Labs technology stack.


4thTech combines several advanced technologies that enable 1000s of dMail & dChat dApps to evolve on Web3 via SDKs.

The core two protocols (FOURdx, FOURim) combine blockchain, encryption, and decentralized storage to enable true immutable decentralized communication. The underline innovation meets within the project's core primitives described below.

Core primitives

We utilize Web3 to enable secure communication within on-chain W2W E2EE dMail, dChat & data file exchange, which is currently non-existing in traditional Web2 applications.

Behind the scenes, we enable any project to integrate the dMail, dChat & Web3Transfer solutions into their products using the SDK framework. At the same time, our multi-chain interoperability and deployment pave the way toward the first Web3 communication standard.

On-chain communication

The dChat W2W message exchange happens on-chain as one short message represents one L1 blockchain transaction.

As dMail is data heavier, lite encrypted JSON objects are created to hold dMail metadata. The link to this metadata and checksum are recorded on-chain as an L1 blockchain transaction.

So again, the core primitive described by the formula below applies.


1 email/message = 1 L1 blockchain transaction


Every wallet becomes an on-chain identity, and the message data vault can be accessible/decrypted only with users' private keys!


Not your keys = not your data


By putting communication on chain results in the immutability of messages, which is currently non-existent in traditional applications.

True dMail & dChat security is achieved by utilizing blockchain security, encryption, and decentralized storage.


Blockchain security + encryption + decentralised storage = immutable decentralised communication