Publications

End-to-End Encrypted Messaging with go-accord

Go BIP32 ECDH PBKDF2 AES ECDSA Cryptography

A secure, local, offline, end-to-end encrypted messaging for private communication. Built with Go, it features BIP32 hierarchical key derivation, ECDH key agreements, and AES-256 encryption and uses a custom YAML-based file format for profiles, contacts and messages.

08 April 2026

dotsig: Digital signatures on the fly

C++ ECDSA PKCS Digital Signatures

The dotsig software lets you create and verify digital signatures using RSA cryptography (PKCS1 v1.5), PGP and elliptic-curve cryptography (ECDSA). The name originates from already known Linux tools and packages like dotenv. Pipe text or files from stdin over to dotsig to produce digital signatures, as simple as it gets!

22 January 2026

Smaili the Micro Rover

C++ ESP32 Arduino 3D Models

A tiny smiling () rover that speaks JSON! This publication contains the firmware source code (C++) for a ESP32 DEVKIT V1 board which is wired together with listed components. Note that for practicability, the ESP32 board is plugged on a 10:30 prototyping breadboard and attached to the bottom plate of the rover platform.

17 January 2026

Hands-On Cryptography with C++

Cryptography C++ Crypto++ Botan TLS HTTPS

In Hands-On Cryptography with C++ you’ll find all the tools and snippets necessary to design and build the cryptography of today. With a scope ranging from demystifying encryption algorithms to building secure software using Crypto++ or Botan, this course teaches you all you need to know to build cryptographic concepts with C++.

29 August 2025

Use Case: Driving the digitization of society

Blockchain cryptocurrency digital society metaverse

Follow me on a journey featuring smart contracts and dapps, collectibles museum, online fitness centers, the metaverse(s) and some insights on how blockchain use cases will shape the [virtual] landscape of the future. This publication takes you on a digital tour to discover the metaverse and virtual land of the future.

28 March 2023

Exploring Smart Accounts with ERC-4337

Blockchain cryptocurrency smart accounts Ethereum ERC-4337

Ethereum is moving forward every day with many contributors at work, defining new standards for tokens or processes using the technology. Lately, one of the EIPs, or Ethereum Improvement Proposal, which has seen most discussions around is ERC-4337. This publication explains ERC-4337 and why it made the buzz lately!

09 March 2023

22 smart contracts examples to watch in 2023

Blockchain cryptocurrency smart contract Ethereum

Let us take you on a journey in a digitized society with your privacy, ownership and rights – always in mind. A society, that is not run by computers, much rather a society that is enabled by computers. This publication illustrates examples of smart contracts and describes how these could be useful to society today.

01 March 2023

dHealth AMA: What makes our protocol different?

Blockchain cryptocurrency smart contract dHealth Healthcare

In this podcast with dHealth, I answer to an AMA - short for Ask Me Anything - about the blockchain protocol and about how the community can join in building the future of healthcare. This podcast goes on about some of the feats that make dHealth Network so attractive as a public blockchain infrastructure for Healthcare.

02 August 2022

Making blockchain real: Short-lived smart contracts

Blockchain cryptocurrency smart contract MBR

In this third episode of the Making blockchain real (MBR) Series, we take a look at Disposable Smart Contracts and apply their utility using a blockchain (P2P) network. These smart contracts are said to be "ephemeral" or "short-lived" because their lifecycle is limited. This publication illustrates this with examples.

03 January 2022

Making blockchain real: Swapable automated liquidity pools

Blockchain cryptocurrency atomic swap MBR

In this second episode of the Making blockchain real (MBR) Series, we take a look at Swapable, which is an open standard that I defined based on the Uniswap project. We have released a reference implementation in a library we called Swapable. This publication describes the library and general liquidity pool features.

02 January 2022

Making blockchain real: Explaining Bitcoin

Blockchain bitcoin cryptocurrency network MBR

In this first episode of the Making blockchain real (MBR) Series, we take a look at Bitcoin, and put light on some of the ideas that flourished with the publication of its whitepaper by Satoshi Nakamoto. This publication showcases kernel features such as Mining and Block difficulty in a simplistic way for any developer.

01 January 2022

Integrity in the era of data

Blockchain data security digital signature

In modern times – in today’s digitized world – data is often compared to gold. But who secures the integrity of today’s gold? Do you have a way of making sure your data wasn’t maliciously changed? Do you earn money or interests on your sharing of data? This publication illustrates how you must care about your data, a LOT.

12 October 2021

How digital signatures work in blockchain

Blockchain digital identity digital signature

At the heart of blockchain networks lays a Public Key Infrastructure (PKI) that foresees the use of a pair of keys, of which one end – the public key – is intended to be public and the other end – the private key – is held only by the signer in person. In this publication, you'll find out how blockchain and PKI match.

01 October 2021

Symbol from NEM: The ultimate guide to start harvesting blocks

Blockchain cryptocurrency NEM source code Symbol

In this publication, you will walk through the process of enabling your account(s) to harvest BLOCKS on the Symbol from NEM blockchain network or compatible networks like dHealth Network. This publication illustrates different techniques such as using a Wallet software to enable harvesting or using a command-line tool.

06 April 2021

Symbol from NEM: Powering Possibility

Blockchain cryptocurrency NEM source code Symbol

Distributed, Fast, Secure; The LEGO of blockchains is back with more building blocks; From Public assets, to distributed name zones via network-wide account and assets restrictions, metadata and cross-chain atomic swaps features – Symbol from NEM is all you need from a blockchain network - and it's now LIVE and PUBLIC.

17 March 2021

How to use blockchain for your ecommerce?

Blockchain cryptocurrency digital business e-commerce

Wondering how to use blockchain for your e-commerce? Here is a simplistic showcase applying the features of blockchain and cryptocurrency in ecommerce software such as WooCommerce or Shopify. This publication illustrates a couple useful features of blockchain networks that you can use in your own shopping website.

01 March 2021

What are Hierarchical Deterministic Wallets (HD Wallet)?

Blockchain cryptocurrency hd wallet

Blockchain and cryptocurrency wallet software come with a steep learning curve. In this article we will demystify hierarchical deterministic wallets (also referred to as HD wallets), as introduced in Bitcoin Improvement Proposal 32 (BIP32). Our team also defined an open standard about this topic, read in to find out.

26 February 2021

How to use blockchain for your business?

Blockchain cryptocurrency digital business

Ever tried to use blockchain for your business? In this article we’ll illustrate how to use blockchain features and map them to operational and functional processes of running a business. With the aim to operate safely, transparently and cost efficiently, this publication illustrates how business and blockchain match.

24 February 2021

How to use blockchain to tokenise your supply chain?

Blockchain cryptocurrency digital business tokenization

Ever tried to use blockchain to tokenise a business' supply chain? Find out here, how to use blockchain features, map them to a business data layer – to ultimately operate your supply chain with more cost efficiency. This publication walks you through examples of tokenization, governance and other blockchain features.

15 February 2021

NIP 16 - Components Library for Symbol from NEM

Blockchain components smart contracts

This publication defines a technical specification of a components library for direct coupling of Software with Symbol from NEM. It facilitates and accelerates the process of integration of Symbol from NEM or dHealth Network in Client Software such as Wallets, Explorers, dApps (distributed apps) and/or Smart Contracts.

19 June 2020

Grégory Saive at Consensus 2020 - NEM Security Tokens

Blockchain cryptocurrency NEM Consensus

In this talk at Consensus 2020, I presented Symbol from NEM and some of its characteristics to scale fast, as well as an open standard for Security Tokens using the technology. The talk was held remotely (during COVID times) and includes an example usage of such security tokens to track business investments on the market.

19 May 2020

NIP 13 - Security Token Standard for Symbol from NEM

Blockchain security token NFT tokenization

This publication defines a standard for the issuance and management of security tokens and NFTs using Symbol from NEM technology. This standard is structured as such that standard interfaces are defined to facilitate operations and interrogations related to security tokens and NFTs using compatible blockchain networks.

29 July 2019

Catapult: Behind the code with Grégory Saive

Blockchain cryptocurrency NEM Catapult

Catapult- Behind the Code is a series by Alexis Trujillo to interview the developers involved in the development of the next evolution of NEM´s Blockchain. This technology and its new features are explained by NEM´s finest. In this episode we talk to Grégory Saive, Head of Development of the NEM Foundation.

19 July 2019

NIP 8 - Symbol Technology Release for Public Network

Blockchain migration NEM Symbol

This publication defines a decision making process about upgrading the current public blockchain network NEM (NIS1) with the newly available Symbol Technology for Symbol from NEM (Catapult). With 4 years of uptime at the time of writing, the NEM blockchain is one of the prominent distributed ledger solutions available.

10 May 2019

NIP 6 - Multi-Account Hierarchy for Deterministic Wallets

Blockchain deterministic wallets hd wallet

This publication defines a standard for hierarchical deterministic wallets for Symbol from NEM. It uses Bitcoin's BIP32, BIP39, BIP43, BIP44 and SLIP-10 as sources for documentation purpose. This standard improves handling of wallets with NEM and compatible P2P networks including dHealth Network and Symbol from NEM.

09 April 2019

In signo veritas - Einstieg in die Public-Ledger-Entwicklung mit NEM

Blockchain NEM Games Smart Contracts Node.js

Printed article in the german iX magazine by Heise Verlag (heise.de). This publication introduces PacNEM, a blockchain-first browser game that uses cryptocurrency to reward players and showcases some use cases for tokens and blockchain networks in the gaming industry, including a Pay-to-Play and Sponsored-Play feature.

18 July 2018

NIP 7 - QR Library Standard Definition

Blockchain NEM Symbol Smart Contracts

This publication defines a QR-Code Standard that allows for generating different types of QR codes for smart contacts, for wallet backups and/or for offline transaction requests (offline smart contracts). This standard defines a cross-client and cross-network QR-code standard alongside a reference implementation in TS.

15 July 2018

Developing Games or Applications with the NEM Blockchain and Node.js

Blockchain NEM Games Smart Contracts Node.js

Linking a blockchain to a game or application development project is a little more complicated than what you might think as it requires a good understanding of Peer-to-Peer (P2P) networks, brought back to life with blockchains. Using such technology can be challenging at times- this publication shall help you at it.

29 July 2017