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What is a Smart Contract and How it Works on a Blockchain?

Learn everything about smart contracts and their role in blockchain operations. Explore the transformative impact of automated agreements.
Marcus K
6 Minutes
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In today's digital age, contracts are integral to our professional and personal lives. They regulate various aspects of our interactions and are essential for the functioning of modern society. With the advent of blockchain technology, a new concept called smart contracts has emerged. 

Smart contracts are computer programs or protocols that automate transactions and are stored on a blockchain. 

They revolutionize how agreements are executed, making them more secure, efficient, and transparent. This article will explore smart contracts, their work, and their importance.

Understanding Smart Contracts

Smart contracts can be defined as computer programs or protocols that automate transactions based on predefined conditions. These conditions are inscribed directly into lines of code, making the contract self-executing and immutable. 

Unlike traditional contracts that require intermediaries to enforce their terms, smart contracts eliminate the need for intermediaries, ensuring faster and more secure transactions.

Example of a Smart Contract

Let's consider a real-life scenario to understand the concept of smart contracts. Imagine John is a freelance graphic designer who works remotely for various clients. 

He has a contract with a payment platform that utilizes blockchain technology. The platform uses smart contracts to ensure secure and transparent transactions. The smart contract is linked to a database that records the completion of design projects. 

The contract is created based on the agreed terms and conditions, including timely design work delivery. The smart contract holds the client's funds until the work is completed and approved. 

Once John submits the design and it is approved, the smart contract self-executes, and John is automatically paid. This process eliminates the need for intermediaries, reduces payment delays, and provides a tamper-proof payment solution.

How do Smart Contracts Work?

Now that we understand the benefits of smart contracts, let's delve into how they actually work. Smart contracts operate on a dedicated virtual machine embedded in a blockchain or other distributed ledger. The process of creating and deploying a smart contract involves several steps:

1. Defining the Desired Behavior - Business teams collaborate with developers to define the desired behavior of the smart contract. They specify the conditions and events that should trigger the execution of the contract.

2. Specifying Conditions - Conditions within the smart contract must be met to execute the contract. These conditions can range from simple events, such as payment authorization, to more complex operations, such as determining the value of a financial instrument.

3. Writing the Code - Developers write the code for the smart contract based on the defined conditions. They use a smart contract writing platform to create and test the logic. Security testing is also performed to ensure the contract's integrity.

4. Deployment on the Blockchain - Once the code is written and tested, the smart contract is deployed on a blockchain or other distributed ledger infrastructure. This involves validating the contract's validity and uploading the code to the network.

5. Triggering Contract Execution - The smart contract is configured to listen for updates from an "oracle," which is a secure data source. Once the necessary combination of events is received, the smart contract executes and performs the specified actions.

6. Recording Contract Details - The executed smart contract's details, including the terms, conditions, and execution date, are recorded on the blockchain ledger. This information is immutable and cannot be changed or removed.

Benefits of Smart Contracts

Smart contracts offer several benefits compared to traditional contracts. Let's explore some of the key advantages:

1. Accuracy, Speed, and Efficiency

Smart contracts eliminate the need for paperwork and manual processing, leading to faster and more efficient transactions. They automate the execution of agreements, reducing the time spent on correcting errors that can occur when filling out documentation by hand.

2. Trust and Transparency

Smart contracts ensure trust and transparency in transactions. Since they are stored on a blockchain, all participants can access the contract's contents and verify its execution. Information cannot be tampered with for personal gain, as a third party is not involved.

3. Security

Blockchain technology ensures the security of smart contracts. Transaction records on the blockchain are encrypted and extremely difficult to hack.

Additionally, each entry on a distributed ledger is linked to the entries before and after it, making it nearly impossible for a hacker to change a single record without altering the entire chain.

4. Cost Savings

Smart contracts eliminate the need for intermediaries in transactions, such as brokers or banks, resulting in cost savings. There are no time delays or fees associated with intermediaries, making transactions more efficient and affordable.

Use Cases of Smart Contracts

Smart contracts have numerous use cases across various industries. Let's explore some of the most prominent examples:

1. Supply Chain Management

Smart contracts can automate and streamline supply chain processes. They can track product custody, verify authenticity, and automate payments based on predefined conditions. This reduces the need for intermediaries and increases efficiency and transparency in supply chain operations.

2. Insurance

Smart contracts can revolutionize the insurance industry by automating claims processing and payouts. They can automatically verify claim eligibility, assess damages, and release payments without the need for manual intervention.

3. Digital Identity

Smart contracts can be used to create decentralized digital identity systems. Individuals can control their personal data and choose what information to share with different entities. This enhances privacy and security and reduces the risk of identity theft.

4. Voting Systems

Blockchain-based smart contracts can revolutionize voting systems by ensuring transparency and security and eliminating the possibility of fraud. Each vote is recorded on the blockchain, and the counting process is automated, eliminating the need for manual counting and potential human errors.

Limitations of Smart Contracts

While smart contracts offer numerous benefits, they are not without limitations. Some of the key limitations include:

1. Inability to Access External Data

Smart contracts cannot directly access external data sources, which can limit their functionality in certain use cases. Oracles, which are third-party services, are often used to bridge this gap and provide the necessary data to smart contracts.

2. Lack of Regulatory Clarity

The legal and regulatory frameworks surrounding smart contracts are still evolving. Issues such as taxation, government oversight, and dispute resolution need to be addressed to ensure the widespread adoption of smart contracts.

3. Scalability and Network Congestion

As blockchain networks and smart contract usage grow, scalability and network congestion can become challenges. High usage periods can impact the performance and reliability of the system, requiring continuous improvements to handle increasing transaction volumes.

Conclusion

Smart contracts are revolutionizing how agreements are executed, making transactions faster, more secure, and transparent. By automating the execution of agreements, smart contracts eliminate the need for intermediaries and reduce costs. 

They offer numerous benefits, including accuracy, speed, trust, transparency, and security. While smart contracts have limitations, their potential to transform various industries is immense. 

As blockchain technology evolves, smart contracts will play a crucial role in shaping the digital world's future of transactions and interactions.

Disclaimer

The information provided on this website does not constitute investment advice, financial advice, trading advice, or any other advice, and you should not treat any of the website's content as such.

Token Metrics does not recommend buying, selling, or holding any cryptocurrency. Conduct your due diligence and consult your financial advisor before making investment decisions.

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Token Metrics: AI-powered crypto research and ratings platform. We help investors make smarter decisions with unbiased Token Metrics Ratings, on-chain analytics, and editor-curated “Top 10” guides. Our platform distills thousands of data points into clear scores, trends, and alerts you can act on.
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What You’ll Build in 2 Minutes

A minimal script to fetch Fundamental Grade from /v2/fundamental-grade for any symbol (e.g., BTC).

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Endpoints to consider next:

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Why This Matters

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Token Metrics provides real-time prices, trading signals, and on-chain insights all from one powerful API. Grab a Free API Key

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→ Join the waitlist to be first to trade TM Global 100.

Why Indices Matter in October 2025

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Definition

A crypto index is a rules-based basket of digital assets that’s constructed, weighted, and rebalanced on a set schedule.

How the TM Global 100 Index Works (Plain English)

  • Regime switching: Bullish: Hold the top-100 crypto assets by market cap.
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  • Weekly rebalancing: Reflects updated rankings and weights across the market-cap universe.
  • Transparency: Strategy modal shows methodology and thresholds; Gauge → Holdings Treemap → Transactions Log make every change visible.

What you’ll see on launch: Price tile, gauge (“rebalances weekly”), 100 tokens, one-click Buy Index flow, and a 90-second checkout via embedded wallet.‍See the strategy and rules.

Benefits at a Glance (Why This Beats DIY)

  • Time saved: No more manual coin-picking, sizing, and calendar rebalances.
  • Lower execution drag: One click vs. dozens of individual orders that can add slippage.
  • Stay current: Weekly rebalances help you capture market-cap changes without constant monitoring.
  • Discipline in drawdowns: Automatic switch to stablecoins removes panic decisions.
  • Radical visibility: Holdings treemap, table, and transactions log show what you own and what changed—every week.
  • Operational simplicity: Embedded wallet and a unified dashboard; no juggling chains and exchanges.

Step-by-Step: How to Get Early Access (Waitlist)

  1. Open the Indices Hub: Head to the Token Metrics Indices hub.
  2. Choose TM Global 100: Open the index page and review the Gauge → Strategy → Holdings.
  3. Join the Waitlist: Add your email to be notified the moment trading opens.
  4. (Optional) Connect Wallet: Pre-connect your wallet for a faster launch-day checkout.

Launch-Day Flow (~90 seconds): Tap Buy Index, review fees/slippage, confirm, and see your position in My Indices. Track Rebalances: After each weekly rebalance or regime change, check the Transactions Log for updates.

→ Join the waitlist to be first to trade TM Global 100.

Decision Guide: Is This Right for You?

  • Hands-Off Allocator: Want broad exposure without micromanaging? Yes—rules-based + weekly rebalances.
  • Active Trader: Need a core that sits in stables during bears while you hunt edges elsewhere? Fits.
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  • Data-First Analyst: Want to verify? See the holdings, weights, and transaction history anytime.

FAQs

1) What is a TM Global 100 index?

It’s a rules-based crypto index that holds the top 100 assets by market cap in bullish regimes and moves to stablecoins in bearish regimes. It rebalances weekly and shows transparent holdings and transactions.

2) How often does the index rebalance?

Weekly, with additional full-portfolio switches when the market regime changes.

3) What triggers the move to stablecoins?

A proprietary market signal. When bearish, the index exits all token positions into stablecoins and waits for a bullish re-entry signal.

4) Can I fund with USDC or fiat?

At launch, funding and settlement options surface based on the embedded wallet and supported chains. USDC payouts are supported for selling; additional entry options may be introduced later.

5) Is the wallet custodial?

No. The Embedded Wallet is self-custodial—you control your funds while using a streamlined, on-chain checkout.

6) How are fees shown?

Before you confirm, the Buy flow shows estimated gas, platform fee, maximum slippage, and the minimum expected value.

7) How do I join the waitlist?

Go to the Token Metrics Indices hub or the TM Global 100 strategy page and submit your email. We’ll notify you the moment trading opens.

Security, Risk & Transparency

  • Self-custody: Embedded smart wallet; you hold the keys.
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  • Fee clarity: Gas, platform fee, and slippage are displayed before you confirm.
  • Auditability: Holdings, treemap, and transactions log are always visible.
  • Model limits: Regime logic can be wrong, and markets can gap; rules reduce discretion—not risk.
  • Regional availability: Product surfaces may vary by region as we expand.

Crypto is volatile and can lose value. Past performance is not indicative of future results. This article is for research/education, not financial advice.

Conclusion

If you want a disciplined, rules-based core that adapts to market regimes, Token Metrics Global 100 is built for you. Weekly rebalances, transparent holdings, and one-click buy remove operational friction so you can focus on your strategy.

→ Click here to get early access to Token Metrics indices.

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If you want broad exposure to cryptocurrencies without constant chart monitoring, a top crypto index offers a streamlined way to participate in the market. Token Metrics provides innovative tools to help you understand and access such indices efficiently.

Opening Hook

If you’re seeking an uncomplicated, rules-driven approach to crypto investing that adapts to market conditions, a top crypto index might be worth exploring. These indexes automate the process of capturing upside potential while managing risk during downturns, making crypto investing more accessible for a variety of investor profiles.

What is a Crypto Index?

A crypto index is a systematic, rules-based collection of digital assets that reflects a specific universe—such as the top 100 cryptocurrencies by market capitalization. It relies on transparent methodologies and scheduled rebalancing to ensure that the composition remains aligned with market dynamics. These indexes aim to provide broad exposure while reducing the need for individual asset management.

How Top Crypto Indexes Function in 2025

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Benefits of Using a Crypto Index Over DIY Approaches

  • Time efficiency: Automates rebalancing and regime switching, saving manual effort.
  • Lower slippage: Executes large baskets with minimal impact on prices.
  • Consistency: Ensures regular rebalancing and discipline during volatile periods.
  • Transparency: Clear logs and dashboards allow for full accountability.
  • Speed: Simplified onboarding with quick allocation processes.

Getting Early Access to Top Crypto Indexes

To gain early exposure, follow these steps:

  1. Open the Token Metrics Indices hub.
  2. Select TM Global 100 and view its details.
  3. Tap “Join Waitlist” and enter your email (optionally connect your wallet).
  4. Review strategy criteria, holdings, and rebalancing rules.
  5. Once launched, connect your wallet, review estimated fees, and confirm your allocation.
  6. Funds appear in your index portfolio, enabling easy tracking and management.

Is This Index Suitable for You?

Consider your investment style:

  • Hands-Off Allocator: Ideal if you prefer broad market exposure with minimal management.
  • Active Trader: Use as a core component, complemented by higher-beta bets.
  • New to Crypto: Great for beginners seeking transparent exposure through simplified flows.
  • DIY Enthusiast: Replace complex basket-building with a rules-based index.
  • Self-Custody User: Benefit from integrated self-custodial wallets with clear transaction records.

FAQs

What is a top crypto index?

It is a rules-based basket that tracks a defined universe of digital assets—such as the top 100 by market cap—using transparent methodology and scheduled rebalancing.

How often does the index rebalance?

The index rebalances weekly, with regime switches occurring when market signals change, ensuring adaptability during different market cycles.

What prompts the move to stablecoins?

A proprietary market-regime signal triggers the transition, exiting token positions to stablecoins during bearish periods and re-entering when signals turn bullish.

Can I fund with USDC or fiat?

At launch, the embedded wallet will support supported funding options based on your chain or wallet. USDC payout is available upon sale; further options may follow.

Is the wallet custodial?

No. It’s an embedded, self-custodial smart wallet—giving you full control over your private keys and funds.

How are fees shown?

Estimated gas, platform fee, slippage, and minimum expected value are displayed before you confirm the transaction, providing full transparency.

How do I join the waitlist?

Visit the Token Metrics Indices hub or the TM Global 100 page, tap “Join Waitlist,” and follow the instructions to register your interest and prepare for launch.

Disclaimer

Crypto assets are highly volatile and can result in significant losses. Past performance does not guarantee future results. This content is for research and educational purposes only and not financial advice.

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