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    • Introduction
      • 🔷1. Ethereum Basics
        • 1.1 Ethereum: Concept, Infrastructure & Purpose
        • 1.2 Properties of the Ethereum Infrastructure
        • 1.3 Ethereum vs. Bitcoin
        • 1.4 Ethereum Core Components
        • 1.5 Gas Metering: Solving the Halting Problem
        • 1.6 web2 vs. web3: The Paradigm Shift
        • 1.7 Decentralization
        • 1.8 Cryptography, Digital Signature & Keys
        • 1.9 Ethereum State & Account Types
        • 1.10 Transactions: Properties & Components
        • 1.11 Contract Creation
        • 1.12 Transactions, Messages & Blockchain
        • 1.13 EVM (Ethereum Virtual Machine) in Depth
        • 1.14 Transaction Reverts & Data
        • 1.15 Block Explorer
        • 1.16 Mainnet & Testnets
        • 1.17 ERCs & EIPs
        • 1.18 Legal Aspects in web3: Pseudonymity & DAOs
        • 1.19 Security in web3
        • 1.20 web2 Timescales vs. web3 Timescales
        • 1.21 Test-in-Prod. SSLDC vs. Audits
        • Summary: 101 Keypoints
      • 🌀2. Solidity
        • 2.1 Solidity: Influence, Features & Layout
        • 2.2 SPDX & Pragmas
        • 2.3 Imports
        • 2.4 Comments & NatSpec
        • 2.5 Smart Contracts
        • 2.6 State Variables: Definition, Visibility & Mutability
        • 2.7 Data Location
        • 2.8 Functions
        • 2.9 Events
        • 2.10 Solidity Typing
        • 2.11 Solidity Variables
        • 2.12 Address Type
        • 2.13 Conversions
        • 2.14 Keywords & Shorthand Operators
        • 2.15 Solidity Units
        • 2.16 Block & Transaction Properties
        • 2.17 ABI Encoding & Decoding
        • 2.18 Error Handling
        • 2.19 Mathematical & Cryptographic Functions
        • 2.20 Control Structures
        • 2.21 Style & Conventions
        • 2.22 Inheritance
        • 2.23 EVM Storage
        • 2.24 EVM Memory
        • 2.25 Inline Assembly
        • 2.26 Solidity Version Changes
        • 2.27 Security Checks
        • 2.28 OpenZeppelin Libraries
        • 2.29 DAppSys Libraries
        • 2.30 Important Protocols
        • Summary: 201 Keypoints
      • 🔏3. Security Pitfalls & Best Practices
        • 3.1 Solidity Versions
        • 3.2 Access Control
        • 3.3 Modifiers
        • 3.4 Constructor
        • 3.5 Delegatecall
        • 3.6 Reentrancy
        • 3.7 Private Data
        • 3.8 PRNG & Time
        • 3.9 Math & Logic
        • 3.10 Transaction Order Dependence
        • 3.11 ecrecover
        • 3.12 Unexpected Returns
        • 3.13 Ether Accounting
        • 3.14 Transaction Checks
        • 3.15 Delete Mappings
        • 3.16 State Modification
        • 3.17 Shadowing & Pre-declaration
        • 3.18 Gas & Costs
        • 3.19 Events
        • 3.20 Unary Expressions
        • 3.21 Addresses
        • 3.22 Assertions
        • 3.23 Keywords
        • 3.24 Visibility
        • 3.25 Inheritance
        • 3.26 Reference Parameters
        • 3.27 Arbitrary Jumps
        • 3.28 Hash Collisions & Byte Level Issues
        • 3.29 Unicode RTLO
        • 3.30 Variables
        • 3.31 Pointers
        • 3.32 Out-of-range Enum
        • 3.33 Dead Code & Redundant Statements
        • 3.34 Compiler Bugs
        • 3.35 Proxy Pitfalls
        • 3.36 Token Pitfalls
        • 3.37 Special Token Pitfalls
        • 3.38 Guarded Launch Pitfalls
        • 3.39 System Pitfalls
        • 3.40 Access Control Pitfalls
        • 3.41 Testing, Unused & Redundand Code
        • 3.42 Handling Ether
        • 3.43 Application Logic Pitfalls
        • 3.44 Saltzer & Schroeder's Design Principles
        • Summary: 201 Keypoints
      • 🗜️4. Audit Techniques & Tools
        • 4.1 Audit
        • 4.2 Analysis Techniques
        • 4.3 Specification, Documentation & Testing
        • 4.4 False Positives & Negatives
        • 4.5 Security Tools
        • 4.6 Audit Process
        • Summary: 101 Keypoints
      • ☝️5. Audit Findings
        • 5.1 Criticals
        • 5.2 Highs
        • 5.3 Mediums
        • 5.4 Lows
        • 5.5 Informationals
        • Summary: 201 Keypoints
  • 🌱CARE
    • CARE
      • CARE Reports
  • 🚩CTFs
    • A-MAZE-X CTFs
      • Secureum A-MAZE-X
      • Secureum A-MAZE-X Stanford
      • Secureum A-MAZE-X Maison de la Chimie Paris
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  1. LEARN
  2. Introduction
  3. 1. Ethereum Basics

1.15 Block Explorer

Previous1.14 Transaction Reverts & DataNext1.16 Mainnet & Testnets

Last updated 1 year ago

If we want to take a look at what has happened in the past in terms of the transactions on Ethereum, the contracts that they interacted with, then the application that allows us to look at all this data is what is known as a block explorer: it lets us explore the various blocks and their contents on the blockchain.

It's implemented as an application, a web portal if you will, and it gives us real-time on-chain data about all the transactions, the blocks, the Gas and everything that we have discussed so far. All this rich information is available in a transparent manner on the blockchain and can be accessed by everyone via this block explorer application.

In the case of Ethereum we have several block explorers. The most popular one is . We also have , , or .

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Etherscan
Etherchain
Ethplorer
Blockchair
Blockscout