use brace expansion

Author: Lucien Grondin

bitcoin.sh

@@ -306,7 +306,7 @@ bech32()
  fi
 
 polymod() {
- local -ai generator=(0x3b6a57b2 0x26508e6d 0x1ea119fa 0x3d4233dd 0x2a1462b3)
+ local -ai generator=(0x{3b6a57b2,26508e6d,1ea119fa,3d4233dd,2a1462b3})
  local -i chk=1 value
  for value
  do