nautechsystems/nautilus_trader · error

Deployment manifest digest must contain 32 hexadecimal bytes

Error message

Deployment manifest digest must contain 32 hexadecimal bytes

What it means

The configured `manifest_digest` must be a string that parses into a 32-byte B256 (64 hexadecimal characters). Parsing failure aborts validation with this message. The digest is the keccak256 commitment of the canonical manifest bytes and is used for integrity checks, so a malformed value cannot proceed.

Source

Thrown at crates/adapters/blockchain/src/rpc/verification.rs:1235

    );
    let checkpoint_hash = B256::from_str(&anchor.checkpoint_hash)
        .map_err(|_| anyhow::anyhow!("Chain checkpoint hash must contain 32 hexadecimal bytes"))?;
    anyhow::ensure!(
        checkpoint_hash != B256::ZERO,
        "Chain checkpoint hash must be nonzero"
    );
    anyhow::ensure!(
        anchor.max_head_skew_blocks != 0
            && anchor.max_head_age_secs != 0
            && anchor.max_future_drift_secs != 0,
        "Chain head skew, age, and future-drift limits must be nonzero"
    );
    anyhow::ensure!(
        !config.manifest_version.trim().is_empty(),
        "Deployment manifest version is required"
    );
    let manifest_digest = B256::from_str(&config.manifest_digest).map_err(|_| {
        anyhow::anyhow!("Deployment manifest digest must contain 32 hexadecimal bytes")
    })?;
    anyhow::ensure!(
        manifest_digest != B256::ZERO,
        "Deployment manifest digest must be nonzero"
    );
    let manifest = &config.deployment_manifest;
    anyhow::ensure!(
        manifest.version == config.manifest_version,
        "Deployment manifest version does not match its configured identity"
    );
    anyhow::ensure!(
        manifest.chain_id == anchor.chain_id && manifest.chain_name == anchor.chain_name,
        "Deployment manifest chain identity does not match the chain anchor"
    );
    let canonical_manifest = serde_json::to_vec(manifest)
        .map_err(|_| anyhow::anyhow!("Failed to serialize the deployment manifest"))?;
    anyhow::ensure!(
        keccak256(canonical_manifest) == manifest_digest,

View on GitHub (pinned to 18893faf8b)

Solutions

1. Recompute the digest as keccak256 over the canonical JSON serialization of the manifest and paste the full 64-hex-character value.
2. Verify the string is exactly 64 hex characters (optionally 0x-prefixed) with no whitespace.
3. Regenerate the manifest artifact if the original digest was produced by an older serializer version.

Example fix

// before
let config = DeploymentConfig { manifest_digest: "9f2cab".into(), ..config }; // truncated
// after
let config = DeploymentConfig { manifest_digest: "9f2c...ab01".into(), ..config }; // full 64 hex chars

fn digest_is_b256(s: &str) -> bool {
    let hex = s.strip_prefix("0x").unwrap_or(s);
    hex.len() == 64 && hex.chars().all(|c| c.is_ascii_hexdigit())
}
assert!(digest_is_b256(&config.manifest_digest));

fn parse_digest(s: &str) -> Option<B256> {
    B256::from_str(s).ok()
}

When it happens

Trigger: Validating a DeploymentConfig whose `manifest_digest` is empty, not hex, has an odd number of hex digits, or is not exactly 32 bytes.

Common situations: Digest truncated when copying from logs or CI output; missing 0x handling combined with strict parsing; a placeholder like "<digest>" left in a template; uppercase/whitespace artifacts from copy-paste.

Understand the failure class

Background: "Invalid ... format", "must be in format X", "does not look like a ..." — invalid argument format errors across CLI tools and libraries — this error's family across 17 libraries.

Related errors

• Pool identifier must start with '0x', was: {value}
• Pool identifier must be 42 chars (address) or 66 chars (pool
• Invalid hex characters in: {s}
• Invalid event signature for '{event_name}': expected {expect
• Invalid receipt log data

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/c297384dd45abc67. Report an issue: GitHub.