DOT

Polkadot is a decentralized, nominated proof-of-stake blockchain platform with smart contract functionality whose native token is DOT. It is designed as a multi-chain, sharded protocol that lets independent blockchains exchange data and assets without centralized intermediaries, providing a base layer for decentralized applications that span several chains. The architecture centers on a main chain called the Relay Chain, which handles consensus and security, plus parallel chains (parachains) that run application-specific logic, parathreads with pay-as-you-go connectivity, and bridges to external networks such as Ethereum.

The protocol offers parachains three properties: sovereignty (each chain sets its own governance and transaction rules), shared security (the Relay Chain provides pooled cryptoeconomic security so parachains need not recruit their own validator sets), and interoperability through a common data-exchange standard, XCM, with cross-chain messages routed via the XCMP protocol. Development teams build chains with the Polkadot SDK (and the Substrate framework); such chains can operate standalone as "solochains" or connect as parachains. The codebase is written in Rust, released under GPL-3.0, and maintained in the paritytech/polkadot-sdk repository, with polkadot and gossamer as implementations.

Polkadot uses an on-chain governance system in which DOT holders vote on protocol changes including fees, inflation and code upgrades; the model moved from Governance V1 to OpenGov, and Council members and Relay Chain validators are selected through the Phragmén election method. The network can be upgraded without forks. Consensus relies on the BABE (Blind Assignment for Blockchain Extension) block production protocol derived from Ouroboros, with validators producing and validating blocks and nominators staking DOT behind chosen validators; collators collect valid parachain transactions for validators and fishermen report misbehavior.

Founding story

Polkadot was created by Ethereum co-founder Gavin Wood together with Robert Habermeier and Peter Czaban. Wood published the Polkadot white paper in 2016. Habermeier is a Thiel Fellow and blockchain and cryptography researcher; Czaban is a former Technology Director at the Web3 Foundation. Wood is also credited with founding Parity Technologies, creating the Solidity smart contract language and coining the term Web3.

Business model

Polkadot is an open-source protocol rather than a fee-charging vendor. Its native DOT token is used to pay for Coretime, which buys secure computation and interoperability on the network, and to reserve parachain identifiers for rollups; DOT is also bonded to connect parachains. Access to slots was historically allocated through candle-style parachain auctions in which projects committed DOT as collateral.

Network economics run through DOT issuance and burns rather than corporate revenue: a fixed annual expansion of 120,000,000 DOT is split 85% to stakers and 15% to the on-chain Treasury, which funds Polkadot-related projects via OpenGov referenda. Net inflation is gross inflation less supply burned through treasury burns and Coretime sales. In November 2024 the token model changed from exponential supply growth at a constant inflation rate to linear growth with a decreasing inflation rate; Kusama retains the constant-rate model.

Traction

The mainnet has operated since May 2020 and parachains since December 2021, with the first five parachain slots allocated at the end of 2021. Kusama, the canary network, processed roughly 143,000 transactions per second at 23% capacity in a December 2024 stress test. Core development continues through Parity Technologies, with the codebase publicly maintained.

Latest developments

In November 2024 Polkadot moved from exponential token supply growth at a constant inflation rate to linear growth with a decreasing rate, fixing annual expansion at 120 million DOT split 85% to stakers and 15% to the Treasury. In December 2024 the Kusama canary network completed "The Spammening" stress test at roughly 143,000 transactions per second. DOT is used to purchase Coretime for secure computation and to reserve parachain identifiers for rollups.