snarkvm_ledger_block/header/metadata/
to_hash.rs

1// Copyright (c) 2019-2025 Provable Inc.
2// This file is part of the snarkVM library.
3
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at:
7
8// http://www.apache.org/licenses/LICENSE-2.0
9
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15
16use super::*;
17
18impl<N: Network> Metadata<N> {
19    /// Returns the metadata hash.
20    pub fn to_hash(&self) -> Result<Field<N>> {
21        // Construct the metadata bits (the last leaf in the Merkle tree).
22        let metadata_bits = self.to_bits_le(); // 696 bits
23        // Ensure the metadata bits is the correct size.
24        ensure!(metadata_bits.len() == 696, "Incorrect metadata size - {} bits", metadata_bits.len());
25        // Hash the metadata bits.
26        let metadata_hash = N::hash_bhp1024(&metadata_bits)?;
27        // Return the metadata hash.
28        Ok(metadata_hash)
29    }
30}