Field Notes

entity

Solana

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Solana is a high-throughput blockchain designed to match the performance of a single node while remaining decentralized. It combines proof-of-history (PoH), a cryptographic clock that timestamps and orders transactions, with a proof-of-stake consensus called Tower BFT.

Design

Solana’s distinctive mechanism is PoH: a sequential SHA-256 hashing chain that acts as a verifiable clock. The current leader mixes user transactions into PoH ticks and publishes a block every ~400 milliseconds. Other validators can verify the ordering without redoing the full hash chain in real time, which shrinks the coordination problem from global ordering to validating a single proposed block.

PoH is not a consensus mechanism. It helps order events; stake-weighted votes using Tower BFT decide which fork is canonical. Tower BFT uses escalating lockouts: each consecutive vote on the same fork doubles a lockout period, making it economically irrational to reverse deep history.

Confirmation levels

Solana exposes three commitment levels:

  • Processed: the node has seen the block; may still fork.
  • Confirmed: a supermajority of stake has voted; rollback unlikely.
  • Finalized: maximum lockout depth reached on this fork.

User-visible confirmations arrive in under a second. Full finality normally completes within about 13 seconds, but the demanding validator infrastructure has produced historical liveness incidents in which finalized funds were not rewritten but the chain halted until a coordinated restart.

Privacy is low by default: accounts, programs, and transfers are public.

Cryptocurrency design comparison places Solana’s design beside Bitcoin, Monero, Ethereum, and Zcash.

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