add signet support

electrum/commands.py

@@ -1400,6 +1400,7 @@ def add_global_options(parser):
     group.add_argument("--testnet", action="store_true", dest="testnet", default=False, help="Use Testnet")
     group.add_argument("--regtest", action="store_true", dest="regtest", default=False, help="Use Regtest")
     group.add_argument("--simnet", action="store_true", dest="simnet", default=False, help="Use Simnet")
+    group.add_argument("--signet", action="store_true", dest="signet", default=False, help="Use Signet")
     group.add_argument("-o", "--offline", action="store_true", dest="offline", default=False, help="Run offline")
 
 def add_wallet_option(parser):

electrum/constants.py

@@ -60,6 +60,7 @@ class AbstractNet:
 
 class BitcoinMainnet(AbstractNet):
 
+    NET_NAME = "mainnet"
     TESTNET = False
     WIF_PREFIX = 0x80
     ADDRTYPE_P2PKH = 0
@@ -98,6 +99,7 @@ class BitcoinMainnet(AbstractNet):
 
 class BitcoinTestnet(AbstractNet):
 
+    NET_NAME = "testnet"
     TESTNET = True
     WIF_PREFIX = 0xef
     ADDRTYPE_P2PKH = 111
@@ -134,6 +136,7 @@ class BitcoinTestnet(AbstractNet):
 
 class BitcoinRegtest(BitcoinTestnet):
 
+    NET_NAME = "regtest"
     SEGWIT_HRP = "bcrt"
     GENESIS = "0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206"
     DEFAULT_SERVERS = read_json('servers_regtest.json', {})
@@ -143,6 +146,7 @@ class BitcoinRegtest(BitcoinTestnet):
 
 class BitcoinSimnet(BitcoinTestnet):
 
+    NET_NAME = "simnet"
     WIF_PREFIX = 0x64
     ADDRTYPE_P2PKH = 0x3f
     ADDRTYPE_P2SH = 0x7b
@@ -153,9 +157,22 @@ class BitcoinSimnet(BitcoinTestnet):
     LN_DNS_SEEDS = []
 
 
+class BitcoinSignet(BitcoinTestnet):
+
+    NET_NAME = "signet"
+    GENESIS = "00000008819873e925422c1ff0f99f7cc9bbb232af63a077a480a3633bee1ef6"
+    DEFAULT_SERVERS = read_json('servers_signet.json', {})
+    CHECKPOINTS = []
+    LN_DNS_SEEDS = []
+
+
 # don't import net directly, import the module instead (so that net is singleton)
 net = BitcoinMainnet
 
+def set_signet():
+    global net
+    net = BitcoinSignet
+
 def set_simnet():
     global net
     net = BitcoinSimnet
@@ -168,7 +185,6 @@ def set_testnet():
     global net
     net = BitcoinTestnet
 
-
 def set_regtest():
     global net
     net = BitcoinRegtest

electrum/gui/qt/main_window.py

@@ -540,7 +540,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             self.setGeometry(100, 100, 840, 400)
 
     def watching_only_changed(self):
-        name = "Electrum Testnet" if constants.net.TESTNET else "Electrum"
+        name = "Electrum"
+        if constants.net.TESTNET:
+            name += " " + constants.net.NET_NAME.capitalize()
         title = '%s %s  -  %s' % (name, ELECTRUM_VERSION,
                                         self.wallet.basename())
         extra = [self.wallet.db.get('wallet_type', '?')]

electrum/lnaddr.py

@@ -178,6 +178,9 @@ def pull_tagged(stream):
     return (CHARSET[tag], stream.read(length * 5), stream)
 
 def lnencode(addr: 'LnAddr', privkey) -> str:
+    # see https://github.com/lightningnetwork/lightning-rfc/pull/844
+    if constants.net.NET_NAME == "signet":
+        addr.currency += "s"
     if addr.amount:
         amount = addr.currency + shorten_amount(addr.amount)
     else:
@@ -366,6 +369,9 @@ class SerializableKey:
 def lndecode(invoice: str, *, verbose=False, expected_hrp=None) -> LnAddr:
     if expected_hrp is None:
         expected_hrp = constants.net.SEGWIT_HRP
+    # see https://github.com/lightningnetwork/lightning-rfc/pull/844
+    if constants.net.NET_NAME == "signet":
+        expected_hrp += "s"
     decoded_bech32 = bech32_decode(invoice, ignore_long_length=True)
     hrp = decoded_bech32.hrp
     data = decoded_bech32.data

electrum/servers_signet.json

@@ -0,0 +1,14 @@
+{
+    "127.0.0.1": {
+        "pruning": "-",
+        "s": "51002",
+        "t": "51001",
+        "version": "1.2"
+    },
+    "signet-electrumx.wakiyamap.dev": {
+        "pruning": "-",
+        "s": "50002",
+        "t": "50001",
+        "version": "1.4"
+    }
+}

electrum/simple_config.py

@@ -128,6 +128,9 @@ class SimpleConfig(Logger):
         elif self.get('simnet'):
             path = os.path.join(path, 'simnet')
             make_dir(path, allow_symlink=False)
+        elif self.get('signet'):
+            path = os.path.join(path, 'signet')
+            make_dir(path, allow_symlink=False)
 
         self.logger.info(f"electrum directory {path}")
         return path

electrum/trampoline.py

@@ -63,11 +63,17 @@ TRAMPOLINE_NODES_TESTNET = {
     'endurance': LNPeerAddr(host='34.250.234.192', port=9735, pubkey=bytes.fromhex('03933884aaf1d6b108397e5efe5c86bcf2d8ca8d2f700eda99db9214fc2712b134')),
 }
 
+TRAMPOLINE_NODES_SIGNET = {
+    'wakiyamap.dev': LNPeerAddr(host='signet-electrumx.wakiyamap.dev', port=9735, pubkey=bytes.fromhex('02dadf6c28f3284d591cd2a4189d1530c1ff82c07059ebea150a33ab76e7364b4a')),
+}
+
 def hardcoded_trampoline_nodes():
-    if constants.net in (constants.BitcoinMainnet,):
+    if constants.net.NET_NAME == "mainnet":
         return TRAMPOLINE_NODES_MAINNET
-    if constants.net in (constants.BitcoinTestnet,):
+    if constants.net.NET_NAME == "testnet":
         return TRAMPOLINE_NODES_TESTNET
+    if constants.net.NET_NAME == "signet":
+        return TRAMPOLINE_NODES_SIGNET
     return {}
 
 def trampolines_by_id():

electrum/util.py

@@ -804,12 +804,29 @@ testnet_block_explorers = {
                        {'tx': 'tx/', 'addr': 'address/'}),
 }
 
+signet_block_explorers = {
+    'bc-2.jp': ('https://explorer.bc-2.jp/',
+                        {'tx': 'tx/', 'addr': 'address/'}),
+    'mempool.space': ('https://mempool.space/signet/',
+                        {'tx': 'tx/', 'addr': 'address/'}),
+    'bitcoinexplorer.org': ('https://signet.bitcoinexplorer.org/',
+                       {'tx': 'tx/', 'addr': 'address/'}),
+    'wakiyamap.dev': ('https://signet-explorer.wakiyamap.dev/',
+                       {'tx': 'tx/', 'addr': 'address/'}),
+    'system default': ('blockchain:/',
+                       {'tx': 'tx/', 'addr': 'address/'}),
+}
+
 _block_explorer_default_api_loc = {'tx': 'tx/', 'addr': 'address/'}
 
 
 def block_explorer_info():
     from . import constants
-    return mainnet_block_explorers if not constants.net.TESTNET else testnet_block_explorers
+    if constants.net.NET_NAME == "testnet":
+        return testnet_block_explorers
+    elif constants.net.NET_NAME == "signet":
+        return signet_block_explorers
+    return mainnet_block_explorers
 
 
 def block_explorer(config: 'SimpleConfig') -> Optional[str]:

run_electrum

@@ -366,6 +366,8 @@ def main():
         constants.set_regtest()
     elif config.get('simnet'):
         constants.set_simnet()
+    elif config.get('signet'):
+        constants.set_signet()
 
     cmdname = config.get('cmd')