Blockchain Developer | Backend Engineer | Web3 Specialist | Open Source Contributor
📍 Tehran, Iran 🇮🇷

I'm a software engineer passionate about blockchain technology, cryptocurrency infrastructure, and decentralized systems. I actively contribute to major open-source projects in the Web3 ecosystem and specialize in building secure, scalable financial infrastructure.

With deep expertise in Go, TypeScript, and Python, I focus on:

• 💰 Blockchain Wallet Development - Multi-chain wallet design and implementation
• 🔐 Cryptographic Security - Key management, signature schemes, and secure storage
• 🏗️ Backend Architecture - Scalable APIs and distributed systems
• 🌐 Cross-Chain Protocols - Interoperability and DeFi integrations
• 🛡️ Security Hardening - Input validation, encryption, and attack prevention

Multi-chain cryptocurrency wallet library supporting 100+ blockchains

• 🔗 wallet-core - Cross-platform wallet library
• Key Contributions:
  • 🔒 Security hardening for address validation across multiple chains
  • 🛡️ Encryption parameter improvements and PBKDF2/Scrypt optimization
  • 📝 TRON transaction signing and address format validation
  • ✅ Input validation and NUL byte rejection for attack prevention
  • 🔑 Key storage and encryption enhancements
  • ⛓️ Multi-chain support: Ethereum, Solana, TRON, Bitcoin, Aptos, Ripple, etc.

Official Go implementation of the Ethereum protocol

• 🔗 go-ethereum
• Contributions to blockchain consensus and smart contract execution

Go SDK library and RPC client for Solana Blockchain

• 🔗 solana-go
• Blockchain interaction and transaction building

SatoshiLabs Improvement Proposals - Cryptocurrency standards

• 🔗 slips
• Contributing to protocol standards and specifications

• Wallet Architecture - Design and implementation of multi-chain wallets
• Cryptographic Operations - ECDSA, Scrypt, PBKDF2, AES encryption
• Security Protocols - Key derivation, storage, and recovery mechanisms
• Transaction Signing - Cross-chain signing, PSBT, and raw transaction handling
• Address Validation - Format verification across 50+ blockchain networks
• Protocol Standards - BIP32, BIP39, SLIP44 implementation
• Backend Systems - REST APIs, real-time monitoring, data aggregation

I'm deeply committed to secure software development and focus heavily on:

• ✅ Input validation and boundary checking
• ✅ Protection against common attacks (injection, buffer overflow, etc.)
• ✅ Secure key management and memory protection
• ✅ Cryptographic best practices
• ✅ Error handling and exception safety
• ✅ Code auditing and security reviews

• 📊 LinkedIn: sina-haseli
• 💻 GitHub: @sina-haseli
• 📧 Email: Open on LinkedIn

• Advancing security in multi-chain wallet implementations
• Contributing to blockchain protocol improvements
• Exploring zero-knowledge proofs and privacy protocols
• Building scalable DeFi infrastructure
• Expanding cross-chain interoperability solutions

• 🔐 Advanced Cryptography - ZK-proofs, threshold signatures, MPC
• ⛓️ Blockchain Consensus - Proof-of-Stake, validator infrastructure
• 🌉 Cross-Chain Bridges - Secure asset transfers and atomic swaps
• 🚀 Layer 2 Scaling - Optimistic and ZK rollups
• 💡 Smart Contract Security - Audit methodologies and formal verification

I believe in building secure, open, and interoperable blockchain infrastructure. By contributing to open-source projects, I aim to strengthen the entire Web3 ecosystem and make decentralized technologies more accessible and secure for everyone.

"The best way to predict the future of blockchain is to build it together."

• 🔐 Cryptography enthusiast with a passion for secure systems
• 🌍 Advocate for open-source blockchain development
• 📚 Continuous learner of emerging Web3 technologies
• 🎯 Focused on real-world security impact
• ☕ Coffee-driven developer
• 🚀 Always exploring the next frontier in decentralized tech

"Securing the infrastructure for Web3" 🛡️

Last updated: June 2026