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    use rayon::prelude::{IntoParallelRefIterator, IndexedParallelIterator, ParallelIterator};
    use chain::IndexedBlock;
    use network::Network;
    use error::Error;
    use verify_block::BlockVerifier;
    use verify_header::HeaderVerifier;
    use verify_transaction::TransactionVerifier;

    pub struct ChainVerifier<'a> {
    	pub block: BlockVerifier<'a>,
    	pub header: HeaderVerifier<'a>,
    	pub transactions: Vec<TransactionVerifier<'a>>,
    }

    impl<'a> ChainVerifier<'a> {
    	pub fn new(block: &'a IndexedBlock, network: Network, current_time: u32) -> Self {
    		trace!(target: "verification", "Block pre-verification {}", block.hash().to_reversed_str());
    		ChainVerifier {
    			block: BlockVerifier::new(block),
    			header: HeaderVerifier::new(&block.header, network, current_time),
    			transactions: block.transactions.iter().map(TransactionVerifier::new).collect(),
    		}
    	}

    	pub fn check(&self) -> Result<(), Error> {
    		try!(self.block.check());
    		try!(self.header.check());
    		try!(self.check_transactions());
    		Ok(())
    	}

    	fn check_transactions(&self) -> Result<(), Error> {
    		self.transactions.par_iter()
    			.enumerate()
    			.fold(|| Ok(()), |result, (index, tx)| result.and_then(|_| tx.check().map_err(|err| Error::Transaction(index, err))))
    			.reduce(|| Ok(()), |acc, check| acc.and(check))
    	}
    }

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