# Teller

The Teller contract stores deposited funds and serves as the entry-point for processing bundles of operations. More specifically, the Teller is in charge of two things: non-custodially holding user funds and verifying JoinSplit proofs when processing a bundle of operations. After verifying the JoinSplit proofs, actual execution of the operations is delegated to the Handler contract.

**Storing Funds**

When a deposit is completed from the Deposit Manager, the Teller receives the deposit assets. It also calls the Handler contract (see next section) to insert a new note into the commitment tree corresponding to the deposit. Later on, when the Handler needs to take up assets for executing an operation, it will call the Teller's `requestAssets` method to gather the funds needed during operation execution.

**Entrypoint / Validating Proofs** 

When a bundler calls `processBundle` on the Teller, the Teller will batch-verify all joinsplit proofs contained within the bundle to amortize gas costs. If the batched proof verification passes, it will pass operations to the Handler contract one-by-one for processing and execution.