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

# Global DOM_SEP__INBOX_ROLLING_HASH

Module: `noir_aztec::protocol::constants`

```rust
pub global DOM_SEP__INBOX_ROLLING_HASH: u32;
```

Domain separator for the Inbox rolling sha256 chain over L1 to L2 message leaves.

Prefixed to every link's sha256 preimage so a chain link cannot be reinterpreted as an untagged two-field sha256 hash, in particular the `out_hash` merkle node hash, which absorbs the same 64-byte two-field preimage shape.