Polkadot is a next-generation blockchain that pioneered the Nominated Proof-of-Stake (NPoS) consensus mechanism and aims to create an ecosystem of different blockchains connected to one another. Its native token, DOT, was founded in May 2020 to solve critical problems in the crypto industry.
Note
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Connecting the dots
The more data crammed into a blockchain, the slower it gets. At the same time, different types of blockchains have historically not been able to communicate with one another. These are some of the problems that Polkadot was designed to solve.
At the heart of Polkadot, three specific functions set the protocol apart from the rest. They are:
- The Relay Chain
- Parachains
- Polkadot bridges
The Relay Chain enables external blockchains, apps, and services to communicate with each other securely, without an intermediary. It allows blockchains to work in harmony, allowing each of them to focus on a specialised function so that the processing demand is reduced.
The blockchains connected to the Polkadot network are called parachains and all of them feed into the Relay Chain, which is the main blockchain. The Relay Chain and parachains are like a relay race where one blockchain passes the baton onto the next, handing it off to the main blockchain at the finish line.
Polkadot’s bridges connect the dots by linking blockchains such as Ethereum or Bitcoin to the Polkadot network. The bridges create a compatible way for transferring data – not only tokens – from one blockchain to another, even if they have different protocols and rules.
These technologies create the groundwork for a Web3 ecosystem: a decentralised, permissionless web aimed at giving users ownership of their data and identity while enabling secure digital transactions.
How does Nominated Proof-of-Stake work?
You may already know that Proof-of-Stake blockchains, like Ethereum and Cardano, use a network of validators to create new blocks and verify transactions. Participants can stake their crypto to become validators: they’ll earn more crypto if they verify transactions correctly, or lose their staked crypto if they behave incorrectly or maliciously.
Normally, Proof-of-Stake protocols randomly select which validators get to verify the next set of transactions (though having more crypto at stake improves the chances of being selected).
With Nominated Proof-of-Stake blockchains, validators aren’t selected randomly. Instead, there are specialised nodes called nominators who choose which validators will verify transactions.
Nominators are required to stake a large amount of DOT, meaning they have more to lose if they make a bad selection. They can base their selection on various criteria, such as the validator’s previous track record, whether or not they’ve verified their identity, and how much “skin in the game” (staked crypto) the validator has.
Security incidents
Polkadot has experienced the following security incidents:
Parity Technologies Multi-Sig Wallet Issues (July 2017)
This issue resulted in Parity Technologies losing access to over $90.00 million worth of ETH, which was approximately 66.00% of Polkadot's token sale proceeds. The funds remain frozen, and returning them would require an Ethereum hard fork. Source: TechCrunch
Parity Code Vulnerability (November 2017)
A vulnerability in Parity's code caused 587 wallets to be permanently frozen, containing approximately 513,774 ETH and various ERC-20 tokens. Source: CNBC.com
Parity Wallet Bug (July 2017)
A bug enabled an attacker to steal 350,000 ETH, valued at approximately $30.00 million at the time, from Parity wallets. Source: Coindesk
Polkadot Block Production Halt (May 2021)
Block production was halted for about 71 minutes due to an error caused by differences in compiler versions between the native runtime and Polkadot's on-chain WASM runtime. The issue was resolved by asking validators to downgrade their client version. Source: Medium
Polkadot Node Downtime (June 2021)
Several Polkadot nodes went down, leading to performance issues and slower block times. The problem was remedied by downgrading the Polkadot v0.8.30 release. Source: Polkadot Diligence Report
The above list of incidents may not be exhaustive. As always, it’s important that you do your own research to ensure you’re comfortable with an asset’s associated risks before investing in it.
Token supply and concentration
Polkadot has a maximum supply of 1.65 billion DOT, with 100 % in circulation as of January 2026. The top 10 wallet addresses collectively hold ~489 million DOT (~29.6% of the maximum 1.65 billion token supply).
Visit this external link to see the distribution among DOT’s top token holders.
Tip
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This information is not intended to be nor does it constitute financial, tax, legal, investment or other advice; nor is it a call to trade. The information is intended as general market commentary for information purposes only. Before making any decision or taking any action regarding your finances, you should consult a qualified Financial Advisor.