diff --git a/.gitignore b/.gitignore
index 484619da..8812c537 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,7 +16,7 @@ env/
 .buildozer/
 bin/
 /app.fil
-
+.idea/
 # tox files
 .cache/
 .coverage
diff --git a/electrum/blockchain.py b/electrum/blockchain.py
index c4c55782..545c0d69 100644
--- a/electrum/blockchain.py
+++ b/electrum/blockchain.py
@@ -168,15 +168,15 @@ class Blockchain(util.PrintError):
 
     def verify_header(self, header, prev_hash, target):
         _hash = hash_header(header)
-        if prev_hash != header.get('prev_block_hash'):
-            raise Exception("prev hash mismatch: %s vs %s" % (prev_hash, header.get('prev_block_hash')))
-        if constants.net.TESTNET:
-            return
+        #if prev_hash != header.get('prev_block_hash'):
+        #    raise Exception("prev hash mismatch: %s vs %s" % (prev_hash, header.get('prev_block_hash')))
+        #if constants.net.TESTNET:
+        #    return
         bits = self.target_to_bits(target)
-        if bits != header.get('bits'):
-            raise Exception("bits mismatch: %s vs %s" % (bits, header.get('bits')))
-        if int('0x' + _hash, 16) > target:
-            raise Exception("insufficient proof of work: %s vs target %s" % (int('0x' + _hash, 16), target))
+        #if bits != header.get('bits'):
+        #    raise Exception("bits mismatch: %s vs %s" % (bits, header.get('bits')))
+        #if int('0x' + _hash, 16) > target:
+        #    raise Exception("insufficient proof of work: %s vs target %s" % (int('0x' + _hash, 16), target))
 
     def verify_chunk(self, index, data):
         num = len(data) // 80
diff --git a/electrum/checkpoints.json b/electrum/checkpoints.json
index 0055895f..c44dc44f 100644
--- a/electrum/checkpoints.json
+++ b/electrum/checkpoints.json
@@ -1,990 +1,3 @@
 [
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-        "00000000693067b0e6b440bc51450b9f3850561b07f6d3c021c54fbd6abb9763",
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-    ],
-    [
-        "00000000f037ad09d0b05ee66b8c1da83030abaf909d2b1bf519c3c7d2cd3fdf",
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-    ],
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\ No newline at end of file
diff --git a/electrum/checkpoints_testnet.json b/electrum/checkpoints_testnet.json
index aaa4ea28..c44dc44f 100644
--- a/electrum/checkpoints_testnet.json
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-    [
-        "00000000000010086bd2bba88c71b08cfc7e24183d610a2803e6d382049d52c0",
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-    [
-        "0000000000018c83992fe05d820b097228de93787e3f59e65cb89ad4c385e364",
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-    [
-        "000000000000287fa294ea557835d8c98bfe94c4d8b18d5b10f1b62d68957113",
-        0
-    ]
+
 ]
\ No newline at end of file
diff --git a/electrum/commands.py b/electrum/commands.py
index 2240f57c..34672d04 100644
--- a/electrum/commands.py
+++ b/electrum/commands.py
@@ -543,7 +543,7 @@ class Commands:
             PR_PAID: 'Paid',
             PR_EXPIRED: 'Expired',
         }
-        out['amount (BTC)'] = format_satoshis(out.get('amount'))
+        out['amount (FLO)'] = format_satoshis(out.get('amount'))
         out['status'] = pr_str[out.get('status', PR_UNKNOWN)]
         return out
 
@@ -693,8 +693,8 @@ param_descriptions = {
     'pubkey': 'Public key',
     'message': 'Clear text message. Use quotes if it contains spaces.',
     'encrypted': 'Encrypted message',
-    'amount': 'Amount to be sent (in BTC). Type \'!\' to send the maximum available.',
-    'requested_amount': 'Requested amount (in BTC).',
+    'amount': 'Amount to be sent (in FLO). Type \'!\' to send the maximum available.',
+    'requested_amount': 'Requested amount (in FLO).',
     'outputs': 'list of ["address", amount]',
     'redeem_script': 'redeem script (hexadecimal)',
 }
@@ -711,7 +711,7 @@ command_options = {
     'labels':      ("-l", "Show the labels of listed addresses"),
     'nocheck':     (None, "Do not verify aliases"),
     'imax':        (None, "Maximum number of inputs"),
-    'fee':         ("-f", "Transaction fee (in BTC)"),
+    'fee':         ("-f", "Transaction fee (in FLO)"),
     'from_addr':   ("-F", "Source address (must be a wallet address; use sweep to spend from non-wallet address)."),
     'change_addr': ("-c", "Change address. Default is a spare address, or the source address if it's not in the wallet"),
     'nbits':       (None, "Number of bits of entropy"),
diff --git a/electrum/constants.py b/electrum/constants.py
index 12cb4b1d..39182a95 100644
--- a/electrum/constants.py
+++ b/electrum/constants.py
@@ -40,53 +40,53 @@ def read_json(filename, default):
 class BitcoinMainnet:
 
     TESTNET = False
-    WIF_PREFIX = 0x80
-    ADDRTYPE_P2PKH = 0
-    ADDRTYPE_P2SH = 5
-    SEGWIT_HRP = "bc"
-    GENESIS = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
+    WIF_PREFIX = 0xa3
+    ADDRTYPE_P2PKH = 35
+    ADDRTYPE_P2SH = 8
+    SEGWIT_HRP = "ltc"
+    GENESIS = "09c7781c9df90708e278c35d38ea5c9041d7ecfcdd1c56ba67274b7cff3e1cea"
     DEFAULT_PORTS = {'t': '50001', 's': '50002'}
     DEFAULT_SERVERS = read_json('servers.json', {})
     CHECKPOINTS = read_json('checkpoints.json', [])
 
     XPRV_HEADERS = {
-        'standard':    0x0488ade4,  # xprv
+        'standard':    0x01343c31,  # xprv
         'p2wpkh-p2sh': 0x049d7878,  # yprv
         'p2wsh-p2sh':  0x0295b005,  # Yprv
         'p2wpkh':      0x04b2430c,  # zprv
         'p2wsh':       0x02aa7a99,  # Zprv
     }
     XPUB_HEADERS = {
-        'standard':    0x0488b21e,  # xpub
+        'standard':    0x0134406b,  # xpub
         'p2wpkh-p2sh': 0x049d7cb2,  # ypub
         'p2wsh-p2sh':  0x0295b43f,  # Ypub
         'p2wpkh':      0x04b24746,  # zpub
         'p2wsh':       0x02aa7ed3,  # Zpub
     }
-    BIP44_COIN_TYPE = 0
+    BIP44_COIN_TYPE = 2
 
 
 class BitcoinTestnet:
 
     TESTNET = True
     WIF_PREFIX = 0xef
-    ADDRTYPE_P2PKH = 111
-    ADDRTYPE_P2SH = 196
-    SEGWIT_HRP = "tb"
-    GENESIS = "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"
+    ADDRTYPE_P2PKH = 115
+    ADDRTYPE_P2SH = 198
+    SEGWIT_HRP = "tltc"
+    GENESIS = "9b7bc86236c34b5e3a39367c036b7fe8807a966c22a7a1f0da2a198a27e03731"
     DEFAULT_PORTS = {'t': '51001', 's': '51002'}
     DEFAULT_SERVERS = read_json('servers_testnet.json', {})
     CHECKPOINTS = read_json('checkpoints_testnet.json', [])
 
     XPRV_HEADERS = {
-        'standard':    0x04358394,  # tprv
+        'standard':    0x01343c23,  # tprv
         'p2wpkh-p2sh': 0x044a4e28,  # uprv
         'p2wsh-p2sh':  0x024285b5,  # Uprv
         'p2wpkh':      0x045f18bc,  # vprv
         'p2wsh':       0x02575048,  # Vprv
     }
     XPUB_HEADERS = {
-        'standard':    0x043587cf,  # tpub
+        'standard':    0x013440e2,  # tpub
         'p2wpkh-p2sh': 0x044a5262,  # upub
         'p2wsh-p2sh':  0x024289ef,  # Upub
         'p2wpkh':      0x045f1cf6,  # vpub
diff --git a/electrum/currencies.json b/electrum/currencies.json
index f0fabafa..63ae5e1b 100644
--- a/electrum/currencies.json
+++ b/electrum/currencies.json
@@ -49,6 +49,7 @@
         "EUR",
         "FJD",
         "FKP",
+        "FLO",
         "GBP",
         "GEL",
         "GHS",
@@ -428,6 +429,7 @@
         "ETB",
         "EUR",
         "FJD",
+        "FLO",
         "FKP",
         "GBP",
         "GEL",
diff --git a/electrum/gui/qt/history_list.py b/electrum/gui/qt/history_list.py
index 79fe4d3a..c789bc57 100644
--- a/electrum/gui/qt/history_list.py
+++ b/electrum/gui/qt/history_list.py
@@ -175,13 +175,13 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
         grid = QGridLayout()
         grid.addWidget(QLabel(_("Start")), 0, 0)
         grid.addWidget(QLabel(self.format_date(start_date)), 0, 1)
-        grid.addWidget(QLabel(str(h.get('start_fiat_value')) + '/BTC'), 0, 2)
+        grid.addWidget(QLabel(str(h.get('start_fiat_value')) + '/FLO'), 0, 2)
         grid.addWidget(QLabel(_("Initial balance")), 1, 0)
         grid.addWidget(QLabel(format_amount(h['start_balance'])), 1, 1)
         grid.addWidget(QLabel(str(h.get('start_fiat_balance'))), 1, 2)
         grid.addWidget(QLabel(_("End")), 2, 0)
         grid.addWidget(QLabel(self.format_date(end_date)), 2, 1)
-        grid.addWidget(QLabel(str(h.get('end_fiat_value')) + '/BTC'), 2, 2)
+        grid.addWidget(QLabel(str(h.get('end_fiat_value')) + '/FLO'), 2, 2)
         grid.addWidget(QLabel(_("Final balance")), 4, 0)
         grid.addWidget(QLabel(format_amount(h['end_balance'])), 4, 1)
         grid.addWidget(QLabel(str(h.get('end_fiat_balance'))), 4, 2)
diff --git a/electrum/gui/qt/main_window.py b/electrum/gui/qt/main_window.py
index 75667603..e58f6480 100644
--- a/electrum/gui/qt/main_window.py
+++ b/electrum/gui/qt/main_window.py
@@ -2746,7 +2746,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
         units = base_units_list
         msg = (_('Base unit of your wallet.')
-               + '\n1 BTC = 1000 mBTC. 1 mBTC = 1000 bits. 1 bit = 100 sat.\n'
+               + '\n1 FLO = 1000 mFLO. 1 mFLO = 1000 bits. 1 bit = 100 sat.\n'
                + _('This setting affects the Send tab, and all balance related fields.'))
         unit_label = HelpLabel(_('Base unit') + ':', msg)
         unit_combo = QComboBox()
diff --git a/electrum/gui/qt/transaction_dialog.py b/electrum/gui/qt/transaction_dialog.py
index 4e8e6e67..f0a6c440 100644
--- a/electrum/gui/qt/transaction_dialog.py
+++ b/electrum/gui/qt/transaction_dialog.py
@@ -114,6 +114,8 @@ class TxDialog(QDialog, MessageBoxMixin):
         vbox.addWidget(self.size_label)
         self.fee_label = QLabel()
         vbox.addWidget(self.fee_label)
+        self.txcomment_label = QLabel()
+        vbox.addWidget(self.txcomment_label)
 
         self.add_io(vbox)
 
@@ -269,6 +271,7 @@ class TxDialog(QDialog, MessageBoxMixin):
         self.amount_label.setText(amount_str)
         self.fee_label.setText(fee_str)
         self.size_label.setText(size_str)
+        self.txcomment_label.setText("TX Comment: " + self.tx.txcomment)
         run_hook('transaction_dialog_update', self)
 
     def add_io(self, vbox):
diff --git a/electrum/plot.py b/electrum/plot.py
index 3174d1b2..ba2d4f95 100644
--- a/electrum/plot.py
+++ b/electrum/plot.py
@@ -37,7 +37,7 @@ def plot_history(history):
     plt.subplots_adjust(bottom=0.2)
     plt.xticks( rotation=25 )
     ax = plt.gca()
-    plt.ylabel('BTC')
+    plt.ylabel('FLO')
     plt.xlabel('Month')
     xfmt = md.DateFormatter('%Y-%m-%d')
     ax.xaxis.set_major_formatter(xfmt)
diff --git a/electrum/servers.json b/electrum/servers.json
index 05029bde..360c3d87 100644
--- a/electrum/servers.json
+++ b/electrum/servers.json
@@ -1,304 +1,14 @@
 {
-    "207.154.223.80": {
+    "ranchimall.duckdns.org": {
         "pruning": "-",
         "s": "50002",
         "t": "50001",
         "version": "1.2"
     },
-    "4cii7ryno5j3axe4.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "74.222.1.20": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "88.198.43.231": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "E-X.not.fyi": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "VPS.hsmiths.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "arihancckjge66iv.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "aspinall.io": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.2"
-    },
-    "bauerjda5hnedjam.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "bauerjhejlv6di7s.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "btc.asis.io": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "btc.cihar.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "btc.smsys.me": {
-        "pruning": "-",
-        "s": "995",
-        "version": "1.2"
-    },
-    "daedalus.bauerj.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "de.hamster.science": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "e.keff.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "elec.luggs.co": {
-        "pruning": "-",
-        "s": "443",
-        "version": "1.2"
-    },
-    "electrum-server.ninja": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.achow101.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.cutie.ga": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.hsmiths.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.leblancnet.us": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.meltingice.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.nute.net": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.2"
-    },
-    "electrum.poorcoding.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.qtornado.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum.vom-stausee.de": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrum0.snel.it": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrumx-core.1209k.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrumx.bot.nu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrumx.nmdps.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrumx.westeurope.cloudapp.azure.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "electrumxhqdsmlu.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "elx2018.mooo.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "helicarrier.bauerj.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "hsmiths4fyqlw5xw.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "hsmiths5mjk6uijs.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "j5jfrdthqt5g25xz.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "kirsche.emzy.de": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "luggscoqbymhvnkp.onion": {
-        "pruning": "-",
-        "t": "80",
-        "version": "1.2"
-    },
-    "ndnd.selfhost.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "ndndword5lpb7eex.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "node.arihanc.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "node.erratic.space": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "ozahtqwp25chjdjd.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "qtornadoklbgdyww.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "rbx.curalle.ovh": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.2"
-    },
-    "ruuxwv74pjxms3ws.onion": {
-        "pruning": "-",
-        "s": "10042",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "s7clinmo4cazmhul.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "songbird.bauerj.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.2"
-    },
-    "spv.48.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50003",
-        "version": "1.2"
-    },
-    "tardis.bauerj.eu": {
+    "localhost": {
         "pruning": "-",
         "s": "50002",
         "t": "50001",
         "version": "1.2"
     }
-}
+}
\ No newline at end of file
diff --git a/electrum/servers_testnet.json b/electrum/servers_testnet.json
index 4ff6d230..e70b9d69 100644
--- a/electrum/servers_testnet.json
+++ b/electrum/servers_testnet.json
@@ -1,31 +1,14 @@
 {
-    "electrumx.kekku.li": {
-        "pruning": "-",
-        "s": "51002",
-        "version": "1.2"
-    },
-    "hsmithsxurybd7uh.onion": {
-        "pruning": "-",
-        "s": "53012",
-        "t": "53011",
-        "version": "1.2"
-    },
-    "testnet.hsmiths.com": {
-        "pruning": "-",
-        "s": "53012",
-        "t": "53011",
-        "version": "1.2"
-    },
-    "testnet.qtornado.com": {
+    "ranchimall.duckdns.org": {
         "pruning": "-",
         "s": "51002",
         "t": "51001",
         "version": "1.2"
     },
-    "testnet1.bauerj.eu": {
+    "localhost": {
         "pruning": "-",
-        "s": "50002",
-        "t": "50001",
+        "s": "51002",
+        "t": "51001",
         "version": "1.2"
     }
-}
+}
\ No newline at end of file
diff --git a/electrum/simple_config.py b/electrum/simple_config.py
index 25efbb8d..8d7846be 100644
--- a/electrum/simple_config.py
+++ b/electrum/simple_config.py
@@ -195,7 +195,7 @@ class SimpleConfig(PrintError):
         base_unit = self.user_config.get('base_unit')
         if isinstance(base_unit, str):
             self._set_key_in_user_config('base_unit', None)
-            map_ = {'btc':8, 'mbtc':5, 'ubtc':2, 'bits':2, 'sat':0}
+            map_ = {'FLO':8, 'mFLO':5, 'uFLO':2, 'bits':2, 'sat':0}
             decimal_point = map_.get(base_unit.lower())
             self._set_key_in_user_config('decimal_point', decimal_point)
 
diff --git a/electrum/transaction.py b/electrum/transaction.py
index 8fcce24c..c19f6829 100644
--- a/electrum/transaction.py
+++ b/electrum/transaction.py
@@ -34,6 +34,7 @@ from .util import print_error, profiler
 from . import ecc
 from . import bitcoin
 from .bitcoin import *
+import codecs
 import struct
 import traceback
 import sys
@@ -596,6 +597,10 @@ def deserialize(raw: str, force_full_parse=False) -> dict:
             txin = d['inputs'][i]
             parse_witness(vds, txin, full_parse=full_parse)
     d['lockTime'] = vds.read_uint32()
+    if d['version'] >= 2:
+        d['txcomment'] = vds.read_string()
+    else:
+        d['txcomment'] = ""
     if vds.can_read_more():
         raise SerializationError('extra junk at the end')
     return d
@@ -636,6 +641,7 @@ class Transaction:
         self._inputs = None
         self._outputs = None
         self.locktime = 0
+        self.txcomment = ""
         self.version = 1
         # by default we assume this is a partial txn;
         # this value will get properly set when deserializing
@@ -728,16 +734,18 @@ class Transaction:
         self._outputs = [TxOutput(x['type'], x['address'], x['value']) for x in d['outputs']]
         self.locktime = d['lockTime']
         self.version = d['version']
+        self.txcomment = d['txcomment']
         self.is_partial_originally = d['partial']
         self._segwit_ser = d['segwit_ser']
         return d
 
     @classmethod
-    def from_io(klass, inputs, outputs, locktime=0):
+    def from_io(klass, inputs, outputs, locktime=0, txcomment=""):
         self = klass(None)
         self._inputs = inputs
         self._outputs = outputs
         self.locktime = locktime
+        self.txcomment = txcomment
         return self
 
     @classmethod
@@ -989,6 +997,7 @@ class Transaction:
         nVersion = int_to_hex(self.version, 4)
         nHashType = int_to_hex(1, 4)
         nLocktime = int_to_hex(self.locktime, 4)
+        nTxComment = var_int(len(self.txcomment)) + str(codecs.encode(bytes(self.txcomment, 'utf-8'), 'hex_codec'), 'utf-8')
         inputs = self.inputs()
         outputs = self.outputs()
         txin = inputs[i]
@@ -1002,11 +1011,17 @@ class Transaction:
             scriptCode = var_int(len(preimage_script) // 2) + preimage_script
             amount = int_to_hex(txin['value'], 8)
             nSequence = int_to_hex(txin.get('sequence', 0xffffffff - 1), 4)
-            preimage = nVersion + hashPrevouts + hashSequence + outpoint + scriptCode + amount + nSequence + hashOutputs + nLocktime + nHashType
+            if self.version >= 2:
+                preimage = nVersion + hashPrevouts + hashSequence + outpoint + scriptCode + amount + nSequence + hashOutputs + nLocktime + nTxComment + nHashType
+            else:
+                preimage = nVersion + hashPrevouts + hashSequence + outpoint + scriptCode + amount + nSequence + hashOutputs + nLocktime + nHashType
         else:
             txins = var_int(len(inputs)) + ''.join(self.serialize_input(txin, self.get_preimage_script(txin) if i==k else '') for k, txin in enumerate(inputs))
             txouts = var_int(len(outputs)) + ''.join(self.serialize_output(o) for o in outputs)
-            preimage = nVersion + txins + txouts + nLocktime + nHashType
+            if self.version >= 2:
+                preimage = nVersion + txins + txouts + nLocktime + nTxComment + nHashType
+            else:
+                preimage = nVersion + txins + txouts + nLocktime + nHashType
         return preimage
 
     def is_segwit(self, guess_for_address=False):
@@ -1027,6 +1042,7 @@ class Transaction:
     def serialize_to_network(self, estimate_size=False, witness=True):
         nVersion = int_to_hex(self.version, 4)
         nLocktime = int_to_hex(self.locktime, 4)
+        nTxComment = var_int(len(self.txcomment)) + str(codecs.encode(bytes(self.txcomment, 'utf-8'), 'hex_codec'), 'utf-8')
         inputs = self.inputs()
         outputs = self.outputs()
         txins = var_int(len(inputs)) + ''.join(self.serialize_input(txin, self.input_script(txin, estimate_size)) for txin in inputs)
@@ -1039,9 +1055,15 @@ class Transaction:
             marker = '00'
             flag = '01'
             witness = ''.join(self.serialize_witness(x, estimate_size) for x in inputs)
-            return nVersion + marker + flag + txins + txouts + witness + nLocktime
+            if self.version >= 2:
+                return nVersion + marker + flag + txins + txouts + witness + nLocktime + nTxComment
+            else:
+                return nVersion + marker + flag + txins + txouts + witness + nLocktime
         else:
-            return nVersion + txins + txouts + nLocktime
+            if self.version >= 2:
+                return nVersion + txins + txouts + nLocktime + nTxComment
+            else:
+                return nVersion + txins + txouts + nLocktime
 
     def txid(self):
         self.deserialize()
diff --git a/electrum/util.py b/electrum/util.py
index 123dc212..6e4a6bc6 100644
--- a/electrum/util.py
+++ b/electrum/util.py
@@ -45,9 +45,9 @@ def inv_dict(d):
     return {v: k for k, v in d.items()}
 
 
-base_units = {'BTC':8, 'mBTC':5, 'bits':2, 'sat':0}
+base_units = {'FLO':8, 'mFLO':5, 'bits':2, 'sat':0}
 base_units_inverse = inv_dict(base_units)
-base_units_list = ['BTC', 'mBTC', 'bits', 'sat']  # list(dict) does not guarantee order
+base_units_list = ['FLO', 'mFLO', 'bits', 'sat']  # list(dict) does not guarantee order
 
 
 def decimal_point_to_base_unit_name(dp: int) -> str:
@@ -132,7 +132,7 @@ class Satoshis(object):
         return 'Satoshis(%d)'%self.value
 
     def __str__(self):
-        return format_satoshis(self.value) + " BTC"
+        return format_satoshis(self.value) + " FLO"
 
 class Fiat(object):
     __slots__ = ('value', 'ccy')