Merge JoinMarket-Org/joinmarket-clientserver#1659: Raise fallback fee rate from 10 sat/vB to 20 sat/vB

9c13180c13 Raise fallback fee rate from 10 sat/vB to 20 sat/vB (Kristaps Kaupe)

Pull request description:

  It's just current reality on mainnet, that's around what `bitcoin-cli estimatesmartfee 1008` (1 week confirmation target) returns.

ACKs for top commit:
  AdamISZ:
    utACK 9c13180c13

Tree-SHA512: 15057a92bc498c17d66141fb08e31c0e21f5a070f13de5bc99aa9236290e8d65c64ed2060239f616b4bb6b684e1abe498bb0976fe2b0c26ea61f601b6a6a4293

src/jmclient/blockchaininterface.py

@@ -253,7 +253,7 @@ class BlockchainInterface(ABC):
         """
 
         # default to use if fees cannot be estimated
-        fallback_fee = 10000
+        fallback_fee = 20000
 
         tx_fees_factor = abs(jm_single().config.getfloat('POLICY', 'tx_fees_factor'))