// instance of transaction builder
  let transactionBuilder = new RVNBOX.TransactionBuilder('ravencoin');

  transactionBuilder.hashTypes
  // { SIGHASH_ALL: 1,
  //   SIGHASH_NONE: 2,
  //   SIGHASH_SINGLE: 3,
  //   SIGHASH_ANYONECANPAY: 128,
  //   SIGHASH_RAVENCOIN_BIP143: 64 }

  transactionBuilder.hashTypes.SIGHASH_ALL
  // 1

  // also has a DEFAULT_SEQUENCE of 0xffffffff
  transactionBuilder.DEFAULT_SEQUENCE
  // 4294967295

  // txid of vout
  let txid = 'f7890915febe580920df2681d2bac0909ae89bd0cc1d3ed763e5eeba7f337f0e';
  // add input with txid and index of vout
  transactionBuilder.addInput(txid, 0);

  let originalAmount = 100000;
  let byteCount = RVNBOX.RavenCoin.getByteCount({ P2PKH: 1 }, { P2PKH: 1 });
  // amount to send to receiver. It's the original amount - 1 satoshi/byte for tx size
  let sendAmount = originalAmount - byteCount;
  // add output w/ address and amount to send
  transactionBuilder.addOutput('qpuax2tarq33f86wccwlx8ge7tad2wgvqgjqlwshpw', sendAmount);

  let originalAmount = 100000;
  // node of address which is going to spend utxo
  let hdnode = RVNBOX.HDNode.fromXPriv("xprvA3eaDg64MwDr72PVGJ7CkvshNAzCDRz7rn98sYrZVAtDSWCAmNGQhEQeCLDcnmcpSkfjhHevXmu4ZL8ZcT9D4vEbG8LpiToZETrHZttw9Yw");
  // keypair
  let keyPair = RVNBOX.HDNode.toKeyPair(hdnode);
  // empty redeemScript variable
  let redeemScript;
  // sign w/ keyPair
  transactionBuilder.sign(0, keyPair, redeemScript, transactionBuilder.hashTypes.SIGHASH_ALL, originalAmount);

  // build tx
  let tx = transactionBuilder.build();

  // output rawhex
  let hex = tx.toHex();
  // 02000000010e7f337fbaeee563d73e1dccd09be89a90c0bad28126df200958befe150989f7000000006b48304502210085b8eb33f3981315bbe39c6810d0311c6cb39504914300ecd952cab8353222e202200ec95797c06ba8c9b15d59ab80e63300cb2371f67b3969d0b502d0fed733fbed4121025c85a571619e60fed412de0356b4e28f4f3670ab0c2b899dfe60e69aaa6cd4c0ffffffff01a6370000000000001976a91479d3297d1823149f4ec61df31d19f2fad5390c0288ac00000000
  // sendRawTransaction to running RVN node
  RVNBOX.RawTransactions.sendRawTransaction(hex).then((result) => { console.log(result); }, (err) => { console.log(err); });
  // dfe54ec45c6fa2fa85b76d113de85b169d36902eaf6700f1cca21eed1392814b

  // encode some text as a buffer
  let buf = new Buffer('#RVNForEveryone');
  // create array w/ OP_RETURN code and text buffer and encode
  let data = RVNBOX.Script.encode([
  RVNBOX.Script.opcodes.OP_RETURN,
  buf
  ])
  // add encoded data as output and send 0 satoshis
  transactionBuilder.addOutput(data, 0)

  // later when you decode the raw hex of the tx you'll see this scriptPubKey
  "OP_RETURN 23424348466f7245766572796f6e65"

  // you can use RVNBOX to decode it to the original text
  let fromAsm = RVNBOX.Script.fromASM("OP_RETURN 23424348466f7245766572796f6e65")
  let decoded = RVNBOX.Script.decode(fromAsm)
  decoded[1].toString('ascii')
  // #RVNForEveryone

  let transactionBuilder = new RVNBOX.TransactionBuilder();
  let r = Buffer.from('1ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777', 'hex');
  let s = Buffer.from('29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex');
  transactionBuilder.bip66.encode(r, s);
  //

  let transactionBuilder = new RVNBOX.TransactionBuilder();
  let signature = new Buffer.from('304302201ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777021f29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex');
  transactionBuilder.bip66.decode(signature);
  // { r:
  //  ,
  // s:
  //   }

  let transactionBuilder = new RVNBOX.TransactionBuilder();
  let DER = '3044022029db2d5f4e1dcc04e19266cce3cb135865784c62ab653b307f0e0bb744f5c2aa022000a97f5826912cac8b44d9f577a26f169a2f8db781f2ddb7de2bc886e93b6844';
  let buffer = Buffer.from(DER, 'hex')
  transactionBuilder.bip66.check(buffer);
  // true

  let transactionBuilder = new RVNBOX.TransactionBuilder();
  transactionBuilder.bip68.encode({ seconds: 2048 })
  // 4194308
  transactionBuilder.bip68.encode({ blocks: 52 })
  // 52

  let transactionBuilder = new RVNBOX.TransactionBuilder();
  transactionBuilder.bip68.decode(0x03ffffff)
  // { seconds: 33553920 }
  transactionBuilder.bip68.decode(0x0100fffe)
  // { blocks: 65534 }