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Blockchain is a distributed, decentralized public ledger, which is a continuously growing list of records stored in the form of blocks. These blocks in a blockchain are connected through cryptography, which keeps the transactions’ confidentiality intact. A blockchain is a time-stamped series of immutable (tamper-proof) records of data, which is not managed by a central authority but by a computer cluster.
Every data shared on a blockchain is visible to all participants, and everyone is accountable for their actions. A blockchain perfectly defines a democratized system.
For all of its automation, security, and binding trust capabilities in a decentralized manner, some predict this is the end of Centralized platforms as we know them. Although that might not necessarily be true, centralized platforms face competition, something they haven’t faced for millennia.
The Debate of Our Times
A Public Blockchain (also called Permissionless blockchain) does not require anyone’s permission to participate in the network. Anyone can join the network, read, write, or participate in the blockchain. A public blockchain is decentralized and does not have a single entity that controls the network.
On the other side of the spectrum are Private Blockchains. A private blockchain is a permissioned blockchain. Private blockchains work based on access controls, which restrict the people who can participate in the network. One or more entities control the network, which leads to reliance on third parties to transact. A Private Blockchain might sound like an Oxymoron, but it means more than that.
It is difficult to argue which one is better, as both have their niche use cases and preferred market. Thus, let us deeply analyze each area and let you make that decision for yourself.
Public Blockchains Vs. Private Blockchains
A public blockchain is permissionless. Data on a public blockchain is secure, as it is impossible to modify or alter data once validated. Bitcoin and Ethereum are well-known examples of a public blockchains.
Only the entities participating in a transaction will know about it in a private blockchain, whereas the others will not access it. Hyperledger Fabric of Linux Foundation is a perfect example of a private blockchain.
|Sl. No.||Public Blockchains||Private Blockchains|
|1||Ownership||There is no ownership structure in a public blockchain. It is open to all, and ownership is distributed among all its members.||A Private Blockchains’ ownership status depends on the stake divided by the team that initiated the network.|
|2||Network Influence||No single person or group can have any significant influence over the network.||The network is influenced by the major stakeholders who take care of day-to-day activities.|
|3||Decision Making||A democratic decision-making process is followed. All members’ input is considered while making any changes.||The stakeholders of the network are involved in the decision-making process. No inputs are taken from the users of the network|
|4||Efficiency||Public blockchain losses in efficiency what it gains in decentralization. Since the network is distributed among nodes globally, the efficiency of the project is drastically reduced.||Due to its relatively centralized nature, the efficiency of a Private network is incredibly high. Therefore, applications that need fast transaction speed and bandwidth can depend on a Private blockchain network.|
|5||Security||A public network is more secure, owing to its decentralization and active participation. Due to the higher number of nodes in the network, it is nearly impossible for ‘bad actors’ to attack the system and gain control over the consensus network. A private blockchain is more prone to hacks, risks, and data breaches/ manipulation. It is easy for bad actors to endanger the entire network.||A Private blockchain is susceptible to all attacks that a Centralized entity might be exposed to. Some possible security flaws include hostile takeovers, third-party manipulation, undue influence, hacks, and majority attacks.|
|6||Scalability||A public blockchain cannot compete with a private blockchain regarding scalability issues as it is slow and can process transactions at a slow pace. However, as only a few nodes need to manage data in a private blockchain, transactions can be supported and processed much faster.||A Private blockchain, on the other hand, is highly scalable. As it only requires a few nodes to function, it can be easily scaled to include as many participants are needed.|
|7||Perceived Use Cases||Any person/group who identifies with the decentralization of a public network, security, and openness would be a public blockchain user.
One can find a use case for a public blockchain in any place where there is a need for openness and transparency and no need for a third party or intermediary. E.g., money transfer, governance, third-party reliant businesses, etc.
|Private Blockchains have a relatively niche market. Private blockchains are a lucrative option for parties that must reply to other parties while not allowing outside influence.
Any area where secrecy is of utmost importance can do well with private blockchain infrastructure.
|8||Major Players||Bitcoin, Ethereum, Litecoin, Monero||Hyperledger Fabric, Corda R3, Ethereum Enterprise Alliance|
As you may know, blockchain technology is a highly complex and profound field consisting of numerous concepts and blockchains. It is important to understand these concepts. Awareness of the features that differentiate public blockchains from private ones is necessary and advantageous to elevate your understanding to the next level. Understanding the types of blockchain networks is as essential as knowing what a blockchain is and how it applies to cryptocurrency.
And so, the usage of Public and Private blockchains depends on implementation. For example, if you want to use blockchain in a system that needs more decentralization and transparency, then the Permissionless blockchain is the best. On the other side, if you want only a handful of people to have full access to the data, then the Permissioned blockchain is the best.