old_contents: from binascii import hexlify
  from eth_utils import denoms, int_to_big_endian
  
  INITIAL_PORT = 38647
  
  RPC_CACHE_TTL = 600
  CACHE_TTL = 60
  ESTIMATED_BLOCK_TIME = 7
  GAS_LIMIT = 10 * 10**6
  GAS_LIMIT_HEX = '0x' + hexlify(int_to_big_endian(GAS_LIMIT)).decode('utf-8')
  GAS_PRICE = denoms.shannon * 20
  
  DEFAULT_TRANSPORT_RETRIES_BEFORE_BACKOFF = 5
  DEFAULT_TRANSPORT_THROTTLE_CAPACITY = 10.
  DEFAULT_TRANSPORT_THROTTLE_FILL_RATE = 10.
  DEFAULT_TRANSPORT_RETRY_INTERVAL = 1.
  
  DEFAULT_REVEAL_TIMEOUT = 10
  DEFAULT_SETTLE_TIMEOUT = DEFAULT_REVEAL_TIMEOUT * 9
  DEFAULT_RETRY_TIMEOUT = 0.5
  DEFAULT_POLL_TIMEOUT = 180
  DEFAULT_JOINABLE_FUNDS_TARGET = 0.4
  DEFAULT_INITIAL_CHANNEL_TARGET = 3
  DEFAULT_WAIT_FOR_SETTLE = True
  DEFAULT_NUMBER_OF_CONFIRMATIONS_BLOCK = 5
  
  DEFAULT_NAT_KEEPALIVE_RETRIES = 5
  DEFAULT_NAT_KEEPALIVE_TIMEOUT = 5
  DEFAULT_NAT_INVITATION_TIMEOUT = 15
  
  DEFAULT_SHUTDOWN_TIMEOUT = 2
  
  ORACLE_BLOCKNUMBER_DRIFT_TOLERANCE = 3
  ETHERSCAN_API = 'https://{network}.etherscan.io/api?module=proxy&action={action}'
  
  EXPECTED_CONTRACTS_VERSION = '0.3.0'
  
new_contents: from eth_utils import denoms, to_hex
  
  INITIAL_PORT = 38647
  
  RPC_CACHE_TTL = 600
  CACHE_TTL = 60
  GAS_LIMIT = 10 * 10**6
  GAS_LIMIT_HEX = to_hex(GAS_LIMIT)
  GAS_PRICE = denoms.shannon * 20
  
  DEFAULT_TRANSPORT_RETRIES_BEFORE_BACKOFF = 5
  DEFAULT_TRANSPORT_THROTTLE_CAPACITY = 10.
  DEFAULT_TRANSPORT_THROTTLE_FILL_RATE = 10.
  DEFAULT_TRANSPORT_RETRY_INTERVAL = 1.
  
  DEFAULT_REVEAL_TIMEOUT = 10
  DEFAULT_SETTLE_TIMEOUT = 500
  DEFAULT_RETRY_TIMEOUT = 0.5
  DEFAULT_POLL_TIMEOUT = 180
  DEFAULT_JOINABLE_FUNDS_TARGET = 0.4
  DEFAULT_INITIAL_CHANNEL_TARGET = 3
  DEFAULT_WAIT_FOR_SETTLE = True
  DEFAULT_NUMBER_OF_CONFIRMATIONS_BLOCK = 5
  
  DEFAULT_NAT_KEEPALIVE_RETRIES = 5
  DEFAULT_NAT_KEEPALIVE_TIMEOUT = 5
  DEFAULT_NAT_INVITATION_TIMEOUT = 15
  
  DEFAULT_SHUTDOWN_TIMEOUT = 2
  
  ORACLE_BLOCKNUMBER_DRIFT_TOLERANCE = 3
  ETHERSCAN_API = 'https://{network}.etherscan.io/api?module=proxy&action={action}'
  
  EXPECTED_CONTRACTS_VERSION = '0.3.0'
  
subject: Update default settlement period