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Private transfers aim to hide who is transacting. On Starknet, the transaction sender is visible—so users often submit through a paymaster service.

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Flow

  1. User builds proof + server-side actions and sends them to the paymaster.
  2. Paymaster broadcasts the transaction from its account and pays fee in ETH/strk.
  3. User includes a Withdraw (or similar) in the same transaction to send fee reimbursement from the pool to the paymaster’s public address.
On-chain, observers see the paymaster as sender; they do not see the user’s Starknet address as the transaction origin.

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Trust model

  • Paymaster learns IP and whatever the client sends; it should not learn more than necessary if the payload is minimal.
  • Choose paymasters with clear privacy and retention policies.
Related: Security, Transaction flow.