An entry in chainparams for testnet4 support. The BIP70 name given as…

… testnet4 to correspond with chaininfo value.

bitcoin/chainparams.c

@@ -137,6 +137,31 @@ const struct chainparams networks[] = {
      .bip32_key_version = {.bip32_pubkey_version = BIP32_VER_TEST_PUBLIC,
 			   .bip32_privkey_version = BIP32_VER_TEST_PRIVATE},
      .is_elements = false},
+    {.network_name = "testnet4",
+     .onchain_hrp = "tb",
+     .lightning_hrp = "tb",
+     .bip70_name = "testnet4",
+     .genesis_blockhash = {{{.u.u8 = {0x43, 0xf0, 0x8b, 0xda, 0xb0, 0x50, 0xe3,
+				      0x5b, 0x56, 0x7c, 0x86, 0x4b, 0x91, 0xf4,
+				      0x7f, 0x50, 0xae, 0x72, 0x5a, 0xe2, 0xde,
+				      0x53, 0xbc, 0xfb, 0xba, 0xf2, 0x84, 0xda, 
+				      0x00, 0x00, 0x00, 0x00}}}},                        
+     .rpc_port = 18332,
+     .ln_port = 19735,
+     .cli = "bitcoin-cli",
+     .cli_args = "-testnet4",
+     .cli_min_supported_version = 150000,
+     .dust_limit = { 546 },
+     .max_funding = AMOUNT_SAT_INIT((1 << 24) - 1),
+     .max_payment = AMOUNT_MSAT_INIT(0xFFFFFFFFULL),
+     .max_supply = AMOUNT_SAT_INIT(2100000000000000),
+     .p2pkh_version = 111,
+     .p2sh_version = 196,
+     .testnet = true,
+     .fee_asset_tag = NULL,
+     .bip32_key_version = {.bip32_pubkey_version = BIP32_VER_TEST_PUBLIC,
+			   .bip32_privkey_version = BIP32_VER_TEST_PRIVATE},
+     .is_elements = false},     
     {.network_name = "litecoin",
      .onchain_hrp = "ltc",
      .lightning_hrp = "ltc",