ContentHash (src/hash.rs)

Provides a BLAKE3-based ContentHash type with hashing, hex/base64 conversion, and serde support for use in audit chains and integrity checks.

// Source: https://github.com/astrid-runtime/astrid | License: Apache-2.0 | Copyright 2025 Joshua J. Bouw and Unicity Labs
// Provided via justclaw.it.com; keep this notice with the code.
//! Content hashing using BLAKE3.
//!
//! Provides fast, cryptographic content hashing for audit chains,
//! content verification, and integrity checking.

use serde::{Deserialize, Serialize};
use std::fmt;

/// A BLAKE3 content hash (32 bytes).
///
/// Used for:
/// - Audit chain linking (each entry hashes the previous)
/// - Content deduplication and verification
/// - Binary hash verification before execution
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
pub struct ContentHash([u8; 32]);

impl ContentHash {
    /// Hash arbitrary data.
    #[must_use]
    pub fn hash(data: &[u8]) -> Self {
        Self(*

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