Polkadot DOT

Polkadot was created by Gavin Wood — one of the most influential technologists in crypto history. Wood was Ethereum's co-founder and wrote its technical specification (Yellow Paper), invented the Solidity programming language for smart contracts, and built the Parity Ethereum client. In 2016 he published the Polkadot whitepaper. In 2017 Web3 Foundation raised $145 million in an ICO. Polkadot's genesis block launched in 2020. Wood also created Kusama — Polkadot's "canary" network for experiments.

Polkadot's architecture is built on two levels. Relay Chain is the main security chain. It does not execute smart contracts itself but provides consensus and finality for the entire network. Parachains are specialized blockchains connected to the Relay Chain. Each parachain runs in parallel with others, has its own governance, tokens and rules, but receives security from the shared Relay Chain. This allows hundreds of specialized blockchains to operate simultaneously, exchanging data through the XCM standard.

Parachain slots in Polkadot are limited (~100 initially). Projects competed for them through DOT-locking auctions: the more DOT locked by the community in a project's favor, the greater the chance of winning a slot (2-year lease). This created powerful incentives: projects offered their tokens to those who locked DOT. In 2021 the first auctions were won by Acala, Moonbeam, Astar. The model's downside: too high a barrier for small projects. Polkadot 2.0 transitions to a "coretime" model — renting compute time without rigid auctions.

Kusama (KSM) is Polkadot's "canary network." Technically identical to Polkadot but operates with real assets and without strict security requirements. Projects first test and launch on Kusama, then migrate to Polkadot. This allows discovering bugs before production deployment. Kusama has a separate KSM token and its own community. Governance on Kusama is more chaotic (fast votes, lower staking requirements), making the network an experimental playground. "Chaos protocol" is Kusama's unofficial slogan.

DOT is an inflationary token with no hard cap. The network generates new DOT to reward validators and nominators (10% annually of total supply, though the actual percentage for stakers is higher when staking is not full). In 2020 Polkadot conducted a redenomination: split tokens 100:1 (from 10M to 1B DOT). Important: when comparing historical prices this must be accounted for. High inflation is compensated by stakers receiving rewards while non-stakers get diluted.

Polkadot 2.0 is a protocol evolution announced in 2023. Key changes: replacing the parachain slot auction model with a "coretime" model (renting compute time in blocks, accessible to any project without multi-year auctions). JAM (Join-Accumulate Machine) is Gavin Wood's 2024 proposal for the next generation of Polkadot. JAM simplifies Relay Chain architecture and makes it more universal: not just a hub for parachains, but a universal compute environment capable of running any code, including ZK proofs and next-generation smart contracts.