What are smart contracts?

Smart contracts are self-executing digital agreements written in computer code that exist on blockchain networks. They have become an essential technology in the continued emergence of cryptocurrency, playing a key role in the creation and inner workings of decentralized applications (DApps).

A closer look at smart contracts

Smart contracts are coded digital agreements written to blockchain networks. Once deployed, they typically cannot be altered or deleted. This technology significantly reduces the need for trusted intermediaries when creating and enforcing agreements. Unlike traditional contracts that require lawyers to draft and mediators to oversee disputes, smart contracts' terms are written in publicly auditable, immutable code that automatically executes when specific conditions are met.

These contracts serve as the building blocks of decentralized applications (DApps). Their interoperability allows them to be stacked, creating increasingly sophisticated products that function without oversight or involvement from intermediaries, including their creators. This characteristic has led to the phrase "money lego" being used to describe smart contract-based applications.

The origins of smart contracts

The term "smart contract" was coined by Nick Szabo, a cryptographer, computer scientist, and early digital-money pioneer. In a 1994 essay, Szabo described computerized agreements that would automatically execute when predefined conditions were met. However, the technology to implement these contracts was not available at the time.

The creation of Bitcoin changed this landscape. While Bitcoin allows for simple smart contracts, most are written for blockchains supporting more sophisticated programming languages. Platforms like Ethereum, Solana, Avalanche, Polkadot, and Cardano enable the development of DApps built using smart contracts.

Ethereum, launched in 2015, is widely credited with bringing smart contracts to the crypto space. The project aimed to extend the functionality of the pioneering blockchain technology introduced by Bitcoin in 2009. Ethereum's smart contracts run on the Ethereum Virtual Machine (EVM), a digital software responsible for code execution and smart contract deployment.

How smart contracts work

Smart contracts are written in programming languages such as Solidity, Vyper, and Rust, with Solidity being the most popular for coding Ethereum-based smart contracts. These languages are used to build smart contracts with predefined rules and logic, essentially following an "if X happens, then do Y" structure.

Once written, the code is compiled into a machine-readable format called bytecode. The blockchain can understand bytecode and execute the rules of the smart contract accordingly. As users interact with a contract, the blockchain responds by automatically executing the correct action through a transaction. These transactions are paid for using gas fees.

How smart contracts are used

Smart contracts are the cornerstone of much of the recent blockchain innovation. They have enabled developers to monetize digital artwork and collectibles, and are instrumental in decentralizing the financial (DeFi) industry. Here are some specific examples:

1. Aave: This decentralized, non-custodial borrowing and lending protocol allows users to earn returns and borrow assets by depositing assets into liquidity pools. It also offers flash loans, which are uncollateralized, ultra-short duration loans. Being decentralized and based on a peer-to-peer model, the protocol relies heavily on smart contracts to operate.

2. Civic: This personal identity verification service uses smart contracts to provide secure and low-cost identity verification. The project gives users total access to and control over their personal identity information, enhancing privacy in digital interactions. Civic is built on the Solana blockchain, a major competitor to the Ethereum platform.

3. A popular decentralized exchange: This leading decentralized exchange relies on smart contracts for the smooth operation of liquidity pools within its automated market makers. Smart contracts are coded to determine the price of a liquidity pool's tokens at any given time, allowing trades to be completed in an entirely decentralized manner.

Conclusion

Smart contracts are undoubtedly the backbone of the modern crypto space, fundamental to the operations of DApps and the pioneering projects built around them. By removing the need for centralized intermediaries, this technology supports a key pillar of crypto - decentralization. As demonstrated by the examples provided, smart contracts are being used in various ways, with new use cases continuously emerging. Their importance to the industry cannot be overstated, and they will likely continue to play a crucial role in shaping the future of blockchain technology and decentralized finance.

FAQ

What are smart contracts?

Smart contracts are self-executing digital agreements coded on blockchain. They automate transactions, eliminate intermediaries, and ensure transparency and security.

What is an example of a smart contract?

A classic example is a DeFi loan agreement on Ethereum that automatically executes loan terms when conditions are met.

How risky are smart contracts?

Smart contracts carry significant risks due to potential code vulnerabilities, legal uncertainties, and operational challenges. However, proper auditing and governance can mitigate these risks.

What is a smart contract vs blockchain?

Blockchain is a secure, transparent ledger, while smart contracts are self-executing code on the blockchain that automate agreements. Blockchain provides the foundation, and smart contracts use it to execute agreements automatically.