nautechsystems/nautilus_trader · error

Missing hash

Error message

Missing hash

What it means

transform_hypersync_block requires the block hash to construct the internal Block, since hash is the block's unique identifier. HyperSync returns hash as an optional hex value; when it is None the transform aborts with this error rather than creating an unidentifiable Block.

Source

Thrown at crates/adapters/blockchain/src/hypersync/transform.rs:59

    let gas_used = from_str_hex_to_u64(
        received_block
            .gas_used
            .ok_or_else(|| anyhow::anyhow!("Missing gas used"))?
            .encode_hex()
            .as_str(),
    )?;
    let timestamp = from_str_hex_to_u64(
        received_block
            .timestamp
            .ok_or_else(|| anyhow::anyhow!("Missing timestamp"))?
            .encode_hex()
            .as_str(),
    )?;

    let mut block = Block::new(
        received_block
            .hash
            .ok_or_else(|| anyhow::anyhow!("Missing hash"))?
            .to_string(),
        received_block
            .parent_hash
            .ok_or_else(|| anyhow::anyhow!("Missing parent hash"))?
            .to_string(),
        number,
        Ustr::from(
            received_block
                .miner
                .ok_or_else(|| anyhow::anyhow!("Missing miner"))?
                .to_string()
                .as_str(),
        ),
        gas_limit,
        gas_used,
        UnixNanos::new(timestamp * NANOSECONDS_IN_SECOND),
        Some(chain),
    );

View on GitHub (pinned to 18893faf8b)

Solutions

1. Add hash to the HyperSync query's selected block fields.
2. Verify the requested block range is fully indexed by HyperSync (pending blocks may lack hashes).
3. For synthetic/internal blocks only, synthesize a deterministic hash before transforming.
4. Upgrade hypersync-client if the schema no longer populates hash for your dataset version.

fn block_is_identifiable(b: &hypersync_client::simple_types::Block) -> bool {
    b.hash.is_some() && b.number.is_some()
}
// only transform blocks passing this check

fn has_hash(b: &hypersync_client::simple_types::Block) -> bool {
    matches!(b.hash, Some(_))
}

match transform_hypersync_block(chain, block) {
    Ok(b) => process(b),
    Err(e) if e.to_string().contains("Missing hash") => {
        tracing::warn!(block = ?block.number, "block missing hash; skipping");
    }
    Err(e) => return Err(e),
}

When it happens

Trigger: Calling pool_events_from_response where a HyperSync block in the response has hash == None — usually because the query did not project the hash field or the provider omitted it for the block.

Common situations: HyperSync queries with a narrowed column selection excluding hash; placeholder block records for ranges not yet indexed; manually constructed test fixtures missing the field.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

• Missing parent hash
• Missing transaction hash in log
• Missing transaction index in the log
• Missing log index in the log
• Missing block number in the log

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/f05e9e72a273f56f. Report an issue: GitHub.