Poseidon

Built on the Solana blockchain, Poseidon is a private transaction layer designed to provide users with unlinkable, amount-hiding transfers. This zero-knowledge shielded transaction system operates trustlessly on Solana's blockchain, ensuring both privacy and decentralization without relying on centralized APIs.

Poseidon's technology is centered around a single on-chain program, a global Merkle tree, and client-side zero-knowledge proof generation. The protocol uses Groth16 zkSNARKs to provide private deposits, transfers, and withdrawals. The core components of Poseidon include the on-chain program, which enforces all protocol rules, and the zero-knowledge circuit, which checks hidden arithmetic and membership rules. The circuit ensures that every spend is consistent with the pool's accounting and guarantees that each note exists in the global commitment tree under a known root.

Poseidon's private transactions are facilitated through trade rooms, where users can engage in peer-to-peer token swaps with on-chain escrow protection. This allows for secure trading without revealing sensitive information. The protocol also enables two-phase withdrawals, which splits withdrawals into Prepare and Execute steps to allow users to generate heavy proofs off-chain and relayers to submit light execution transactions.

The Poseidon team has designed the protocol to be relayer-friendly, allowing third parties to submit transactions on behalf of users without learning sensitive information. This is achieved through a combination of zero-knowledge proofs and Merkle tree-based accounting. The Poseidon protocol is currently under maintenance, preparing for its mainnet launch.

Poseidon's unique value proposition lies in its ability to provide complete transaction privacy on the Solana blockchain. By breaking the link between deposits and withdrawals, Poseidon enables users to engage in private transactions without compromising their anonymity. With its robust architecture and innovative use of zero-knowledge proofs, Poseidon is poised to become a leading solution for financial institutions and individuals seeking secure and private transactions on Solana.