How to Use a Blockchain Explorer: Querying On-Chain Transactions

A blockchain explorer is your window into on-chain data and an essential tool for every cryptocurrency user. Different blockchains have their own explorers, but the core functions and operating logic are broadly the same. This guide covers how to use explorers across all major blockchains.

Part 1: Blockchain Explorer Overview

1.1 What Is a Blockchain Explorer?

A blockchain explorer (or block explorer) is a tool that translates raw on-chain data into a human-readable interface. It can display:

• Block information: Block number, timestamp, number of included transactions.
• Transaction information: Sender, recipient, amount, status.
• Address information: Balance, transaction history, token holdings.
• Contract information: Source code, ABI, interaction history.
• Token information: Supply, holders, trading volume.

1.2 Universal Functions of Blockchain Explorers

Regardless of which chain's explorer you are using, the following core features are typically available:

Function	Action	Purpose
Search transaction	Enter TxHash	View transaction status and details
Search address	Enter wallet address	View balance and transaction history
Search block	Enter block number	View block contents
Search token	Enter token name or contract	View token information
View contract	Open contract page	Verify contract code
Gas tracker	Gas Tracker page	Check current network fees

Part 2: EVM Chain Explorers

EVM-compatible chain explorers are highly uniform in interface and functionality, with most developed by the Etherscan team.

2.1 Ethereum — Etherscan

URL: etherscan.io

Standout features:

• ENS domain resolution (search for vitalik.eth, etc.)
• Gas Tracker (real-time gas prices and trends)
• Token Approval Checker (manage token spending allowances)
• Beacon Chain data (validator and staking information)
• Blob data viewer (EIP-4844 related)

Ethereum testnet explorers:

• Sepolia: sepolia.etherscan.io
• Holesky: holesky.etherscan.io

2.2 BNB Smart Chain — BscScan

URL: bscscan.com

Standout features:

• BSC validator information
• BEP-20 token tracking
• Very low gas fees (typically 3 to 5 Gwei)

2.3 Polygon — PolygonScan

URL: polygonscan.com

Standout features:

• Polygon PoS chain data
• MATIC (POL) token tracking
• Cross-chain bridge transaction tracking

2.4 Arbitrum — Arbiscan

URL: arbiscan.io

Standout features:

• L1-to-L2 message tracking
• Arbitrum-specific transaction types
• L2 fee analysis

2.5 Optimism — Optimistic Etherscan

URL: optimistic.etherscan.io

Standout features:

• L1 data availability information
• OP Stack-specific data

2.6 Base — BaseScan

URL: basescan.org

2.7 Avalanche — Snowscan

URL: snowscan.xyz

Standout features:

• C-Chain (smart contract chain) data
• Subnet information

2.8 General EVM Explorer Operations

Because these explorers share essentially the same interface, learning one means you can use all of them.

Querying a transaction:

1. Paste the Transaction Hash into the search bar.
2. Review the transaction details:
   • Status: Success or Failed
   • From / To: Participating addresses
   • Value: Transfer amount
   • Gas Fee: Transaction cost
   • Input Data: Contract call data

Querying an address:

1. Paste the address into the search bar.
2. View:
   • Balance (native token and all tokens)
   • Transaction history (multiple tabs)
   • Contract information (if the address is a contract)

Viewing a contract:

1. Open the contract address page.
2. Switch to the "Contract" tab.
3. If verified, you can view the source code.
4. "Read Contract": Call read-only functions.
5. "Write Contract": Interact with the contract (requires wallet connection).

Part 3: Non-EVM Chain Explorers

3.1 Solana — Solscan / Solana Explorer

Solscan: solscan.io Official Explorer: explorer.solana.com

What makes Solana explorers different:

• Transactions are identified by a Signature rather than a TxHash.
• Addresses are Base58-encoded public keys.
• The account model differs from EVM chains.

Core features:

• Transaction detail viewing
• Address balance and SPL token tracking
• Program viewing (the Solana equivalent of a smart contract)
• NFT information and metadata
• Validator and staking information

Querying a Solana transaction:

1. Paste the Transaction Signature into the Solscan search bar.
2. View the transaction status and involved accounts.
3. Check Token Balance Changes.
4. Check SOL Balance Changes.

Solana-specific terminology:

• Slot: Analogous to a block number.
• Program: The smart contract program that was executed.
• Inner Instructions: Internal instructions (similar to internal transactions on EVM chains).

3.2 Bitcoin — Mempool.space / Blockchain.com

Mempool.space: mempool.space (recommended) Blockchain.com: blockchain.com/explorer

What makes Bitcoin explorers different:

• Bitcoin uses the UTXO model (Unspent Transaction Outputs).
• Transactions have Inputs and Outputs rather than From/To.
• No smart contracts.
• Includes mining pool and hashrate information.

Mempool.space features:

• Real-time mempool visualization (transactions waiting for confirmation)
• Transaction fee recommendations
• Block and transaction viewing
• Lightning Network data
• Ordinals and inscription information

Querying a Bitcoin transaction:

1. Paste the Transaction ID (TXID) into the search bar.
2. View:
   • Number of confirmations
   • Inputs and outputs
   • Transaction fee
   • Transaction size (bytes)

Bitcoin address types:

Address Type	Prefix	Description
Legacy (P2PKH)	1...	Earliest address format
Script (P2SH)	3...	Supports multisig and other features
SegWit (P2WPKH)	bc1q...	Native Segregated Witness
Taproot (P2TR)	bc1p...	Latest format; supports Ordinals

3.3 Cosmos — Mintscan

URL: mintscan.io

Supported Cosmos chains:

• Cosmos Hub (ATOM)
• Osmosis (OSMO)
• Celestia (TIA)
• Injective (INJ)
• Other IBC-compatible chains

What makes Cosmos explorers different:

• Validator and delegation information
• IBC (Inter-Blockchain Communication) transaction tracking
• Governance proposal viewing
• Staking and unstaking records

3.4 TON — TonScan

URL: tonscan.org

TonScan features:

• Transaction lookup
• Address balances
• Jetton (TON token standard) tracking
• NFT information
• Smart contract viewing

3.5 Explorer Summary Table

Blockchain	Explorer	URL
Ethereum	Etherscan	etherscan.io
BNB Chain	BscScan	bscscan.com
Polygon	PolygonScan	polygonscan.com
Arbitrum	Arbiscan	arbiscan.io
Optimism	OP Etherscan	optimistic.etherscan.io
Base	BaseScan	basescan.org
Avalanche	Snowscan	snowscan.xyz
Solana	Solscan	solscan.io
Bitcoin	Mempool	mempool.space
Cosmos	Mintscan	mintscan.io
TON	TonScan	tonscan.org
Fantom	FtmScan	ftmscan.com
zkSync Era	zkSync Explorer	explorer.zksync.io
Blast	BlastScan	blastscan.io
Sui	SuiScan	suiscan.xyz

Part 4: Practical Explorer Tips

4.1 Confirming a Transfer

After withdrawing from an exchange, confirm the funds have arrived:

1. Obtain the TxHash provided by the exchange.
2. Open the explorer for the relevant chain.
3. Search for the TxHash.
4. Confirm the Status is Success.
5. Verify that the receiving address and amount are correct.

4.2 Tracing Fund Flows

To trace the source and destination of funds for a given address:

1. View the address's transaction history.
2. Focus on large inflows and outflows.
3. Click on the corresponding From/To addresses to trace further.
4. Use address labels to identify known entities such as exchanges and project teams.

4.3 Verifying a Token Contract

Before buying a new token, verify its contract:

1. Search for the token contract address in the explorer.
2. Confirm the contract code has been verified (look for the green checkmark).
3. Review the distribution of holders (Holders tab).
4. Check for suspicious functions (such as unlimited minting permissions).
5. Verify that the liquidity is locked.

4.4 Exporting Transaction Records

Most explorers allow you to export transaction records as a CSV after registering a free account:

1. Register an explorer account (free).
2. Search for your address.
3. Find the "Download CSV" button on the transactions list page.
4. Select the date range and transaction types.
5. Download the CSV file for tax purposes or record-keeping.

4.5 Using the API

Developers and data analysts can use the explorer's API:

• Register for a free API key.
• Use the RESTful API to query on-chain data.
• Free tier typically limits to 5 calls per second.
• Useful for building automated monitoring tools.

Part 5: Multi-Chain Aggregated Explorers

5.1 Blockscout

What it is: An open-source blockchain explorer.

Characteristics:

• Any EVM chain can deploy its own Blockscout instance.
• Fully open source.
• Feature set similar to Etherscan.

5.2 OKLink

What it is: A multi-chain explorer produced by OKX.

Supported chains: 20+ Feature: View multi-chain data in a unified interface.

5.3 3xpl

What it is: A minimalist multi-chain explorer.

Characteristics: Clean interface; supports multiple chains.

Part 6: Common Questions

Q1: Why does my transaction show as failed on the explorer? Common reasons for transaction failure:

• Out of Gas
• Contract execution error (Reverted)
• Slippage exceeded the configured setting (for DEX trades)
• Insufficient balance

Even if a transaction fails, the gas fee is still deducted.

Q2: My transaction has been showing as Pending for a long time. What should I do?

• The gas price was set too low and the transaction is not being picked up by miners.
• You can replace the transaction by sending a new one with the same nonce at a higher gas price.
• In MetaMask, use the "Speed Up" or "Cancel" function.

Q3: Is the data on blockchain explorers real-time? Essentially yes, though there may be a lag of a few seconds to a few minutes. Transactions are typically visible in the explorer within 1 to 2 blocks after confirmation.

Q4: Are the token prices shown on the explorer accurate? Token prices on explorers typically come from third-party data sources such as CoinGecko or CoinMarketCap. They are accurate for major tokens, but may be inaccurate or missing for very low-cap tokens.

Q5: How can I tell if an address is a contract or a regular wallet? Search the address in the explorer. If it is a contract, the page will typically show a "Contract" tab. On Etherscan, a contract icon is displayed next to contract addresses.

Part 7: Safe Use of Blockchain Explorers

7.1 Safety Principles

1. Use only official explorers: Always verify the URL is correct.
2. Never enter your private key on an explorer: Explorers only need your public address.
3. Use Write Contract with caution: Understand what a function does before interacting with it.
4. Do not click on advertising links on the explorer: They may be phishing attempts.

7.2 Using Explorers to Protect Yourself from Scams

• Verify that on-chain data cited by project teams is accurate.
• Check whether a token contract contains a backdoor.
• Trace the fund flows of suspicious addresses.
• Verify the authenticity of airdrop activities.

Summary

A blockchain explorer is a fundamental tool in every crypto user's kit. Mastering Etherscan (or any EVM explorer) will give you the skills to navigate 80%+ of chain explorers. For non-EVM chains such as Solana and Bitcoin, the interface and terminology differ, but the core concepts of looking up transactions, addresses, and contracts are universal.

Build the habit of using a blockchain explorer: verify every important transaction in the explorer, check every new token's contract, and inspect the contract before interacting with any DApp. These habits will significantly improve the safety of your on-chain operations.

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