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

# Module get_l1_to_l2_membership_witness

Module: `noir_aztec::oracle::get_l1_to_l2_membership_witness`

## Structs

- [UnsiloedNullifier](/aztec-nr-api/mainnet/noir_aztec/oracle/get_l1_to_l2_membership_witness/struct.UnsiloedNullifier.md): An unsiloed L1 to L2 message nullifier.

## Functions

- [get_l1_to_l2_membership_witness](/aztec-nr-api/mainnet/noir_aztec/oracle/get_l1_to_l2_membership_witness/fn.get_l1_to_l2_membership_witness.md): Returns the leaf index and sibling path of an entry in the L1 to L2 messaging tree, which can then be used to prove its existence.
- [try_get_l1_to_l2_membership_witness](/aztec-nr-api/mainnet/noir_aztec/oracle/get_l1_to_l2_membership_witness/fn.try_get_l1_to_l2_membership_witness.md): Returns the leaf index and sibling path of an entry in the L1 to L2 messaging tree, or `None` if there is no such entry.