> Aztec.nr API reference, v6.0.0 (mainnet and testnet). Index: https://docs.aztec.network/aztec-nr-api/v6.0.0/llms.txt

# Function public_data_storage_read

Module: `noir_aztec::protocol::data`

```rust
pub fn public_data_storage_read(
    public_data_tree_root: Field,
    public_data_leaf_slot: Field,
    witness: MembershipWitness<40>,
    leaf_preimage: PublicDataTreeLeafPreimage,
) -> Field
```

Read the value from public storage at the given `leaf_slot`.

Parameters:

- `public_data_tree_root`: The root of the public data tree.
- `public_data_leaf_slot`: The slot of the leaf in the public data tree.
- `witness`: A hint to prove that the `leaf_preimage` exists in the tree.

The slot could either exist (has been initialized) in the tree or not:

- If it's in the tree, `leaf_preimage` should be the preimage for the slot.
- If it's not in the tree, `leaf_preimage` should be the preimage for the low leaf of the slot.

Returns:

- `Field`: The value read from the public data tree.