Blockchain Course

Learn about blockchain, blockchain consensus algorithms, cryptocurrencies and more.

The history of money

The history of money

What is money? Money is a technology that has been as essential to the development of civilization as the wheel itself. Money is any good that is widely accepted as a medium of exchange during the transaction of goods and services. It facilitates commerce by serving...

What is a blockchain?

What is a blockchain?

What is a blockchain? Distributed ledger technologies are based on a concept known as blockchain. The term “blockchain” refers to the basic structure that is a chain of blocks. The “block” in a blockchain is where transaction records or various pieces of information...

What is a smart contract?

What is a smart contract?

What is a smart contract? Smart contracts are computer programs that run on the blockchain. They are digital agreements encoded or written, with specific sets of rules that govern how and when the contracts will be signed, much like traditional contracts that are...

What are nodes?

What are nodes?

What is a node? A node is essentially a computer on the blockchain that runs network software to recognize and broadcast valid transactions. Nodes communicate which each other and reach consensus, or a common agreement, as to which transactions are legitimate. When we...

What is a consensus mechanism?

What is a consensus mechanism?

What is a consensus mechanism? Consensus refers to the act of coming to an agreement among individuals or groups. A consensus mechanism is the method by which decentralized networks agree on which transactions are valid before being confirmed as legitimate across the...

What is Proof of Work (PoW)?

What is Proof of Work (PoW)?

Proof-of-Work is the original consensus mechanism that is utilized by the Bitcoin blockchain. Bitcoin’s decentralization refers to the global network of nodes and miners that is responsible for broadcasting and confirming valid transactions; they are not controlled by...

What is Proof of Stake (PoS)?

What is Proof of Stake (PoS)?

Proof-of-Stake (PoS) was developed as an alternative consensus mechanism to Proof-of-Work. Proponents of PoS typically say that PoW is too energy and resource intensive. As a response, they developed Proof-of-Stake which aims to solve these issues inherent to PoW. In...

What is decentralization?

What is decentralization?

The term decentralization, when talking about blockchains, describes the network architecture. It infers that the network is not localized to central server-based computation. Blockchains are typically a globally distributed network of nodes and/or miners. Emergent...

What is immutability?

What is immutability?

Immutability is a major value proposition of the blockchain. Traditional, centralized computing often presents hackers with multiple security vulnerabilities they can exploit to alter and/or access user records. In decentralized computing, data can be hashed onto the...

What is trustlessness?

What is trustlessness?

Trustlessness, contrary to how it may sound, actually refers to the high degree of trust we can have when using the blockchain. Due to the blockchain’s reliance on cryptographic signing, users across the network can be assured that transactions will always arrive at...

What are stablecoins?

What are stablecoins?

Stablecoins are cryptocurrencies that are pegged 1:1 to local fiat currency, such as the US Dollar. This peg is maintained by collateralized assets held as crypto or fiat in traditional bank accounts.

What is crypto lending?

What is crypto lending?

Users on DeFi platforms can access loans pegged in stablecoins by collateralizing their crypto holdings. This enables people access to the USD value of their crypto holdings without having to sell their assets. When they are able to pay back the loan, their assets are...

What is cryptography?

What is cryptography?

What is cryptography? Cryptography is the study of secure communications. The etymology, or word origin, reveals much of the meaning behind the word. “Crypto”- is the Latin prefix for hidden or secure, while “graphy” means writing.  In computer science, cryptography...