old_contents: import json
  
  try:
      from urllib2 import urlopen
  except ImportError:
      from urllib.request import urlopen
  
  from pycoin.serialize import h2b
  from pycoin.tx import Spendable
  
  
  class ChainSoProvider(object):
      def __init__(self, netcode="BTC"):
          NETWORK_PATHS = {
              "BTC" : "BTC",
              "XTN" : "BTCTEST"
          }
  
          self.network_path = NETWORK_PATHS.get(netcode)
  
      def base_url(self, method, args):
          return "https://chain.so/api/v2/%s/%s/%s" % (method, self.network_path, args)
  
      def unspents_for_address(self, address):
          """
          Return a list of Spendable objects for the
          given bitcoin address.
          """
          spendables = []
          r = json.loads(urlopen(self.base_url('get_tx_unspent', address)).read().decode("utf8"))
  
          for u in r['data']['txs']:
              coin_value = int (float (u['value']) * 100000000)
              script = h2b(u["script_hex"])
              previous_hash = h2b(u["txid"])
              previous_index = u["output_no"]
              spendables.append(Spendable(coin_value, script, previous_hash, previous_index))
  
          return spendables
  
new_contents: import json
  
  try:
      from urllib2 import urlopen
  except ImportError:
      from urllib.request import urlopen
  
  from pycoin.serialize import h2b, h2b_rev
  from pycoin.tx import Spendable
  
  
  class ChainSoProvider(object):
      def __init__(self, netcode="BTC"):
          NETWORK_PATHS = {
              "BTC" : "BTC",
              "XTN" : "BTCTEST"
          }
  
          self.network_path = NETWORK_PATHS.get(netcode)
  
      def base_url(self, method, args):
          return "https://chain.so/api/v2/%s/%s/%s" % (method, self.network_path, args)
  
      def unspents_for_address(self, address):
          """
          Return a list of Spendable objects for the
          given bitcoin address.
          """
          spendables = []
          r = json.loads(urlopen(self.base_url('get_tx_unspent', address)).read().decode("utf8"))
  
          for u in r['data']['txs']:
              coin_value = int (float (u['value']) * 100000000)
              script = h2b(u["script_hex"])
              previous_hash = h2b_rev(u["txid"])
              previous_index = u["output_no"]
              spendables.append(Spendable(coin_value, script, previous_hash, previous_index))
  
          return spendables
  
subject: Fix unspents_for_address for chain_so service provider.