What is Ethereum?

Ethereum and ETH Are Not the Same Thing

Ethereum is an open blockchain network where smart contracts run. ETH or ether is the native asset of this network. In everyday language, when people say “I bought Ethereum,” they usually mean they purchased ETH. Distinguishing between the network and the asset is the first step in understanding how transaction fees and applications work.

On Ethereum, a developer can create tokens, exchange applications, games, or voting systems. None of these applications are Ethereum itself. The fact that an application runs on Ethereum does not imply that Ethereum developers have approved it or guaranteed the deposited funds. The code, permissions, and economic design of each contract must be examined individually.

What Does a Smart Contract Provide?

A smart contract is an on-chain program that operates based on specific conditions. For example, an exchange contract can take a specific amount of tokens and provide other tokens within the limits you accept. A lending application can record your collateral, calculate your debt, and initiate a liquidation process if conditions are breached.

These programs do not interpret things like humans; they execute written rules. If there is a bug in the code, unintended consequences can occur automatically as well. The term “decentralized application” does not prove that the interface, data source, or administrative powers are fully decentralized. A contract might depend on external price data or an update key held by a small group.

Contract code is executed according to the rules of the Ethereum Virtual Machine (EVM). Computers on the network must produce the same result from the same transactions. This common computational framework allows applications to interact with each other; one application can call the function of another contract.

What is ETH Used For?

Fees for transactions on the Ethereum mainnet are paid in ETH. Sending ETH, transferring tokens, moving NFTs, or calling contracts all consume processing resources. Having other tokens in your wallet does not mean you have enough ETH for the fee. Therefore, the reason for the “I have tokens but I can’t send them” issue is often a lack of ETH.

ETH is also used as collateral in the network’s Proof of Stake security mechanism. Validators can earn rewards for participating in their duties or face penalties for specific violations. It can also be used as collateral or a trading asset in DeFi applications. The risks of these use cases differ; holding ETH is not the same as depositing it into a lending protocol.

How to Think About Gas Fees

Gas is the measure of the computational resource a transaction uses. The fee to be paid is based on the relationship between the amount of gas used and the unit gas price. The gas requirement for a simple ETH transfer and a complex swap may not be the same. When network demand increases, the unit price can also rise.

In a hypothetical example, a transaction uses 21,000 gas and the total unit price is 10 gwei. One gwei is one-billionth of an ETH. The fee would be 21,000 × 10 gwei, which is 0.00021 ETH. When the price of ETH changes, the TL equivalent of this fee changes. The assumption of 21,000 gas should not be used for complex contract transactions.

A failed transaction may have also consumed computation and incurred a fee. It should not be assumed that the fee will automatically be refunded just because the swap did not occur. Read the estimated fee and the expected asset change in the wallet’s preview separately. Permission to spend tokens and the swap transaction may require two separate approvals and fees.

Proof of Stake and Staking

Ethereum has used Proof of Stake for its mainnet consensus since the Merge transition in 2022. Unlike Bitcoin, there is no mining race to produce new blocks. Validators deposit ETH collateral and participate in proposing blocks and sending validation messages.

There are different ways to stake: you can run a validator yourself, use an infrastructure service, or join pools. Pool and liquid staking products can provide access with smaller amounts but introduce additional risks related to contracts, service providers, and representative tokens. The yield rate is not fixed.

Even if your ETH count increases, you can still experience a loss in TL terms due to a price drop. Additionally, exit queues, service fees, or validator penalties can affect the outcome. Therefore, it is not accurate to view staking as a fixed-interest product like a bank deposit. It should be understood who holds the keys and withdrawal authority for the chosen method.

Ethereum Tokens and Network Selection

ERC-20 is a common transaction interface for fungible tokens. ERC-721 is used for unique NFTs. Standards facilitate the compatibility of wallets and applications; they do not determine the value or reliability of the asset. Different contracts can be created using the same symbol.

To identify a token, verify the contract address on the correct network from an official source. The first asset with the same name that appears in search results may not be the correct token. When depositing to an exchange, check that the network and the token are supported. The fact that the address format is compatible does not guarantee that the platform will credit the transfer to your account.

Why is Layer 2 Used?

Layer 2 networks aim to use Ethereum’s limited mainnet space more efficiently by processing transactions on a different execution layer. In rollup designs, transaction data or validation proofs are linked to the mainnet. Users can experience lower fees and faster transaction speeds.

However, mainnet and Layer 2 balances are separate. A bridge transfer or a direct withdrawal from an exchange that supports the relevant network may be required. Seeing the same wallet address does not mean that ETH on all networks is automatically a shared balance. Additionally, official bridge exit times, sequencer outages, and management permissions vary from network to network.

Which Risks Should Be Distinguished When Using Ethereum?

The security of the network, the security of the contract you use, and your own wallet security are three separate layers. While the network is functioning correctly, you could lose tokens by authorizing a fake site. Even if you protect your wallet well, assets you deposit into a flawed protocol may be compromised. The price of ETH can also drop while all systems are working perfectly.

At the start, it is useful to learn how to select the right network, follow a small transfer, and understand signing requests in the wallet. Recovery words are never shared in any support process. If you cannot explain what an application does, approving the transaction just because it runs on a well-known network is not sufficient justification.

Sources

• Ethereum: Introduction to the Network
• Ethereum: Gas and Fees
• Ethereum: Staking Methods
• Ethereum: Layer 2 Networks