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Polkadot is a layer-0 blockchain protocol designed to interconnect various application-specific blockchains (parachains) to facilitate the exchange of information between them. The Polkadot blockchain (relay chain) does not support applications but provides consensus and security to the connected chains.

Dr. Gavin Wood, an Ethereum co-founder and the creator of Solidity smart contract programming language, developed the concept of modular blockchains and released the whitepaper for Polkadot in October 2016.

Polkadot’s heterogeneous blockchain architecture has the following noteworthy features:

• Shared security: All the blockchain networks in the Polkadot ecosystem (parachains) borrow the security of the Polkadot blockchain (relay chain).

• Interoperability: Polkadot parachains can communicate with one another via the relay chain enabling many use cases.
• Application-specific design: The parachains in this ecosystem have the freedom to customize their application layer as long as the block can achieve finality in the relay chain.

The Polkadot network is an interconnected network of several blockchains that can exchange resources and information secured by a unique implementation of Proof-of-Stake (POS) consensus.

Architecture: The network is made of two types of blockchains – Relay chain and Parachains.

Parachains: these are the various blockchains connected to the Polkadot ecosystem to borrow its security and benefit from its interoperability features.

Relay chain: The parent Polkadot blockchain is called the relay chain. It acts as the communication channel for the parachains and provides security to the system by having each parachain post their consensus information to the relay chain frequently.

Consensus: The Polkadot network implements Proof-of-Stake consensus by design. The consensus of the parachains is tied to the relay chain to ensure their security. There are four roles within the system to facilitate this:

• Collators: Secure the parachains.
• Validators: Secure the relay chain.
• Nominators: Stake their tokens with validators to delegate their validation duties.
• Fishermen: Monitor the network and report bad behavior to validators.

The Polkadot Mainnet launched on 27th May 2020 and temporarily followed a Proof-of-Authority (POA) design with just six validators. It transitioned to POS on 18th June 2020.

Polkadot conducted its first parachain auctions at the end of 2021 to decide the first set of projects to win seats in the Polkadot network. Acala, Moonbeam, Astar, Parallel, and Clover were the first set of protocols to win the seats.

Polkadot network activity is validated using the Proof-of-Stake (POS) consensus mechanism. The Polkadot POS is tweaked for high throughput and slow finality. The many parachains in the network produce blocks at a rapid pace, and to accommodate all this information, slow finality of blocks is required to ensure that all parachains are in agreement with one another. This technique is implemented to tackle malicious events like double-spending.

Polkadot network validators have enormous value locked into the network that ensures high-security standards. The security and robustness of the system will keep on improving as more validators and parachains are added to the network.

Oftentimes, online theft and fraud are conducted not by attacking the blockchain network but by targeting users’ online/hot wallets to expose their private keys. Such malicious actors try to trick users into revealing their private keys or attack their system with malware.

Hardware/cold wallets overcome this vulnerability by storing private keys in physical storage devices cut off from the web and, therefore, out of the reach of malicious actors.

Prominent cryptocurrencies like DOT are available on many centralized exchanges and decentralized exchanges (DEXs). CEX users compromise complete ownership over their crypto assets, as they do not have access to the private keys of the wallets holding their funds. Most CEXs also require KYC information these days, which is not ideal for people seeking privacy over their online activity.

DEXs are ideal for investors who prefer privacy and ownership over their assets. However, there are still some loose ends in the security front when online wallets are used, as they may expose their private keys resulting in thefts and frauds. 

For better security, users can buy and transfer DOT into Ledger hardware wallets and have supreme control over their assets and private keys with Ledger. Ledger Live is a dynamic tool to track the real-time performance of one’s investments and make diligent investment decisions.

Using Ledger services is pretty simple and convenient, users can even use their Credit/Debit cards or PayPal to buy DOT. Follow these steps:

• Get a Ledger hardware wallet.
• Download and install Ledger web or mobile application.
• Connect the Ledger app with the Ledger hardware wallet.
• Install the Polkadot application from the app catalog.
• Start buying DOT using Ledger Live.