Block chain solidity & IPFS

......................................is usually the first line of code in any Solidity file. This directive specifies the compiler version to be used for the compilation of the smart contract code written in Solidity.

• include

• pragma

• import

• solidity

..........................................is a statically-typed curly-braces programming language designed for developing smart contracts that run on Ethereum.

• Solidity

• Metamask

• IPFS

• Infura

....................................is a free web and mobile crypto wallet that allows users to store and swap cryptocurrencies, interact with the Ethereum blockchain ecosystem, and host a growing array of decentralized applications (dApps).

• MetaMask

• Ethereum

• Solidity

• Web3

............................... is a comprehensive development framework and toolset for building decentralized applications (dapps) on the Ethereum blockchain. It offers a range of powerful tools that streamline the entire development process, from smart contract creation and testing to deployment and asset management.

• Metamask

• Truffle Suite

• Ganache

• Infura

.......................... Online IDE is a powerful toolset for developing, deploying, debugging, and testing Ethereum and EVM-compatible smart contracts

• Remix

• Eclipse

• Netbeans

• VS code

......................................................... is a standard way to interact with smart contracts in the Ethereum ecosystem. It's an essential component of smart contracts, which are pieces of code stored on the Ethereum blockchain and executed on the Ethereum Virtual Machine (EVM).

• Application Binary Interface(ABI)

• Application Program Interface (ABI)

• Application Binary Inheritance

• Access Binary Interface

...................................................... is a peer-to-peer hypermedia protocol

• InterPlanetary File System

• International Planet File System

• Distributed File System

• Hypermedia File System

what is CID in IPFS?

• Creation Identifier (CID) is a unique label used to identify the date of creation

• Content Identifier (CID) is a unique label used to identify content stored or referenced on IPFS (InterPlanetary File System)

• Control Identifier (CID) is a unique label used to identify control authority of the IPFS

IPFS-Cluster uses a leader-based consensus algorithm .....................to coordinate storage of a pinset, distributing the set of data across the participating nodes. 

• Raft

• PoW

• PoS

• DAG

What is the port number for IPFS API server

• 5001

• 4001

• 9094

• 8080