confirmations: 0,
          difficulty: 0.0,
          hash: block_hash,
          height,
          median_time: None,
          merkle_root: TxMerkleNode::all_zeros(),
          n_tx: 0,
          next_block_hash: None,
          nonce: 0,
          previous_block_hash: None,
          time: 0,
          version: Version::ONE,
          version_hex: Some(vec![0, 0, 0, 0]),
        })
        .unwrap(),
      )
    } else {
      match self.state().blocks.get(&block_hash) {
        Some(block) => Ok(serde_json::to_value(hex::encode(serialize(&block.header))).unwrap()),
        None => Err(Self::not_found()),
      }
    }
  }

  fn get_block(
    &self,
    block_hash: BlockHash,
    verbosity: u64,
  ) -> Result<String, jsonrpc_core::Error> {
    assert_eq!(verbosity, 0, "Verbosity level {verbosity} is unsupported");
    match self.state().blocks.get(&block_hash) {
      Some(block) => Ok(hex::encode(serialize(block))),
      None => Err(Self::not_found()),
    }
  }

  fn get_block_count(&self) -> Result<u64, jsonrpc_core::Error> {