What is a decentralized application (dApp)?

A decentralized application (dApp) is an application that runs on a distributed computing system, such as a blockchain network. Unlike traditional apps, dApps are not controlled by a single entity and are instead open-source, transparent, and operate autonomously. They are also powered by tokens and can be used to create incentives for users to participate in the network.

Example: CryptoKitties is a popular dApp game that runs on the Ethereum blockchain. Players can purchase, collect, breed, and trade digital cats that each have unique characteristics. The game is powered by Ethereum tokens, and players must use these tokens to purchase and trade cats.

What is the difference between Bitcoin and blockchain?

Bitcoin is a digital currency or cryptocurrency, while blockchain is the technology that powers it.

Bitcoin is a decentralized digital currency that can be used to send and receive payments directly between two parties. It is based on a distributed ledger technology called blockchain, which is a secure, tamper-proof digital ledger that records and stores all Bitcoin transactions.

Blockchain, on the other hand, is a distributed ledger technology that forms the basis of Bitcoin and other digital currencies. It is a decentralized, secure, and immutable digital ledger that records and stores all transactions across a peer-to-peer network. It is a public ledger that is shared among all participants in the network, which makes it difficult to tamper with.

For example, when someone sends a Bitcoin transaction, it is recorded on the blockchain and can be seen by all participants in the network. This ensures that the transaction is secure and that the funds are sent to the right person.

What is the difference between Ethereum and Solidity?

Ethereum is a public blockchain platform that enables users to create and execute decentralized applications (DApps) and smart contracts. It is powered by the Ethereum Virtual Machine (EVM), which is a decentralized, Turing-complete virtual machine that can execute scripts using an international network of public nodes.

Solidity is a programming language used to write smart contracts on the Ethereum blockchain. It is a statically typed language, designed to target the EVM, and is used to create contracts for various applications such as voting, auctions, crowdfunding, and multi-signature wallets. It is designed to be human-readable, secure, and efficient.

For example, if you wanted to create a smart contract to facilitate a crowdfunding campaign, you would use Solidity to write the code for the contract. This code would then be deployed to the Ethereum blockchain and the contract would be executed according to the rules set within the code.

What is a blockchain and how does it work?

A blockchain is a type of distributed ledger technology (DLT) that stores data in a chain of blocks. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. By design, blockchains are inherently resistant to modification of the data. The blockchain is a shared, immutable ledger that records transactions between two parties in a permanent, verifiable, and transparent way.

For example, let’s say that two people, Alice and Bob, want to make a transaction. Alice has some cryptocurrency that she wants to transfer to Bob. First, Alice and Bob will agree on the terms of the transaction, including the amount of cryptocurrency that Alice will send to Bob. Then, Alice will initiate the transaction by broadcasting her request to the network.

The request will be validated by the network using consensus algorithms, and once the transaction is validated, it will be stored in a block on the blockchain. The block also contains a cryptographic hash of the previous block, a timestamp, and other transaction details. Once the block is added to the blockchain, it cannot be modified or deleted, and the transaction is complete.

How does Bitcoin work?

Bitcoin is a digital currency that is created and held electronically. It is the first decentralized digital currency, as the system works without a central bank or single administrator. The network is peer-to-peer and transactions take place between users directly, without an intermediary.

For example, if Alice wants to send Bob some Bitcoin, she will use her wallet to send a message to the Bitcoin network. This message will include Alice’s public key, Bob’s public key, and the amount of Bitcoin that Alice wants to send. The message is then broadcasted to the network, and the miners on the network will verify the transaction. Once the transaction is verified, it is added to the blockchain and Alice’s wallet will be updated to reflect the change in her balance. Bob’s wallet will also be updated to reflect the change in his balance.

What is Bitcoin?

Bitcoin is a digital currency, or cryptocurrency, that was created in 2009. It is a decentralized currency, meaning that it is not controlled by any government or central bank. Bitcoin is used for peer-to-peer transactions, and is not backed by any physical currency.

For example, if you wanted to buy something online with Bitcoin, you would send the payment to the seller’s Bitcoin address. The seller would then receive the payment and be able to use it to purchase goods or services.

What is a distributed ledger?

A distributed ledger is a type of database that is shared, replicated, and synchronized across multiple sites, institutions, or geographies. It allows for the secure and transparent recording of transactions and other data without the need for a central authority or third-party intermediary.

For example, a distributed ledger could be used to track the ownership of digital assets, such as cryptocurrencies. Every time a transaction is made, it is recorded on the ledger, with each node in the network having an identical copy of the ledger. This ensures that all participants have an up-to-date view of the ledger and that all transactions are valid and traceable.

What is blockchain technology?

Blockchain technology is a decentralized, distributed digital ledger system that records and verifies transactions across a peer-to-peer network. It is an immutable, secure, and transparent record of data that is shared among multiple computers. Each “block” of data is cryptographically linked to the previous block, forming a chain of data that is difficult to modify.

For example, Bitcoin is a digital currency that uses blockchain technology to securely and transparently record all of its transactions. Each transaction is recorded in a block, which is then linked to all of the other blocks in the chain. This distributed ledger system ensures that all records are accurate and up-to-date, and prevents anyone from tampering with the data.

How does Ethereum mining work?

Ethereum mining is the process of maintaining the Ethereum ledger through solving complex mathematical problems. Miners are rewarded for their efforts with small amounts of Ether.

For example, when a miner successfully solves a problem, they are rewarded with a certain amount of Ether. This Ether is then added to the Ethereum blockchain, and the miner is rewarded with a certain amount of Ether for their efforts. The miner can then use this Ether to pay for goods and services or to exchange it for other currencies.