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Crypto Glossary/Public Blockchain

Public Blockchain

Public blockchains are decentralized, transparent, and open to anyone. They are used for cryptocurrencies, supply chain management, voting systems, and decentralized applications. Challenges include scalability, energy

TLDR - Public Blockchain

A public blockchain is a decentralized and transparent digital ledger that is open to anyone and can be accessed and verified by anyone. It is maintained by a network of computers (nodes) spread across the globe, and transactions recorded on the blockchain are permanent and immutable. Public blockchains are often used for cryptocurrencies and enable peer-to-peer transactions without the need for intermediaries.

What is a Public Blockchain?

A public blockchain is a type of blockchain that is open to the public and allows anyone to participate in the network. It is a decentralized and distributed ledger that records transactions and other data in a transparent and secure manner. Public blockchains are often associated with cryptocurrencies like Bitcoin and Ethereum, but they can also be used for various other applications.

Key Features of Public Blockchain

Public blockchains possess several key features that distinguish them from other types of blockchains:


Public blockchains are decentralized, meaning that there is no central authority or single entity controlling the network. Instead, the blockchain is maintained by a network of computers (nodes) spread across the globe. This decentralization ensures that no single entity has control over the blockchain, making it resistant to censorship and tampering.


Public blockchains are transparent, meaning that all transactions and data recorded on the blockchain are visible to anyone. This transparency allows for greater accountability and trust as anyone can verify the integrity of the blockchain. It also enables public scrutiny and prevents fraudulent activities.

Open Access

Public blockchains are open to anyone, meaning that anyone can join the network, participate in the consensus process, and validate transactions. This open access fosters inclusivity and allows for a wide range of participants, ensuring that no single entity or group can control the blockchain.


Transactions recorded on a public blockchain are permanent and cannot be altered or deleted. Once a transaction is added to the blockchain, it becomes part of a chain of blocks that are linked together using cryptographic hashes. This immutability ensures the integrity of the blockchain and prevents fraud or manipulation of past transactions.

Consensus Mechanisms

Public blockchains use consensus mechanisms to agree on the state of the blockchain and validate transactions. These mechanisms ensure that all participants in the network reach a consensus on the validity of transactions and the order in which they are added to the blockchain. Common consensus mechanisms used in public blockchains include Proof of Work (PoW) and Proof of Stake (PoS).

Use Cases of Public Blockchain

Public blockchains have a wide range of use cases beyond cryptocurrencies:

Financial Transactions

Public blockchains like Bitcoin and Ethereum are widely used for financial transactions, enabling peer-to-peer transfers of digital currencies without the need for intermediaries such as banks. These blockchains provide a secure and transparent platform for conducting financial transactions globally.

Supply Chain Management

Public blockchains can be used to track and verify the movement of goods in a supply chain. By recording each step of the supply chain on the blockchain, stakeholders can ensure transparency, traceability, and authenticity of products. This can help prevent counterfeiting, improve efficiency, and enhance trust among participants.

Voting Systems

Public blockchains can be utilized for secure and transparent voting systems. By recording votes on the blockchain, it becomes virtually impossible to tamper with the results. This can help eliminate voter fraud, increase voter participation, and ensure the integrity of the electoral process.

Decentralized Applications (DApps)

Public blockchains provide a platform for the development and deployment of decentralized applications (DApps). These applications run on the blockchain and leverage its decentralized and transparent nature to provide secure and censorship-resistant services. DApps can range from financial services to social media platforms and gaming.

Challenges of Public Blockchain

While public blockchains offer numerous advantages, they also face certain challenges:


Public blockchains often struggle with scalability as the number of transactions and participants increases. The consensus mechanisms used in public blockchains require all nodes to validate and store every transaction, which can lead to slower transaction speeds and increased costs. Various solutions, such as layer 2 protocols and sharding, are being explored to address scalability issues.

Energy Consumption

Public blockchains that use Proof of Work (PoW) consensus mechanisms, such as Bitcoin, require significant computational power and energy consumption. The process of mining, which secures the blockchain, involves solving complex mathematical puzzles. This energy-intensive process has raised concerns about the environmental impact of public blockchains.

Regulatory Challenges

Public blockchains operate in a regulatory gray area in many jurisdictions. The decentralized and pseudonymous nature of public blockchains can make it challenging for authorities to enforce regulations related to anti-money laundering (AML) and know-your-customer (KYC) requirements. Striking a balance between innovation and regulatory compliance remains a challenge.


Public blockchains are decentralized, transparent, and open to anyone. They provide a secure and immutable platform for various applications, including financial transactions, supply chain management, voting systems, and decentralized applications. While public blockchains face challenges such as scalability, energy consumption, and regulatory compliance, ongoing research and development aim to address these issues and unlock the full potential of public blockchains.

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