Useful Utility functions

The hadoopcryptoledger library has some useful utility methods that are relevant when working with cryptoledgers.

• Bitcoin
  • getTransactionHash to calculate the hash of a transaction (txid). This is useful to link addresses from transaction inputs to addresses for transaction output.
  • getTransactionHashSegwit to calculate the hash of a transaction including Segwit information (wtxid). This cannot be used to link transactions.
  • reverseByteArray to reverse the order of a given byte array. For example, if you want to search for a transaction hash provided by getTransactionHash in a public blockchain explorer (e.g. http://blockchain.info) then you need to reverse it
  • getPaymentDestination to get the payment destination described in the output script of a transaction
• Namecoin
  • getNameOperation - to get the type of Namecoin name operation (e.g. new, firstupdate or update) in a transaction. Note that not all Namecoin transactions contain name operations.
  • extractNamecoinField - in case the transaction contains a Namecoin name operation of type firstupdate or update then this method enables you to pull further information, such as domain name or identity (e.g. d/example) as well as the associated configuration (e.g. ip addresses, sub domains etc.).
• Ethereum
  • getTransactionHash - to get the transaction hash of an EthereumTransaction. You can search for this hash in Ethereum block explorers, such as https://etherscan.io/
  • getSendAddress - to get the sendaddress (from) for an EthereumTransaction. You need to specify the chainId (1 Frontier, 2 Morden, 3 Ropsten or any of the Altcoins) for EIP-155 transactions) You can search for this address in Ethereum block explorers, such as https://etherscan.io/
  • calculateChainId - to calculate the chainid of an EthereumTransaction