A smart contract is a computer program stored and executed on a blockchain that can automatically perform actions when

predefined conditions are satisfied.

Instead of relying entirely on a person or organization to carry out an agreement, a smart contract uses code and blockchain infrastructure to enforce programmed rules.

A simple way to think about one is:

IF this condition is satisfied → THEN perform this action.

For example:

IF payment is received → THEN transfer the digital asset.

Smart contracts are one of the fundamental technologies behind decentralized applications, decentralized finance, token systems, blockchain games, digital ownership systems, and many other Web3 applications.

Ethereum describes smart contracts as programs that run on the blockchain and highlights their permissionless nature and composability as important properties.

QUICK ANSWER

A smart contract is a blockchain-based program that automatically executes programmed instructions when specified conditions are met.

A smart contract can:

Receive information
Verify conditions
Store data
Transfer digital assets
Calculate values
Enforce rules
Interact with other contracts
Trigger other blockchain transactions
Control access to digital resources
Automate business processes

The basic model is:

CODE → CONDITIONS → BLOCKCHAIN EXECUTION → RESULT

Unlike a traditional contract, a smart contract is not simply a document describing an agreement.

It is executable software.

Why Is It Called a Smart Contract?

The name can be slightly misleading.

A smart contract is not necessarily:

Intelligent
Capable of understanding language
Able to negotiate
Legally equivalent to a contract
"Smart" in the artificial-intelligence sense

The word smart refers primarily to automation.

The word contract refers to the fact that the program can encode rules governing an interaction.

A better mental model is:

A smart contract is an automated blockchain program that enforces rules through code.

How Does a Smart Contract Work?

A simplified smart-contract process looks like this:

USER
  ↓
TRANSACTION
  ↓
SMART CONTRACT
  ↓
CHECK CONDITIONS
  ↓
EXECUTE CODE
  ↓
UPDATE BLOCKCHAIN STATE
  ↓
RESULT

Suppose a smart contract is designed to release a digital asset when a payment is received.

The process could be:

Buyer sends payment
       ↓
Blockchain verifies transaction
       ↓
Smart contract checks payment
       ↓
Condition satisfied
       ↓
Contract executes
       ↓
Digital asset transferred

The important point is that the rules are executed by software running within a blockchain environment.

What Is the "IF/THEN" Principle?

One of the easiest ways to understand smart contracts is through conditional logic.

Imagine:

IF a buyer sends 1 ETH

THEN transfer a specific digital asset to the buyer.

Or:

IF a loan repayment is received

THEN update the loan balance.

Or:

IF a voting deadline has passed

THEN prevent additional votes.

These are examples of programmed conditions.

The actual software can be considerably more sophisticated, but the fundamental idea remains:

Conditions → Rules → Execution

Where Do Smart Contracts Live?

Smart contracts are deployed onto compatible blockchain networks.

Once deployed, the contract has an address that users and other applications can interact with.

For example, on an Ethereum-compatible network, a decentralized application might interact with a smart contract through a blockchain wallet or application interface.

The blockchain provides the execution environment and shared state.

This means the application does not necessarily depend on one company's private database to determine what happened.

What Makes Smart Contracts Different From Normal Software?

A normal application might run on:

Your computer
A company's servers
A cloud platform
A private database

A smart contract runs within a blockchain environment.

This creates different properties.

Traditional Software	Smart Contract
Usually controlled by an operator	Often designed for permissionless interaction
Can use private databases	Uses blockchain state
Server can be changed by operator	Deployed code may be difficult or impossible to change
Can often be modified centrally	Changes depend on contract design and governance
Transactions can be reversed by an operator	Blockchain execution follows protocol and contract rules
Typically uses conventional APIs	Can interact with blockchain protocols and other contracts

These differences are why smart contracts are useful for decentralized systems.

What Is Blockchain State?

To understand smart contracts, you need to understand the idea of state.

Blockchain state represents information currently recorded by the network.

Depending on the blockchain and application, state can include:

Account balances
Token ownership
Contract data
Voting results
Loan balances
Permissions
Application settings

When a smart contract executes, it can change this state according to its programmed rules.

For example:

Before transaction:

Alice → 10 tokens
Bob   → 5 tokens

Transaction:

Alice sends 2 tokens to Bob

After transaction:

Alice → 8 tokens
Bob   → 7 tokens

The blockchain records the resulting state.

What Is a Smart Contract Transaction?

A transaction is an instruction submitted to the blockchain.

For example, a user might:

Connect a wallet
Select an action
Approve a transaction
Sign it
Broadcast it to the network
The blockchain processes it
The smart contract executes
The blockchain records the result

The user's wallet is therefore often the interface through which people interact with smart contracts.

What Is Gas?

Many blockchain networks charge computational fees for executing transactions.

On Ethereum, these fees are commonly referred to as gas fees.

Gas represents the computational resources required to execute operations.

A more complicated smart contract operation may require more computation than a simple transaction.

Therefore:

More computation → More gas required

Gas fees help prevent unrestricted use of network resources.

They also create an economic mechanism for allocating scarce blockchain computation.

Why Can't a Smart Contract Simply Do Anything?

Smart contracts operate within the rules and limitations of their blockchain environment.

They generally cannot simply:

Access arbitrary websites
Read your private computer files
Call any Internet API directly
Know real-world events automatically
Change blockchain rules by themselves

This limitation is extremely important.

A smart contract needs reliable mechanisms for interacting with information outside its blockchain.

That leads to the concept of oracles.

What Is a Blockchain Oracle?

A blockchain oracle provides external information to a blockchain application.

For example, a smart contract might need:

Weather information
Currency exchange rates
Stock prices
Sports results
Election results
Supply-chain information

The smart contract itself does not automatically know these things.

An oracle system can provide the required information.

The conceptual architecture is:

Real World → Oracle → Blockchain → Smart Contract

This makes oracles an important bridge between blockchain systems and external information.

What Can Smart Contracts Do?

Smart contracts can support many types of applications.

1. Token Systems

Smart contracts can define rules governing blockchain-based tokens.

These rules may include:

Supply
Transfers
Ownership
Permissions
Minting
Burning
Governance

2. Decentralized Finance

Smart contracts form the foundation of many decentralized-finance systems.

They can be used for:

Lending
Borrowing
Swapping assets
Liquidity pools
Automated market systems
Collateral management
Stablecoin mechanisms
Derivatives

The important concept is that financial rules can be encoded into software.

3. Decentralized Applications

A dApp, or decentralized application, is an application that uses decentralized infrastructure.

A dApp may have:

Frontend → Wallet → Smart Contract → Blockchain

The user interacts with the application interface while the smart contract handles blockchain-based logic.

4. Digital Ownership

Smart contracts can establish blockchain-based records of ownership.

Examples include:

Digital collectibles
Tokenized assets
Membership tokens
In-game items
Certificates
Digital credentials

This does not automatically mean that a blockchain token represents legally recognized ownership of a real-world asset. Legal rights depend on the specific system and jurisdiction.

5. Governance

Organizations and communities can use smart contracts to encode voting rules.

For example:

Proposal created → Eligible participants vote → Votes counted → Result determined

More sophisticated systems can include:

Voting power
Quorum requirements
Proposal thresholds
Voting deadlines
Delegation
Execution rules

This is one foundation of decentralized autonomous organizations, or DAOs.

6. Blockchain Games

Smart contracts can manage:

Game assets
Player ownership
Rewards
Marketplaces
Tournament rules
In-game economies

A blockchain game can therefore combine conventional game software with blockchain-based ownership and economic logic.

7. Escrow

A smart contract can hold assets until predefined conditions are met.

For example:

Buyer deposits funds
       ↓
Smart contract holds funds
       ↓
Required condition satisfied
       ↓
Funds released

This can reduce the need for a conventional intermediary in some types of transactions.

What Is a dApp?

A decentralized application, or dApp, is an application that uses decentralized infrastructure, often including smart contracts.

A simplified architecture is:

USER
 ↓
WEB / MOBILE INTERFACE
 ↓
WALLET
 ↓
SMART CONTRACT
 ↓
BLOCKCHAIN

The interface may look similar to a conventional website.

The major difference is that some application logic and state are handled through decentralized infrastructure.

What Is Smart-Contract Composability?

One of the most powerful characteristics of blockchain applications is composability.

A smart contract can interact with other smart contracts.

For example:

Application A
     ↓
Smart Contract B
     ↓
Protocol C
     ↓
Token Contract D

This means developers can build applications from existing blockchain components.

It is similar to software libraries and APIs, but the components can operate within the same blockchain environment.

Ethereum explicitly identifies composability as one of the important properties of smart contracts.

This can accelerate innovation.

It can also increase risk because a vulnerability or failure in one dependency may affect applications that depend on it.

Are Smart Contracts Actually Contracts?

Not necessarily in the legal sense.

A smart contract is primarily software.

Whether the code also constitutes a legally enforceable agreement depends on factors such as:

Jurisdiction
Contract structure
Parties involved
Applicable law
Regulatory requirements
The underlying transaction

Therefore:

Smart contract ≠ automatically legal contract.

The distinction matters especially when blockchain applications interact with real-world assets, businesses, financial services, or regulated activities.

Can Smart Contracts Be Changed?

It depends on how the contract was designed.

Some contracts are effectively immutable after deployment.

Others use upgrade mechanisms.

For example, a system may include:

Upgradeable contracts
Proxy patterns
Governance controls
Multisignature authorization
Emergency pause mechanisms

This creates an important design trade-off.

More immutability

Can provide:

Predictability
Resistance to unilateral changes
Stronger guarantees

But it can make:

Bug fixes
Security patches
Feature upgrades

more difficult.

More upgradeability

Can provide:

Flexibility
Bug fixes
Improvements

But it introduces additional trust and governance considerations.

Therefore, users should understand who can change a contract and under what conditions.

What Is Smart-Contract Security?

Smart-contract security is the practice of designing, testing, auditing, and operating blockchain programs so that they behave safely under expected and unexpected conditions.

This is especially important because blockchain transactions can be difficult or impossible to reverse.

Ethereum's 2026 Trillion Dollar Security Project identifies smart-contract security as one of the major security areas that must improve as blockchain systems seek broader adoption.

Common Smart-Contract Risks

1. Coding Bugs

A programming error can cause unexpected behavior.

2. Reentrancy

A vulnerable contract can sometimes be manipulated when external calls allow execution to re-enter a function before the original operation has completed.

This is a classic smart-contract security problem.

3. Access-Control Errors

A function might accidentally be available to users who should not have permission to execute it.

4. Arithmetic Problems

Poorly designed calculations can produce unexpected results.

Modern development languages and tools provide protections, but developers still need to understand numerical behavior.

5. Oracle Manipulation

If a contract relies on external information, manipulation or failure of the information source can affect the application's decisions.

6. Economic Attacks

A contract may technically work exactly as programmed but still have an economic weakness.

Attackers can sometimes exploit:

Incentives
Market structures
Liquidity conditions
Pricing mechanisms
Governance systems

7. Upgrade Risks

An upgrade mechanism may introduce additional trust assumptions or become a target for attackers.

8. Dependency Risks

A contract may depend on other contracts, bridges, or infrastructure.

A problem elsewhere in the system can therefore affect the application.

How Are Smart Contracts Tested?

Professional smart-contract development requires more than writing code.

A typical process may include:

Specification → Coding → Unit Testing → Integration Testing → Security Analysis → Testnet Deployment → Audit → Mainnet Deployment → Monitoring

Developers may use:

Automated tests
Static analysis
Fuzz testing
Formal verification
Test networks
Independent security audits
Bug bounty programs
Monitoring systems

The goal is to discover problems before they become expensive or dangerous.

What Programming Languages Are Used?

The language depends on the blockchain.

For Ethereum and many EVM-compatible networks, Solidity is one of the most widely used smart-contract languages.

Other blockchain ecosystems use different languages and virtual machines.

Examples include:

Solidity
Vyper
Rust
Move

The programming language is only one part of the skill set.

A developer also needs to understand:

Blockchain architecture
Cryptography
Transactions
Wallets
Gas
Security
Testing
Distributed systems
Application architecture

What Is an EVM?

The Ethereum Virtual Machine (EVM) is the execution environment used by Ethereum for smart contracts.

You can think of it as the computational environment in which Ethereum smart-contract code runs.

Many other networks are compatible with the EVM, allowing developers to reuse concepts, tools, and often code across multiple ecosystems.

This is one reason EVM development remains an important part of blockchain development.

What Is Layer 2 and Why Does It Matter for Smart Contracts?

Blockchain applications can face limitations involving:

Transaction throughput
Cost
Latency
Network capacity

Layer 2 networks are designed to help scale blockchain activity.

Ethereum's current scaling architecture uses Layer 2 networks, including rollups, to process transactions more efficiently while using Ethereum as part of the underlying security and settlement model.

As of September 2026, Ethereum's ecosystem includes multiple Layer 2 networks with different characteristics and maturity levels.

This matters to smart-contract developers because applications may increasingly be deployed across:

Layer 1 + Layer 2 + Interoperability Infrastructure

Rather than assuming that one blockchain will handle every application.

Smart Contracts and Scaling

The evolution of blockchain infrastructure is increasingly focused on making smart-contract applications:

Cheaper
Faster
More scalable
Easier to use
More interoperable

Ethereum's 2026 protocol priorities include scaling, user experience, and hardening the core protocol.

The Ethereum Foundation also describes Layer 2 networks as increasingly providing differentiated features, customization, and specialized onchain economies rather than simply serving as a mechanism for cheaper transactions.

This means the future of smart contracts is likely to involve increasingly diverse execution environments.

What Is Account Abstraction?

Account abstraction is an approach to making blockchain accounts more programmable and easier to use.

Traditional blockchain wallets can expose users to concepts such as:

Private keys
Gas fees
Network switching
Transaction signing

Account abstraction can enable more sophisticated wallet behavior.

Examples include:

Transaction batching
Gas sponsorship
Social recovery
Programmable spending rules
Smart-contract wallets

Ethereum's 2026 protocol priorities specifically identify native account abstraction and interoperability as important user-experience areas.

This could make smart-contract applications feel more like conventional Internet applications.

Smart Contracts and Artificial Intelligence

AI and smart contracts solve different problems.

AI provides intelligence and prediction.

Smart contracts provide programmable blockchain execution.

They can therefore complement each other.

For example:

AI analyzes data
      ↓
AI produces a result
      ↓
Blockchain application verifies permitted conditions
      ↓
Smart contract executes action

Potential applications could include:

AI-powered financial automation
Autonomous software agents
Machine-to-machine payments
Data marketplaces
Automated business workflows
Intelligent decentralized applications

However, AI outputs can be incorrect, so systems that use AI to trigger financial or physical consequences need carefully designed safeguards.

Smart Contracts and Real-World Assets

Smart contracts can also interact with systems representing real-world assets.

Examples may include:

Securities
Real estate interests
Commodities
Invoices
Fund interests
Collectibles

But putting a representation of an asset on a blockchain does not automatically transfer the legal rights associated with the underlying asset.

The blockchain system, legal system, custodians, issuers, and other infrastructure all matter.

This is why asset tokenization is related to smart contracts but is a distinct topic.

Advantages of Smart Contracts

Smart contracts can provide several potential advantages.

Automation

Rules can execute automatically.

Transparency

Depending on the blockchain and application, contract code and transactions may be publicly inspectable.

Programmability

Developers can create complex application logic.

Composability

Contracts can interact with other blockchain components.

Availability

Public blockchain applications can potentially operate without relying on a single central server.

Reduced Intermediary Dependence

Some processes can be automated without requiring a traditional intermediary to execute every step.

Global Accessibility

Permissionless blockchain applications can potentially be accessed by users around the world, subject to the application's design and applicable laws.

Limitations of Smart Contracts

Smart contracts are not a magic replacement for every traditional system.

Code Is Not Perfect

A bug can become a serious vulnerability.

Execution Costs Money

Blockchain computation requires network resources.

External Data Is Difficult

Contracts need oracle systems to interact reliably with the outside world.

Privacy Can Be Limited

Public blockchains can expose transaction information.

Transactions May Be Difficult to Reverse

This is useful for finality but dangerous when mistakes occur.

Legal Recognition Varies

Blockchain execution does not automatically determine legal ownership or contractual rights.

Security Is Critical

A vulnerability can potentially result in significant losses.

Smart Contracts vs Traditional Contracts

Feature	Traditional Contract	Smart Contract
Form	Legal/documentary agreement	Computer program
Execution	People or institutions	Blockchain software
Automation	Usually limited	Core capability
Human interpretation	Often required	Code executes defined rules
Legal enforcement	Courts/law	Depends on legal context
Modification	Usually possible through agreement	Depends on design
Transparency	Usually private	Can be publicly inspectable
Blockchain required	No	Yes
Programming required	Not necessarily	Yes

The two can also work together.

A business could use a legal agreement to establish rights while using smart-contract software to automate selected operational processes.

Smart Contract vs Blockchain

These terms are not interchangeable.

Blockchain

The underlying distributed ledger and network infrastructure.

Smart Contract

A program that runs within a compatible blockchain environment.

A useful analogy is:

Blockchain = computing platform

Smart contract = program running on the platform

A blockchain can exist without sophisticated smart contracts.

But programmable blockchains can host many smart contracts.

Smart Contract vs dApp

They are also different.

Smart Contract

The blockchain-based program containing application logic.

dApp

The broader application that may include:

Frontend
Wallet integration
Smart contracts
Blockchain infrastructure
APIs
Data services
Other components

A dApp may therefore contain one smart contract or many.

What Is a DAO?

A DAO, or decentralized autonomous organization, is an organization or governance system that uses blockchain-based mechanisms to coordinate participants.

Smart contracts can implement parts of the DAO's:

Voting
Treasury management
Membership
Proposal system
Governance rules

For example:

Proposal
   ↓
Voting
   ↓
Quorum reached
   ↓
Vote succeeds
   ↓
Smart contract executes approved action

The actual governance design can be much more complicated.

Can You Build a Smart Contract?

Yes.

A beginner can start by learning the fundamentals before attempting to deploy anything involving real money.

A sensible progression is:

Level 1 — Blockchain Fundamentals

Learn:

Blocks
Transactions
Wallets
Keys
Consensus
Blockchain state

Level 2 — Programming

Learn:

Variables
Functions
Conditions
Loops
Data structures
Error handling

Level 3 — Smart Contracts

Learn:

Contract structure
Functions
Events
Storage
Permissions
Transactions
Gas

Level 4 — Testing

Learn:

Unit testing
Integration testing
Fuzz testing
Security analysis

Level 5 — dApp Development

Learn:

Frontend development
Wallet integration
Contract interaction
APIs
Blockchain data

Level 6 — Security

Learn:

Common vulnerabilities
Auditing
Threat modeling
Access control
Economic attacks

Level 7 — Production

Learn:

Deployment
Monitoring
Upgrades
Governance
Incident response

Do not start by putting significant real funds into an experimental contract.

What Can You Build With Smart Contracts?

You can build:

Token systems
Decentralized exchanges
Lending applications
Membership systems
Voting systems
DAO infrastructure
Digital marketplaces
Blockchain games
Digital collectibles
Escrow systems
Payment systems
Fundraising applications
Identity systems
Certification systems
Supply-chain applications
Tokenized-asset infrastructure

The strongest applications are usually those where blockchain-based programmability solves a real problem.

BUILD & MONETIZE

Smart contracts create opportunities for developers, entrepreneurs, educators, and businesses.

You do not need to create a new cryptocurrency to build a business around blockchain.

Build dApps

Create decentralized applications that solve specific problems.

Examples:

Membership platform

Digital marketplace

Creator-reward system

Decentralized voting platform

Blockchain-based certification system

Build Smart-Contract Tools

Create tools for:

Contract testing
Monitoring
Analytics
Security
Deployment
Wallet management
Transaction tracking
Contract verification

Developer infrastructure can be valuable because blockchain applications require specialized tooling.

Offer Smart-Contract Development

Businesses and Web3 projects may need developers who can:

Design contracts
Write code
Test contracts
Deploy applications
Integrate wallets
Connect frontends
Monitor systems

Security competence is particularly important.

Build Security Services

Smart-contract security creates opportunities in:

Auditing
Code review
Vulnerability research
Monitoring
Incident response
Security tooling

Because blockchain transactions can be difficult to reverse, security can be a critical part of the product.

Create Blockchain Education

You can turn knowledge into:

Courses
Ebooks
Tutorials
Developer guides
Project-based learning
Cheat sheets
Templates
Workshops

A beginner-friendly smart-contract education product can help people move from blockchain concepts to practical development.

Build Business Automation

Smart contracts can potentially automate selected business processes involving:

Payments
Escrow
Digital rights
Membership
Verification
Rewards
Settlement

The strongest opportunity is usually not "blockchain because blockchain."

It is:

Real problem → programmable rules → measurable value

The Future of Smart Contracts

Smart contracts are moving beyond the early idea of simple blockchain automation.

The broader ecosystem is evolving toward:

More scalability

Better user experience

More interoperability

More sophisticated wallets

Stronger security

More specialized Layer 2 networks

Greater integration with traditional systems

Ethereum's 2026 roadmap includes continued scaling work and planned protocol improvements, while current Layer 2 development emphasizes different forms of specialization and customization.

At the same time, security remains a major challenge. Ethereum's 2026 security initiative specifically highlights smart-contract security, infrastructure, user experience, and related areas as obstacles that need continued attention.

The likely direction is therefore not simply:

"More smart contracts."

It is:

More useful, secure, scalable, interoperable programmable systems.

Frequently Asked Questions

What is a smart contract in simple terms?

A smart contract is a blockchain program that automatically performs programmed actions when specified conditions are met.

Is a smart contract really a contract?

Not necessarily. A smart contract is software. Whether it also constitutes a legally enforceable contract depends on the circumstances and applicable law.

What is an example of a smart contract?

A program that automatically transfers a digital asset when a specified payment is received is a simple example.

Do smart contracts use AI?

They do not require AI. Smart contracts are blockchain programs. AI can be integrated into applications that interact with smart contracts.

What programming language is used for smart contracts?

Solidity is widely used for Ethereum and EVM-compatible networks. Other blockchain ecosystems use languages such as Rust, Vyper, and Move.

Can smart contracts be hacked?

Smart contracts can contain vulnerabilities that attackers exploit. This is why testing, auditing, secure development, and monitoring are essential.

Can smart contracts be changed after deployment?

Some are designed to be immutable, while others use upgrade mechanisms. The contract architecture determines what can be changed and who can authorize changes.

Do smart contracts need the Internet?

Blockchain networks require network connectivity among their participants, but an individual smart contract does not directly access the public Internet like a normal web application. External information usually reaches it through oracle systems.

What is the difference between a smart contract and a dApp?

A smart contract is blockchain-based program logic. A dApp is the broader application that may use smart contracts together with a frontend, wallet, APIs, and other components.

Are smart contracts safe?

They can be designed securely, but they are not automatically safe. Code vulnerabilities, oracle failures, economic attacks, compromised infrastructure, and poor governance can create risks.

Can beginners learn smart-contract development?

Yes. Beginners should first learn blockchain and programming fundamentals, then move into contract development, testing, security, and dApp development.

FINAL TAKEAWAY

A smart contract is a blockchain program that automatically executes predefined rules.

Remember the basic progression:

BLOCKCHAIN → PROVIDES THE ENVIRONMENT

SMART CONTRACT → PROVIDES THE PROGRAMMABLE RULES

TRANSACTION → TRIGGERS EXECUTION

CODE → DETERMINES WHAT HAPPENS

BLOCKCHAIN → RECORDS THE RESULT

The bigger idea is:

Traditional software automates processes on computers.

Smart contracts automate programmable processes on blockchains.

That makes smart contracts one of the foundational technologies behind the programmable side of Web3.

And as blockchain infrastructure becomes more scalable, interoperable, and user-friendly, smart contracts can become less visible to ordinary users while becoming more deeply embedded in the applications they use.

Master Knowledge Architecture: Blockchain, Web3 & Decentralized Technology → Smart Contracts

Next category: Digital Business & Entrepreneurship.

Image: Kaspersky.

Pages

Saturday, September 12, 2026

WHAT IS A SMART CONTRACT? | How Blockchain Programs Work, Examples, Benefits, and Risks

QUICK ANSWER

Why Is It Called a Smart Contract?

How Does a Smart Contract Work?

What Is the "IF/THEN" Principle?

Where Do Smart Contracts Live?

What Makes Smart Contracts Different From Normal Software?

What Is Blockchain State?

What Is a Smart Contract Transaction?

What Is Gas?

Why Can't a Smart Contract Simply Do Anything?

What Is a Blockchain Oracle?

What Can Smart Contracts Do?

1. Token Systems

2. Decentralized Finance

3. Decentralized Applications

4. Digital Ownership

5. Governance

6. Blockchain Games

7. Escrow

What Is a dApp?

What Is Smart-Contract Composability?

Are Smart Contracts Actually Contracts?

Can Smart Contracts Be Changed?

More immutability

More upgradeability

What Is Smart-Contract Security?

Common Smart-Contract Risks

1. Coding Bugs

2. Reentrancy

3. Access-Control Errors

4. Arithmetic Problems

5. Oracle Manipulation

6. Economic Attacks

7. Upgrade Risks

8. Dependency Risks

How Are Smart Contracts Tested?

What Programming Languages Are Used?

What Is an EVM?

What Is Layer 2 and Why Does It Matter for Smart Contracts?

Smart Contracts and Scaling

What Is Account Abstraction?

Smart Contracts and Artificial Intelligence

Smart Contracts and Real-World Assets

Advantages of Smart Contracts

Automation

Transparency

Programmability

Composability

Availability

Reduced Intermediary Dependence

Global Accessibility

Limitations of Smart Contracts

Code Is Not Perfect

Execution Costs Money

External Data Is Difficult

Privacy Can Be Limited

Transactions May Be Difficult to Reverse

Legal Recognition Varies

Security Is Critical

Smart Contracts vs Traditional Contracts

Smart Contract vs Blockchain

Blockchain

Smart Contract

Smart Contract vs dApp

Smart Contract

dApp

What Is a DAO?

Can You Build a Smart Contract?

Level 1 — Blockchain Fundamentals

Level 2 — Programming

Level 3 — Smart Contracts

Level 4 — Testing

Level 5 — dApp Development

Level 6 — Security

Level 7 — Production

What Can You Build With Smart Contracts?

BUILD & MONETIZE