Mark Emery
Patent Co-Inventor

Blockchain Developer

Building production-ready blockchain systems that solve real security problems in cryptocurrency custody.

Key Achievements

Co-inventor on provisional patent for quantum-resistant cryptocurrency custody

Architected 7-service production infrastructure for enterprise Ethereum custody

Built full-stack DeFi applications from smart contracts to user interfaces

About

I build production-ready blockchain systems that solve real security problems in cryptocurrency custody. Most recently, I co-invented and patented EthLock in collaboration with David DeMayo, CTO of Syntropy Software—a quantum-resistant Ethereum custody solution combining time-locks, multi-signature authorization, and orchestrated workflows.

Traditional cryptocurrency custody forces users to choose between security and usability. Custodial solutions require surrendering control. Self-custody demands technical expertise. EthLock solves this with workflow orchestration—users maintain complete control while the system guides them through complex custody operations step-by-step.

I develop full-stack blockchain applications from smart contracts to user interfaces. My technical expertise spans Solidity smart contract development, Python and Node.js backend architecture, React frontend development with MetaMask integration, and blockchain infrastructure including The Graph protocol and real-time indexing.

I approach development with a production-first mindset: no placeholder code, comprehensive error handling, cross-platform compatibility, and professional documentation. Whether architecting microservices for enterprise custody or building analytics dashboards for decentralized networks, I focus on systems that work in real-world conditions.

Core Expertise

Smart Contract Development
Full-Stack Blockchain
Cryptographic Security
Microservices Architecture
Production Deployment

Patent

Provisional Patent Filed

Quantum-Resistant Cryptocurrency Custody System

USPTO • Co-inventor with David DeMayo

Projects

EthLock - Native Ethereum Time-Locking and Signature-Based Access Control Using Quantum-Resistant Keys and Zero-Knowledge Workflow Coordination

EthLock - Native Ethereum Time-Locking and Signature-Based Access Control Using Quantum-Resistant Keys and Zero-Knowledge Workflow Coordination

A quantum-resistant, zero-knowledge, multi-signature, on-chain, non-custodial Ethereum time-lock system enabling native access control through coordinated, resumable multi-party workflows.

Solidity
Python
Node.js
React
PostgreSQL
Docker
DePIN Simulator

DePIN Simulator

Complete decentralized physical infrastructure network simulator

Solidity
The Graph
React
Recharts
Hardhat
Approval Manager

Approval Manager

DeFi security tool for managing token approvals

Solidity
Hardhat
Docker
Web3.js
capICO - Token Sale Platform

capICO - Token Sale Platform

Production-grade Initial Coin Offering platform

Solidity
OpenZeppelin
Hardhat
React
Web3.js
URDEX - Dual AMM DEX Platform

URDEX - Dual AMM DEX Platform

Decentralized exchange with dual AMM architecture

Solidity
AMM protocols
Hardhat
React
Web3.js

Technical Skills

Smart Contracts & Blockchain

Solidity, Hardhat, time-locks, multi-signature patterns
ERC-20, ERC-721, ERC-1155 token standards
Gas optimization, security best practices
Ethereum, test networks, mainnet deployment

Backend Development

Python (Flask, SQLAlchemy)
Node.js, Express, RESTful APIs
PostgreSQL, database design
JWT authentication, microservices

Frontend Development

React, TypeScript, Next.js
MetaMask integration, Web3.js, ethers.js
Tailwind CSS, responsive design
State management, wallet connectivity

Blockchain Infrastructure

The Graph protocol, subgraph development
Real-time blockchain indexing
Mainnet forking, testing frameworks
Docker, cross-platform development

Security & Cryptography

Quantum-resistant cryptography
Reentrancy protection, access control
Approval management, exploit prevention
Production-grade error handling

Experience

Software Developer

Full-stack blockchain application development

Smart contract architecture and implementation

DeFi and custody solution development

Client consultation and project delivery

Full Stack Blockchain Developer

G.C.M., LLC.

2024-Present

Blockchain consultation and strategic advisory

Web3 wallet setup and user education

Blockchain integration into enterprise and legacy systems

Staff Developer, Engineering Department

BlockLock, Inc.

February 2025-October 2025

Smart contract architecture and development

Decentralized application design and implementation

Comprehensive testing processes and quality assurance

Full-stack blockchain development

Professional Musician / Trumpet Artist

American Federation of Musicians, Local 9-535

1994-Present

Fulfilling pension-eligible contracts for performance since 1996

International performance, recording and touring with major artists and entities including Boston Pops, Star Wars in Concert, Major League Baseball, National Hockey League and performances at Carnegie Hall, Lincoln Center, Tanglewood and Wolftrap

Recording for Deutsche Grammphon, Mode Records, Arsis Audio, GCM Records

Negotiating member on collective bargaining agreements for AFM Local 9-535

Education

MIT Sloan School of Management

Blockchain Technologies: Business Innovation and Application

Certificate Program

Avalanche Academy

L1 Tokenization, Multichain Architecture, Interchain Messaging

Certificate Program

Blockchain Mentorship Program

Dapp University - Advanced Mentorship

Certificate Program

Blockchain Council

Solidity Developer Certification

Certificate Program

Dapp University

Blockchain Developer Bootcamp 2.0

Certificate Program

New England Conservatory

Master of Music

Advanced studies, with honors

Portland State University

Bachelor of Arts in Music

Comprehensive liberal arts education

Get in Touch

I'm always open to discussing blockchain projects, enterprise custody solutions, or opportunities to collaborate on innovative DeFi applications.

📱

Phone

(617) 501-1446

Latest Article

Tier-Based Token Sales: How Smart Contracts Can Enhance Your Strategy

An in-depth look at implementing tiered token sale structures using smart contracts for optimal fundraising outcomes.