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Polkadot

Grade
A-

Nominated PoS with a large validator set and fully on-chain governance.

L1NPoS
Type
L1 · NPoS
How it works
Nominated Proof-of-Stake elects a broad validator set each era; OpenGov lets DOT holders control upgrades and treasury entirely on-chain, with no foundation veto.
Nakamoto coefficient
50+
Node / validator set
~300–600 validators
Client diversity
Multiple implementations (Polkadot SDK)
Governance
Fully on-chain (OpenGov)
Key risk
Nominator concentration

Assessment

Polkadot pairs a high Nakamoto coefficient with the most complete on-chain governance of any major L1 — upgrades and treasury are decided by token holders without a foundation override. Validator/nominator concentration is the main thing to watch.

Decentralized here

  • High Nakamoto coefficient (50+)
  • Fully on-chain governance (OpenGov)
  • Broad, rotating validator set
  • No foundation veto on upgrades

Centralization vectors

  • Nominator stake can concentrate
  • Complex multi-chain security model
  • Smaller ecosystem mindshare
A-

Verdict

Elite on governance decentralization; strong on consensus.

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Grade as of June 2026; an opinionated synthesis of cited public metrics (Chainspect / Nakaflow (Nakamoto), L2BEAT (stages), clientdiversity.org — 2026). Figures shift — see methodology.

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