Whitelist script addresses on testnet when wallet support is missing, and blacklist bech32 addresses.

src/bitcoin.c

@@ -65,11 +65,16 @@ bool validate_address(connsock_t *cs, const char *address, bool *script, bool *s
 	ret = true;
 	tmp_val = json_object_get(res_val, "isscript");
 	if (unlikely(!tmp_val)) {
-		/* All recent bitcoinds should support this, if not, look for
-		 * a 3x address to at least support it on mainnet */
+		/* All recent bitcoinds with wallet support built in should
+		 * support this, if not, look for addresses the braindead way
+		 * to tell if it's a script address. */
 		LOGDEBUG("No isscript support from bitcoind");
-		if (address[0] == '3')
+		if (address[0] == '3' || address[0] == '2')
 			*script = true;
+		/* Now look to see this isn't a bech32: We can't support
+		 * bech32 without knowing if it's a pubkey or a script */
+		else if (address[0] != '1' && address[0] != 'm')
+			ret = false;
 		goto out;
 	}
 	*script = json_is_true(tmp_val);