Smart Contracts: Everything About Web3 Contracts

Smart contracts are programs stored on a blockchain and run when certain conditions are met.

Smart contracts are typically used to automate an agreement’s execution so all parties can know the outcome immediately without any intermediary or loss of time.

They can automate a workflow and trigger the next action if conditions are met.

Without the need for a centralized authority, a legal system, or an external enforcement mechanism, smart contracts enable trusted transactions and agreements to be made between dispersed, anonymous parties.

Smart contracts define the parameters of an agreement or deal, just like any other contract.

But what makes them “smart” is that the terms are decided upon and carried out as code running on a blockchain instead of on paper on a lawyer’s desk.

Smart contracts are built on the fundamental concept of Bitcoin: to send and receive money without an “intermediary,” like a bank in the middle, to enable the decentralized automation of nearly any agreement or transaction, regardless of how complex it is it may be.

Additionally, they provide security, dependability, and accessibility without boundaries because they are built on a blockchain like Ethereum.

How Do Smart Contracts Work?

How Smart Contracts Work

Let’s say Abhishek wants to purchase Devansh’s home. Using a smart contract, this agreement is created on the Ethereum blockchain.

Abhishek and Devansh have an agreement in this smart contract. The agreement reads: “Abhishek Will Receive Ownership Of The House When Abhishek Pays Devansh 300 Ether.”

It is safe for Abhishek to pay Devansh 300 Ether for the house since it cannot be modified once this smart contract agreement is established.

In this case, Devansh and Abhishek would have to pay any fees to other businesses if a smart contract hadn’t been used. Including the bank, an attorney, and a real estate agent.

Once the terms of the agreement are satisfied, smart contracts automatically carry out their provisions. This indicates that a third party, such as a bank, broker, or government, is not required.

Blockchain technology allows us to decentralize smart contracts, making them fair and trustworthy. Decentralizing refers to the fact that they are not governed by a single central party (like a bank, broker, government, etc.).

The blockchain is a shared database operated by numerous computers, or “nodes,” that belong to numerous persons.

As a result, it is not under the jurisdiction of any one person or entity. It is nearly impossible to hack; to attack the blockchain or the smart contracts that operate on it, a hacker would need to compromise more than 50% of the nodes.

Consequently, smart contracts can operate securely and automatically without being susceptible to modification! Having learned more about what a smart contract is today.

Smart contracts can automatically operate thanks to the blockchain’s security, doing away with the need for supervisory oversight.

All that is required is a computer program to identify an occasion that prompts execution (i.e., if X happens, run Y). Once a smart contract is entered, the programmed rules cannot be changed.

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Why Do We Need Smart Contracts?

A real estate transaction may make use of smart contracts. Once the buyer has given the seller the property’s full value, both the buyer and seller can form a smart contract that will automate the transaction.

The property needs to be digitized using blockchain technology for all of these things to happen. Once completed, both parties can use smart contracts to carry out their agreement.

This straightforward concept is sufficient to automate entire networks, such as decentralized autonomous organizations using smart contracts or individual jobs.

What Are The Benefits of Using Smart Contracts?

The key benefits of smart contracts include the following:


The automation that smart contracts provide is by far their biggest advantage. It simply means that there will be no interruptions and that a third party cannot change the decision and the agreement.

This automation can be quite helpful in helping businesses automate some of their operations. Additionally, it fixes problems with procedures where trust is a problem.


Smart contracts are incredible in part because of their security. It provides secure operation of processes.

Additionally, smart contracts function as intended because of encryption. Smart contracts cannot be updated or altered in any manner since they operate on networks with immutable data. All information is kept secure in this way.

Interruption Free

Smart contracts operate without hiccups. This indicates that they cannot be stopped or interrupted once they have begun to execute.


The entire system needs more credibility. This implies that trusting third parties is unnecessary. That seems counterintuitive. In plain English, it says there is no need to trust the parties to complete a transaction.

Trust is not a necessary component of a transaction or a trade. Since smart contracts operate on a decentralized network, the network as a whole is unreliable.


Transactions have become more economical thanks to smart contracts. By eliminating intermediaries from the process, this is accomplished. Doing this expedites the transactions, and the associated costs are also eliminated.

Fast Performance

Autonomous smart contracts execute far more quickly than the antiquated traditional method. All parameters are predefined in the smart contracts; thus, all that is required for it to begin executing is that they match.

Accurate and Error-Free

Finally, smart contracts are precise and error-free. The only problem is that they must be correctly coded to run without making any mistakes.

You could make mistakes when submitting your taxes, for instance. It will be a mistake-free method if you utilize a smart contract to handle it for you, though.

Who Created Smart Contracts, And When?

Nick Szabo, who created the phrase, first advocated smart contracts in the early 1990s, defining them as “a set of promises, stated in digital form, including protocols within which the parties fulfill these promises.”

The Stanford Infobus, a system part of the Stanford Digital Library Project, had a layer of rights management services that year. This layer’s objects were referred to as the “term” in that layer.

Key terms In Smart Contracts:

Agent: A real name or surname is typically used to identify a person or group. Additionally, software that represents an agent is run by a computer.

Contract: A group of commitments made between agents.

Parties (also known as Directors): Agents who have agreed to the disputed contract.

Protocol: A series of communications between various agents.

Smart contract: A collection of commitments, including guidelines for how each party will carry out the other commitments.

The protocols are often used in other digital gadgets or computer networks with programs. These contracts are, therefore, “smarter” than those they replaced.

Cryptographic protocol: A protocol that accomplishes the objectives of smart contracts using fundamental mathematical concepts.

Key: A random number is chosen from a namespace so big that a good guess is quite unlikely, creating a focal point of darkness and control.

Digital signature: Public key cryptography is the foundation of a cryptographic protocol that demonstrates that an item is actively “signed” with the private key, which corresponds to the private key being in active contact with the object.

Given that its purpose more closely resembles that of a digital mark or digital stamp than an autograph, those terms should have been used instead.

Pros And Cons Of Smart Contracts

Pros of Smart Contracts:

Autonomy and savings: Due to the lack of brokers or other intermediaries, smart contracts completely remove the possibility of third parties manipulating the agreement. Moreover, smart contracts save money because there are no middlemen involved.

Backup: Since every document on the blockchain is duplicated numerous times, originals may always be recovered in the event of data loss.

Safety: All the documents are protected against intrusion by cryptography, which is used in smart contracts.

Speed: Smart contracts use computer protocols to automate functions, cutting hours from various commercial processes.

Accuracy: Using smart contracts eliminates errors that arise from manually filling out several forms.

Cons of Smart Contracts:

Difficult to change: It is nearly impossible to change how a smart contract works, and fixing a code fault can be time-consuming and expensive.

Possibility of loopholes: The idea of good faith states that parties will deal fairly and refrain from obtaining unethical benefits from a contract.

However, it is challenging to guarantee that the terms follow what was agreed upon when using smart contracts.

Third-party: Even though smart contracts aim to do away with third parties, it is impossible. In contrast to their roles in conventional contracts, third parties take on new responsibilities.

For instance, attorneys won’t be required to draft individual contracts. However, developers will still need them to comprehend the conditions when writing the programs for smart contracts.

Vague terms: Smart contracts can’t always handle unclear terms and conditions since contracts often include terms that aren’t always clear.

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How To Create A Smart Contract?

Here are the steps toward creating a smart contract on MetaMask:

Step 1: Create a wallet at MetaMask

Install MetaMask and make it active in your Chrome browser. Click on its symbol in the top right corner of the browser page once it has been installed. It will open in a new tab of the browser when clicked.

To continue, click “Create Wallet” and “I agree” to confirm that you have read and understand the terms and conditions. You will be prompted to choose a password.

When you create a password, it will send you a secret backup phrase for backing up and restoring the account. Do not divulge it or give it to anyone, as doing so could cost you Ethers.

Step 2: Select any one test network

You might also find the following test networks in your MetaMask wallet:

  • Robsten Test Network
  • Kovan Test Network
  • Rinkeby Test Network
  • Goerli Test Network

Step 3: Add some dummy Ethers to your wallet

If you want to test the smart contract, you need to have some fake ethers in your MetaMask wallet. For instance, if you choose the Robsten test network to test a contract on, your account will initially have 0 ETH. The “Deposit” and “Get Ether” buttons under Test Faucet can add fictitious ethers.

Click “Request one ether from the faucet” to continue, and 1 ETH will be added to your wallet. The test network can accept as many others as you like.

You can begin creating smart contracts using the Solidity programming language on the Remix Browser IDE once the dummy ethers have been added to the wallet.

Step 4: Use editor remix to write the smart contract in Solidity

To write our Solidity code, we will use the Remix Browser IDE. The Remix has several features and provides a complete development experience, making it the best choice for creating smart contracts.

Typically, it is applied to the creation of shorter contracts. Features of Remix include checking for overlapping variable names, warnings about hazardous code, the ability to make functions constant, and more.

Syntax highlighting and error Static analysis, integrated testing, functions with inserted Web3 objects Directly deploy to MetaMask or Mist.

Step 5: Create a .sol extension file

Open Remix Browser and click on the plus icon on the top left side, next to the browser, to create a .sol extension file.

Step 6: A sample smart contract code to create ERC20 tokens

ERC20.sol is a standard template for ERC20 tokens.
Select a version of the compiler from Remix to compile the Solidity Ethereum smart contract code.

Step 7: Deploy your contract

Press the deploy button on the Remix window’s right side to deploy the smart contract to the Ethereum test network. Hold off until the transaction is finished.

The smart contract address will be revealed on the right side of the remix window after the transaction is committed properly. The user’s wallet deploying the smart contract will initially contain all ERC20 tokens.

Go to the Metamask window, select Add Tokens, enter the smart contract address, and then click OK to view the tokens in your wallet. The number of tokens would be seen there.

To learn how to create a smart contract in detail, check out this tutorial.

How Much Does It Cost To Create Smart Contracts?

Simple, smart contracts can easily cost more than USD 500 to deploy. Any significant application deployment on the Ethereum main net can soon surpass $10,000.

Should You Use Smart Contracts?

Yes. In many blockchain-related activities, smart contracts are a helpful innovation that benefits end users by reducing fees, accelerating transaction times, guaranteeing performance, and enhancing protections for cooperating parties.

How To Make Money With Smart Contracts?

Here are the ways to make money with Smart Contracts:

• Get a job as a Solidity developer

• Borrow or Lend and earn interest using smart contracts

• Create and sell smart contracts

• Create projects and sell them

• Start a smart contract-creating company

• Work as a Blockchain and Smart Contract Developer

Are Smart Contracts Legally Binding?

Digital contracts, known as “smart contracts,” are designed to conduct transactions between parties quickly, accurately, and with integrity. If smart contracts abide by contract law, they are enforceable in court.

How Much Does It Cost To Deploy A Smart Contract?

Budget upwards of $5000 only for deployment expenditures if you anticipate deploying even a moderately sized contract.

If you strive to make it small and compact, small contracts can get away with $500, but it’s unlikely you can get any lower than that.

What Language Are Smart Contracts Written In?

Generally, Smart Contracts are written in this programming languages:

1. Solidity
2. Rust
3. JavaScript
4. Vyper
5. Yul

Can A Smart Contract Be Changed?

In Ethereum, smart contracts are, by default, immutable. There is no way to change them once you’ve created them; therefore, they serve as an ironclad contract between participants.

How To Interact With A Smart Contract?

Here are the steps toward interacting with a smart contract:

Step 1: Create an interaction. js file
Step 2: Update your .env file
Step 3: Grab your contract ABI
Step 4: Create an instance of your contract
Step 5: Read the init message
Step 6: Update the message
Step 7: Read the new message

How To Read A Smart Contract?

Here are the steps toward reading a smart contract:

• Finding a smart contract

• Reading basic details such as creator address, token name, tokens held in the contract, and so on

• Understanding the statistics of a contract’s tokens and what they convey

• Searching and understanding the transactions that have happened through a smart contract.

• Finding the source code of a contract for deeper analysis

How To Enable Smart Contract Data On The Ledger?

Steps to enable smart contract data on the ledger are:

• Unlock your Ledger.
• Go to “Ethereum.”
• Go to “Settings.”
• Go to “Contract Data.”
• Select “Yes.”

How To Mint NFT From A Smart Contract?

Steps to mint from a smart contract are:

• Step 1: Find a smart contract address

• Step 2: Search Etherscan using the smart contract address

• Step 3: Connect to a Web3 network using MetaMask

• Step 4: Mint the NFT from the smart contract

Does Solana Have Smart Contracts?

Solana is a blockchain that performs well, develops quickly and scales well.

As a protocol, it encourages the creation of many smart contract types that enable dApps, such as P2P lending platforms, NFT marketplaces, Wallets, and many more.

Does Algorand Have Smart Contracts?

Yes. With the help of Algorand’s smart contracts, programmers can create decentralized applications (dApps) that are extremely scalable, safe, and inexpensive to run.

Smart contracts are simple lines of code recorded on a blockchain and automatically run when specific circumstances are satisfied.

How Much Does A Smart Contract Developer Make?

A senior smart contract developer can earn between $120k and $200k per year, with many employers giving remuneration in cryptocurrency.

Entry-level smart contract engineers can earn between $100k and $130k per year.

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