Smart Contracts without surprises: common mistakes in Solidity and how to avoid them
Discover the most common errors when programming smart contracts in Solidity, how to prevent them and what practices to follow.
BLOG · ABOUT THE AUTHOR
Jesús Sánchez Fernández
Founder and CEO of Unknown Gravity (2023) and of HokenFi, the company's platform for tokenizing real-world assets. He leads regulated tokenization projects and security token offerings in Spain under MiFID II and Law 6/2023, with registration through an ERIR.
He has built on blockchain since 2022: Solidity smart contracts, wallets and bridges on Ardor and Polygon as Head of Technology at Tarasca, and he has served as CTO of ZeemGO. He teaches “Real-World Asset (RWA) Tokenization and Institutional Infrastructure” in the Master in Blockchain and Fintech at IEBS Business School, co-organizes Blockchain Málaga and studied Computer Engineering at the University of Málaga.
128 ARTICLES · PAGE 9 OF 11
Articles by
Jesús Sánchez Fernández.
What is a Layer 2 blockchain and what is it used for?
Second-layer networks let Ethereum scale without giving up its security. Learn how they work, which types exist and when to use them.
What is a DAO? Success stories
How DAOs work and what real cases in art, technology and philanthropy show. Learn how they govern decisions and where they struggle.
Web3 marketing strategy: the campaigns that actually work (and why)
A web3 marketing strategy that works in 2026: community before campaigns, the channels that convert (and the ones that don't), and token and NFT mechanics.
Web3 Marketing Success Stories: Lessons from Big Brands
Explore how brands like Nike and Coca-Cola use NFTs and metaverse in Web3 marketing, with innovative strategies.
Gold-based cryptocurrencies: How they work and which ones exist
Compare XAUT and PAXG: which physical gold backs each token, how it is custodied and evidenced, and the risks you take on. Types, uses and open challenges.
DeFi: What decentralized finance is and how does it work
Discover how DeFi revolutionizes finance with blockchain and smart contracts, eliminating intermediaries, promoting transparency
Investing in tokenized real estate: what you buy, how the law protects you and the risks
What you buy when you invest in tokenized real estate (shares or debt of an SPV, not the building), how Spanish law protects you, the risks and tax…
The regulatory challenges of blockchain in different countries
How blockchain regulation differs across countries, from the EU to Asia and the US. Compare the main frameworks and the trends behind them.
How to create your own blockchain-based cryptocurrency
From picking a network to deployment: token on an existing chain or your own chain, supply, permissions and cost. And when the token counts as a security.
Blockchain and the protection of intellectual property
How blockchain can timestamp and evidence the authorship of creative work. Learn what it proves, what it does not and how registries use it.
Decentralization in Blockchain: Transformation, Benefits and Future
What decentralizing actually buys: censorship resistance, transparency and fewer intermediaries, and what you pay in cost, speed and governance overhead.