Merging upstrem changes

This commit adds the code for FLO chunk verification. FLO chunk verification is different from Bitcoin chunk verification as the blockchain has 3 different target recalculation times. ie. 90 blocks at height 0->208440, 15 blocks at height 208440->426000 & 1 block further down

Changes have also been maded such that chunk doesnt need to be saved in parts

electrum/address_synchronizer.py

@@ -78,7 +78,8 @@ class AddressSynchronizer(PrintError):
                                                  conf=None,
                                                  timestamp=timestamp,
                                                  txpos=txpos,
-                                                 header_hash=header_hash)
+                                                 header_hash=header_hash,
+                                                 flodata=flodata)
         # Transactions pending verification.  txid -> tx_height. Access with self.lock.
         self.unverified_tx = defaultdict(int)
         # true when synchronized
@@ -626,6 +627,23 @@ class AddressSynchronizer(PrintError):
                 # local transaction
                 return TxMinedInfo(height=TX_HEIGHT_LOCAL, conf=0)
 
+    def get_flodata(self, tx_hash: str):
+        """ Given a transaction, returns flodata """
+        with self.lock:
+            if tx_hash in self.verified_tx:
+                info = self.verified_tx[tx_hash]
+                flodata = info[4]
+                return flodata
+            elif tx_hash in self.unverified_tx:
+                tx = self.transactions.get(tx_hash)
+                flodata = tx.flodata[5:]
+                return flodata
+            else:
+                # local transaction
+                tx = self.transactions.get(tx_hash)
+                flodata = tx.flodata[5:]
+                return flodata
+
     def set_up_to_date(self, up_to_date):
         with self.lock:
             self.up_to_date = up_to_date
@@ -775,7 +793,7 @@ class AddressSynchronizer(PrintError):
 
     @with_local_height_cached
     def get_addr_balance(self, address):
-        """Return the balance of a bitcoin address:
+        """Return the balance of a FLO address:
         confirmed and matured, unconfirmed, unmatured
         """
         received, sent = self.get_addr_io(address)

electrum/blockchain.py

@@ -31,9 +31,16 @@ from . import constants
 from .util import bfh, bh2u
 from .simple_config import SimpleConfig
 
+try:
+    import scrypt
+    getPoWHash = lambda x: scrypt.hash(x, x, N=1024, r=1, p=1, buflen=32)
+except ImportError:
+    util.print_msg("Warning: package scrypt not available; synchronization could be very slow")
+    from .scrypt import scrypt_1024_1_1_80 as getPoWHash
+
 
 HEADER_SIZE = 80  # bytes
-MAX_TARGET = 0x00000000FFFF0000000000000000000000000000000000000000000000000000
+MAX_TARGET = 0x00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
 
 
 class MissingHeader(Exception):
@@ -254,34 +261,70 @@ class Blockchain(util.PrintError):
     @classmethod
     def verify_header(cls, header: dict, prev_hash: str, target: int, expected_header_hash: str=None) -> None:
         _hash = hash_header(header)
+        _powhash = pow_hash_header(header)
         if expected_header_hash and expected_header_hash != _hash:
             raise Exception("hash mismatches with expected: {} vs {}".format(expected_header_hash, _hash))
         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 = cls.target_to_bits(target)
+        #bits = cls.target_to_bits(target)
+        bits = target
         if bits != header.get('bits'):
             raise Exception("bits mismatch: %s vs %s" % (bits, header.get('bits')))
-        block_hash_as_num = int.from_bytes(bfh(_hash), byteorder='big')
+        block_hash = int('0x' + _hash, 16)
-        if block_hash_as_num > target:
+        target_val = self.bits_to_target(bits)
-            raise Exception(f"insufficient proof of work: {block_hash_as_num} vs target {target}")
+        if int('0x' + _powhash, 16) > target_val:
+            raise Exception("insufficient proof of work: %s vs target %s" % (int('0x' + _hash, 16), target_val))
 
     def verify_chunk(self, index: int, data: bytes) -> None:
         num = len(data) // HEADER_SIZE
-        start_height = index * 2016
+        current_header = index * 2016
-        prev_hash = self.get_hash(start_height - 1)
+        prev_hash = self.get_hash(current_header - 1)
-        target = self.get_target(index-1)
+        headerLast = None
+        headerFirst = None
+        capture = None
+        lst = []
         for i in range(num):
-            height = start_height + i
+            averaging_interval = self.AveragingInterval(current_header)
-            try:
+            difficulty_interval = self.DifficultyAdjustmentInterval(current_header)
-                expected_header_hash = self.get_hash(height)
+            if current_header < 426000:
-            except MissingHeader:
+                target = self.get_target(current_header - 1, headerLast, headerFirst)
-                expected_header_hash = None
+                try:
-            raw_header = data[i*HEADER_SIZE : (i+1)*HEADER_SIZE]
+                    expected_header_hash = self.get_hash(current_header)
-            header = deserialize_header(raw_header, index*2016 + i)
+                except MissingHeader:
-            self.verify_header(header, prev_hash, target, expected_header_hash)
+                    expected_header_hash = None
-            prev_hash = hash_header(header)
+                raw_header = data[i*HEADER_SIZE : (i+1)*HEADER_SIZE]
+                header = deserialize_header(raw_header, current_header)
+                self.verify_header(header, prev_hash, target, expected_header_hash)
+                prev_hash = hash_header(header)
+                headerLast = header
+                if current_header == 0:
+                    headerFirst = header
+                elif (current_header + averaging_interval + 1) % difficulty_interval  == 0:
+                    capture = header
+                if current_header != 0 and current_header % difficulty_interval == 0:
+                    headerFirst = capture
+                if current_header >= 425993:
+                    lst.append(headerLast)
+                current_header = current_header + 1
+            else:
+                if len(lst)>6:
+                    headerFirst = lst[0]
+                target = self.get_target(current_header - 1, headerLast, headerFirst)
+                try:
+                    expected_header_hash = self.get_hash(current_header)
+                except MissingHeader:
+                    expected_header_hash = None
+                raw_header = data[i * HEADER_SIZE: (i + 1) * HEADER_SIZE]
+                header = deserialize_header(raw_header, current_header)
+                self.verify_header(header, prev_hash, target, expected_header_hash)
+                prev_hash = hash_header(header)
+                headerLast = header
+                lst.append(header)
+                if len(lst)>7:
+                    lst.pop(0)
+                current_header = current_header + 1
 
     @with_lock
     def path(self):
@@ -446,30 +489,60 @@ class Blockchain(util.PrintError):
                 raise MissingHeader(height)
             return hash_header(header)
 
-    def get_target(self, index: int) -> int:
+    def get_target(self, index: int, headerLast: dict=None, headerFirst: dict=None) -> int:
         # compute target from chunk x, used in chunk x+1
         if constants.net.TESTNET:
             return 0
-        if index == -1:
+            # The range is first 90 blocks because FLO's block time was 90 blocks when it started
-            return MAX_TARGET
+        if -1 <= index <= 88:
+            return 0x1e0ffff0
         if index < len(self.checkpoints):
             h, t = self.checkpoints[index]
             return t
         # new target
-        first = self.read_header(index * 2016)
+        if headerLast is None:
-        last = self.read_header(index * 2016 + 2015)
+            headerLast = self.read_header(index)
-        if not first or not last:
+        height = headerLast["block_height"]
-            raise MissingHeader()
+        # check if the height passes is in range for retargeting
-        bits = last.get('bits')
+        if (height + 1) % self.DifficultyAdjustmentInterval(height + 1) != 0:
-        target = self.bits_to_target(bits)
+            return int(headerLast["bits"])
-        nActualTimespan = last.get('timestamp') - first.get('timestamp')
+        if headerFirst is None:
-        nTargetTimespan = 14 * 24 * 60 * 60
+            averagingInterval = self.AveragingInterval(height + 1)
-        nActualTimespan = max(nActualTimespan, nTargetTimespan // 4)
+            blockstogoback = averagingInterval - 1
-        nActualTimespan = min(nActualTimespan, nTargetTimespan * 4)
+            # print("Blocks to go back = " + str(blockstogoback))
-        new_target = min(MAX_TARGET, (target * nActualTimespan) // nTargetTimespan)
+            if (height + 1) != averagingInterval:
-        # not any target can be represented in 32 bits:
+                blockstogoback = averagingInterval
-        new_target = self.bits_to_target(self.target_to_bits(new_target))
+            firstHeight = height - blockstogoback
-        return new_target
+            headerFirst = self.read_header(int(firstHeight))
+
+        firstBlockTime = headerFirst["timestamp"]
+        nMinActualTimespan = int(self.MinActualTimespan(int(headerLast["block_height"]) + 1))
+
+        nMaxActualTimespan = int(self.MaxActualTimespan(int(headerLast["block_height"]) + 1))
+        # Limit adjustment step
+        nActualTimespan = headerLast["timestamp"] - firstBlockTime
+        if nActualTimespan < nMinActualTimespan:
+            nActualTimespan = nMinActualTimespan
+        if nActualTimespan > nMaxActualTimespan:
+            nActualTimespan = nMaxActualTimespan
+        # Retarget
+        bnNewBits = int(headerLast["bits"])
+        bnNew = self.bits_to_target(bnNewBits)
+        bnOld = bnNew
+        # FLO: intermediate uint256 can overflow by 1 bit
+        # const arith_uint256 bnPowLimit = UintToArith256(params.powLimit);
+        fShift = bnNew > MAX_TARGET - 1
+
+        if (fShift):
+            bnNew = bnNew >> 1
+        bnNew = bnNew * nActualTimespan
+        bnNew = bnNew / self.TargetTimespan(headerLast["block_height"] + 1)
+        if fShift:
+            bnNew = bnNew << 1
+        if bnNew > MAX_TARGET:
+            bnNew = MAX_TARGET
+        bnNew = self.target_to_bits(int(bnNew))
+        return bnNew
 
     @classmethod
     def bits_to_target(cls, bits: int) -> int:
@@ -542,7 +615,7 @@ class Blockchain(util.PrintError):
         if prev_hash != header.get('prev_block_hash'):
             return False
         try:
-            target = self.get_target(height // 2016 - 1)
+            target = self.get_target(height - 1)
         except MissingHeader:
             return False
         try:
@@ -573,6 +646,61 @@ class Blockchain(util.PrintError):
             cp.append((h, target))
         return cp
 
+    def AveragingInterval(self, height):
+        # V1
+        if height < constants.net.nHeight_Difficulty_Version2:
+            return constants.net.nAveragingInterval_Version1
+        # V2
+        elif height < constants.net.nHeight_Difficulty_Version3:
+            return constants.net.nAveragingInterval_Version2
+        # V3
+        else:
+            return constants.net.nAveragingInterval_Version3
+
+    def MinActualTimespan(self, height):
+        averagingTargetTimespan = self.AveragingInterval(height) * constants.net.nPowTargetSpacing
+        # V1
+        if height < constants.net.nHeight_Difficulty_Version2:
+            return int(averagingTargetTimespan * (100 - constants.net.nMaxAdjustUp_Version1) / 100)
+        # V2
+        elif height < constants.net.nHeight_Difficulty_Version3:
+            return int(averagingTargetTimespan * (100 - constants.net.nMaxAdjustUp_Version2) / 100)
+        # V3
+        else:
+            return int(averagingTargetTimespan * (100 - constants.net.nMaxAdjustUp_Version3) / 100)
+
+    def MaxActualTimespan(self, height):
+        averagingTargetTimespan = self.AveragingInterval(height) * constants.net.nPowTargetSpacing
+        # V1
+        if height < constants.net.nHeight_Difficulty_Version2:
+            return int(averagingTargetTimespan * (100 + constants.net.nMaxAdjustDown_Version1) / 100)
+        # V2
+        elif height < constants.net.nHeight_Difficulty_Version3:
+            return int(averagingTargetTimespan * (100 + constants.net.nMaxAdjustDown_Version2) / 100)
+        # V3
+        else:
+            return int(averagingTargetTimespan * (100 + constants.net.nMaxAdjustDown_Version3) / 100)
+
+    def TargetTimespan(self, height):
+        # V1
+        if height < constants.net.nHeight_Difficulty_Version2:
+            return constants.net.nTargetTimespan_Version1
+        # V2
+        if height < constants.net.nHeight_Difficulty_Version3:
+            return constants.net.nAveragingInterval_Version2 * constants.net.nPowTargetSpacing
+        # V3
+        return constants.net.nAveragingInterval_Version3 * constants.net.nPowTargetSpacing
+
+    def DifficultyAdjustmentInterval(self, height):
+        # V1
+        if height < constants.net.nHeight_Difficulty_Version2:
+            return constants.net.nInterval_Version1
+        # V2
+        if height < constants.net.nHeight_Difficulty_Version3:
+            return constants.net.nInterval_Version2
+        # V3
+        return constants.net.nInterval_Version3
+
 
 def check_header(header: dict) -> Optional[Blockchain]:
     if type(header) is not dict:

electrum/constants.py

@@ -47,59 +47,104 @@ class AbstractNet:
 class BitcoinMainnet(AbstractNet):
 
     TESTNET = False
-    WIF_PREFIX = 0x80
+    WIF_PREFIX = 0xa3
-    ADDRTYPE_P2PKH = 0
+    ADDRTYPE_P2PKH = 35
-    ADDRTYPE_P2SH = 5
+    ADDRTYPE_P2SH = 8
-    SEGWIT_HRP = "bc"
+    SEGWIT_HRP = "ltc"
-    GENESIS = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
+    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
+    # FLO Network constants
+    fPowAllowMinDifficultyBlocks = False
+    fPowNoRetargeting = False
+    nRuleChangeActivationThreshold = 6048  # 75% of 8064
+    nMinerConfirmationWindow = 8064
+    # Difficulty adjustments
+    nPowTargetSpacing = 40  # 40s block time
+    # V1
+    nTargetTimespan_Version1 = 60 * 60
+    nInterval_Version1 = nTargetTimespan_Version1 / nPowTargetSpacing
+    nMaxAdjustUp_Version1 = 75
+    nMaxAdjustDown_Version1 = 300
+    nAveragingInterval_Version1 = nInterval_Version1
+    # V2
+    nHeight_Difficulty_Version2 = 208440
+    nInterval_Version2 = 15
+    nMaxAdjustDown_Version2 = 300
+    nMaxAdjustUp_Version2 = 75
+    nAveragingInterval_Version2 = nInterval_Version2
+    # V3
+    nHeight_Difficulty_Version3 = 426000
+    nInterval_Version3 = 1
+    nMaxAdjustDown_Version3 = 3
+    nMaxAdjustUp_Version3 = 2
+    nAveragingInterval_Version3 = 6
 
 
 class BitcoinTestnet(AbstractNet):
 
     TESTNET = True
     WIF_PREFIX = 0xef
-    ADDRTYPE_P2PKH = 111
+    ADDRTYPE_P2PKH = 115
-    ADDRTYPE_P2SH = 196
+    ADDRTYPE_P2SH = 198
-    SEGWIT_HRP = "tb"
+    SEGWIT_HRP = "tltc"
-    GENESIS = "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"
+    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
         'p2wsh':       0x02575483,  # Vpub
     }
     BIP44_COIN_TYPE = 1
+    #Difficulty adjustments
+    nPowTargetSpacing = 40 # 40 block time
+    # V1
+    nTargetTimespan_Version1 = 60 * 60
+    nInterval_Version1 = nTargetTimespan_Version1 / nPowTargetSpacing;
+    nMaxAdjustUp_Version1 = 75
+    nMaxAdjustDown_Version1 = 300
+    nAveragingInterval_Version1 = nInterval_Version1
+    # V2
+    nHeight_Difficulty_Version2 = 50000
+    nInterval_Version2 = 15
+    nMaxAdjustDown_Version2 = 300
+    nMaxAdjustUp_Version2 = 75
+    nAveragingInterval_Version2 = nInterval_Version2
+    # V3
+    nHeight_Difficulty_Version3 = 60000
+    nInterval_Version3 = 1
+    nMaxAdjustDown_Version3 = 3
+    nMaxAdjustUp_Version3 = 2
+    nAveragingInterval_Version3 = 6
 
 
 class BitcoinRegtest(BitcoinTestnet):

electrum/gui/kivy/main_window.py

@@ -941,6 +941,16 @@ class ElectrumWindow(App):
         d = LabelDialog(_('Enter description'), text, callback)
         d.open()
 
+    def flodata_dialog(self, screen):
+        from .uix.dialogs.label_dialog import LabelDialog
+        text = screen.flodata
+
+        def callback(text):
+            screen.flodata = text
+
+        d = LabelDialog(_('Enter FLO data'), text, callback)
+        d.open()
+
     def amount_dialog(self, screen, show_max):
         from .uix.dialogs.amount_dialog import AmountDialog
         amount = screen.amount
@@ -990,6 +1000,7 @@ class ElectrumWindow(App):
     def on_fee(self, event, *arg):
         self.fee_status = self.electrum_config.get_fee_status()
 
+
     def protected(self, msg, f, args):
         if self.wallet.has_password():
             on_success = lambda pw: f(*(args + (pw,)))

electrum/gui/kivy/uix/screens.py

@@ -177,7 +177,7 @@ class SendScreen(CScreen):
         try:
             uri = electrum.util.parse_URI(text, self.app.on_pr)
         except:
-            self.app.show_info(_("Not a Bitcoin URI"))
+            self.app.show_info(_("Not a FLO URI"))
             return
         amount = uri.get('amount')
         self.screen.address = uri.get('address', '')
@@ -185,6 +185,7 @@ class SendScreen(CScreen):
         self.screen.amount = self.app.format_amount_and_units(amount) if amount else ''
         self.payment_request = None
         self.screen.is_pr = False
+        self.screen.flodata = uri.get('flodata', '')
 
     def update(self):
         if self.app.wallet and self.payment_request_queued:
@@ -197,6 +198,7 @@ class SendScreen(CScreen):
         self.screen.address = ''
         self.payment_request = None
         self.screen.is_pr = False
+        self.screen.flodata = ''
 
     def set_request(self, pr):
         self.screen.address = pr.get_requestor()
@@ -248,10 +250,10 @@ class SendScreen(CScreen):
         else:
             address = str(self.screen.address)
             if not address:
-                self.app.show_error(_('Recipient not specified.') + ' ' + _('Please scan a Bitcoin address or a payment request'))
+                self.app.show_error(_('Recipient not specified.') + ' ' + _('Please scan a FLO address or a payment request'))
                 return
             if not bitcoin.is_address(address):
-                self.app.show_error(_('Invalid Bitcoin Address') + ':\n' + address)
+                self.app.show_error(_('Invalid FLO Address') + ':\n' + address)
                 return
             try:
                 amount = self.app.get_amount(self.screen.amount)
@@ -261,19 +263,20 @@ class SendScreen(CScreen):
             outputs = [TxOutput(bitcoin.TYPE_ADDRESS, address, amount)]
         message = self.screen.message
         amount = sum(map(lambda x:x[2], outputs))
+        flodata = str(self.screen.flodata)
         if self.app.electrum_config.get('use_rbf'):
             from .dialogs.question import Question
-            d = Question(_('Should this transaction be replaceable?'), lambda b: self._do_send(amount, message, outputs, b))
+            d = Question(_('Should this transaction be replaceable?'), lambda b: self._do_send(amount, message, outputs, b, flodata))
             d.open()
         else:
-            self._do_send(amount, message, outputs, False)
+            self._do_send(amount, message, outputs, False, flodata)
 
-    def _do_send(self, amount, message, outputs, rbf):
+    def _do_send(self, amount, message, outputs, rbf, flodata):
         # make unsigned transaction
         config = self.app.electrum_config
         coins = self.app.wallet.get_spendable_coins(None, config)
         try:
-            tx = self.app.wallet.make_unsigned_transaction(coins, outputs, config, None)
+            tx = self.app.wallet.make_unsigned_transaction(coins, outputs, config, None, flodata=flodata)
         except NotEnoughFunds:
             self.app.show_error(_("Not enough funds"))
             return
@@ -379,7 +382,7 @@ class ReceiveScreen(CScreen):
 
     def do_share(self):
         uri = self.get_URI()
-        self.app.do_share(uri, _("Share Bitcoin Request"))
+        self.app.do_share(uri, _("Share FLO Request"))
 
     def do_copy(self):
         uri = self.get_URI()

electrum/gui/kivy/uix/ui_screens/send.kv

@@ -11,6 +11,7 @@ SendScreen:
     address: ''
     amount: ''
     message: ''
+    flodata: ''
     is_pr: False
     BoxLayout
         padding: '12dp', '12dp', '12dp', '12dp'
@@ -38,6 +39,24 @@ SendScreen:
             CardSeparator:
                 opacity: int(not root.is_pr)
                 color: blue_bottom.foreground_color
+            BoxLayout:
+                id: flodata_selection
+                size_hint: 1, None
+                height: blue_bottom.item_height
+                spacing: '5dp'
+                Image:
+                    source: 'atlas://electrum/gui/kivy/theming/light/pen'
+                    size_hint: None, None
+                    size: '22dp', '22dp'
+                    pos_hint: {'center_y': .5}
+                BlueButton:
+                    id: flodata
+                    text: s.flodata if s.flodata else (_('No FLO data') if root.is_pr else _('FLO data'))
+                    disabled: root.is_pr
+                    on_release: Clock.schedule_once(lambda dt: app.flodata_dialog(s))
+            CardSeparator:
+                opacity: int(not root.is_pr)
+                color: blue_bottom.foreground_color
             BoxLayout:
                 size_hint: 1, None
                 height: blue_bottom.item_height

electrum/gui/qt/history_list.py

@@ -459,13 +459,13 @@ class HistoryList(MyTreeView, 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)

electrum/gui/qt/main_window.py

@@ -433,8 +433,8 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         if self.wallet.is_watching_only():
             msg = ' '.join([
                 _("This wallet is watching-only."),
-                _("This means you will not be able to spend Bitcoins with it."),
+                _("This means you will not be able to spend FLO with it."),
-                _("Make sure you own the seed phrase or the private keys, before you request Bitcoins to be sent to this wallet.")
+                _("Make sure you own the seed phrase or the private keys, before you request FLO to be sent to this wallet.")
             ])
             self.show_warning(msg, title=_('Information'))
 
@@ -596,11 +596,11 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
     def show_about(self):
         QMessageBox.about(self, "Electrum",
                           (_("Version")+" %s" % ELECTRUM_VERSION + "\n\n" +
-                           _("Electrum's focus is speed, with low resource usage and simplifying Bitcoin.") + " " +
+                           _("Electrum's focus is speed, with low resource usage and simplifying FLO.") + " " +
                            _("You do not need to perform regular backups, because your wallet can be "
                               "recovered from a secret phrase that you can memorize or write on paper.") + " " +
                            _("Startup times are instant because it operates in conjunction with high-performance "
-                              "servers that handle the most complicated parts of the Bitcoin system.") + "\n\n" +
+                              "servers that handle the most complicated parts of the FLO system.") + "\n\n" +
                            _("Uses icons from the Icons8 icon pack (icons8.com).")))
 
     def show_report_bug(self):
@@ -835,7 +835,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         self.receive_address_e = ButtonsLineEdit()
         self.receive_address_e.addCopyButton(self.app)
         self.receive_address_e.setReadOnly(True)
-        msg = _('Bitcoin address where the payment should be received. Note that each payment request uses a different Bitcoin address.')
+        msg = _('FLO address where the payment should be received. Note that each payment request uses a different Bitcoin address.')
         self.receive_address_label = HelpLabel(_('Receiving address'), msg)
         self.receive_address_e.textChanged.connect(self.update_receive_qr)
         self.receive_address_e.setFocusPolicy(Qt.ClickFocus)
@@ -865,8 +865,8 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         msg = ' '.join([
             _('Expiration date of your request.'),
             _('This information is seen by the recipient if you send them a signed payment request.'),
-            _('Expired requests have to be deleted manually from your list, in order to free the corresponding Bitcoin addresses.'),
+            _('Expired requests have to be deleted manually from your list, in order to free the corresponding FLO addresses.'),
-            _('The bitcoin address never expires and will always be part of this electrum wallet.'),
+            _('The FLO address never expires and will always be part of this electrum wallet.'),
         ])
         grid.addWidget(HelpLabel(_('Request expires'), msg), 3, 0)
         grid.addWidget(self.expires_combo, 3, 1)
@@ -1096,7 +1096,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         self.amount_e = BTCAmountEdit(self.get_decimal_point)
         self.payto_e = PayToEdit(self)
         msg = _('Recipient of the funds.') + '\n\n'\
-              + _('You may enter a Bitcoin address, a label from your list of contacts (a list of completions will be proposed), or an alias (email-like address that forwards to a Bitcoin address)')
+              + _('You may enter a FLO address, a label from your list of contacts (a list of completions will be proposed), or an alias (email-like address that forwards to a Bitcoin address)')
         payto_label = HelpLabel(_('Pay to'), msg)
         grid.addWidget(payto_label, 1, 0)
         grid.addWidget(self.payto_e, 1, 1, 1, -1)
@@ -1113,10 +1113,16 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         self.message_e = MyLineEdit()
         grid.addWidget(self.message_e, 2, 1, 1, -1)
 
+        msg = _('This is where you write the FLO Data for the transaction')
+        flodata_label = HelpLabel(_('FLO Data'), msg)
+        grid.addWidget(flodata_label, 3, 0)
+        self.message_tx_e = MyLineEdit()
+        grid.addWidget(self.message_tx_e, 3, 1, 1, -1)
+
         self.from_label = QLabel(_('From'))
-        grid.addWidget(self.from_label, 3, 0)
+        grid.addWidget(self.from_label, 4, 0)
         self.from_list = FromList(self, self.from_list_menu)
-        grid.addWidget(self.from_list, 3, 1, 1, -1)
+        grid.addWidget(self.from_list, 4, 1, 1, -1)
         self.set_pay_from([])
 
         msg = _('Amount to be sent.') + '\n\n' \
@@ -1124,24 +1130,24 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
               + _('Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.') + '\n\n' \
               + _('Keyboard shortcut: type "!" to send all your coins.')
         amount_label = HelpLabel(_('Amount'), msg)
-        grid.addWidget(amount_label, 4, 0)
+        grid.addWidget(amount_label, 5, 0)
-        grid.addWidget(self.amount_e, 4, 1)
+        grid.addWidget(self.amount_e, 5, 1)
 
         self.fiat_send_e = AmountEdit(self.fx.get_currency if self.fx else '')
         if not self.fx or not self.fx.is_enabled():
             self.fiat_send_e.setVisible(False)
-        grid.addWidget(self.fiat_send_e, 4, 2)
+        grid.addWidget(self.fiat_send_e, 5, 2)
         self.amount_e.frozen.connect(
             lambda: self.fiat_send_e.setFrozen(self.amount_e.isReadOnly()))
 
         self.max_button = EnterButton(_("Max"), self.spend_max)
         self.max_button.setFixedWidth(140)
-        grid.addWidget(self.max_button, 4, 3)
+        grid.addWidget(self.max_button, 5, 3)
         hbox = QHBoxLayout()
         hbox.addStretch(1)
-        grid.addLayout(hbox, 4, 4)
+        grid.addLayout(hbox, 5, 4)
 
-        msg = _('Bitcoin transactions are in general not free. A transaction fee is paid by the sender of the funds.') + '\n\n'\
+        msg = _('FLO transactions are in general not free. A transaction fee is paid by the sender of the funds.') + '\n\n'\
               + _('The amount of fee can be decided freely by the sender. However, transactions with low fees take more time to be processed.') + '\n\n'\
               + _('A suggested fee is automatically added to this field. You may override it. The suggested fee increases with the size of the transaction.')
         self.fee_e_label = HelpLabel(_('Fee'), msg)
@@ -1221,7 +1227,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         vbox_feelabel = QVBoxLayout()
         vbox_feelabel.addWidget(self.fee_e_label)
         vbox_feelabel.addStretch(1)
-        grid.addLayout(vbox_feelabel, 5, 0)
+        grid.addLayout(vbox_feelabel, 6, 0)
 
         self.fee_adv_controls = QWidget()
         hbox = QHBoxLayout(self.fee_adv_controls)
@@ -1236,7 +1242,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         vbox_feecontrol.addWidget(self.fee_adv_controls)
         vbox_feecontrol.addWidget(self.fee_slider)
 
-        grid.addLayout(vbox_feecontrol, 5, 1, 1, -1)
+        grid.addLayout(vbox_feecontrol, 6, 1, 1, -1)
 
         if not self.config.get('show_fee', False):
             self.fee_adv_controls.setVisible(False)
@@ -1250,7 +1256,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         buttons.addWidget(self.clear_button)
         buttons.addWidget(self.preview_button)
         buttons.addWidget(self.send_button)
-        grid.addLayout(buttons, 6, 1, 1, 3)
+        grid.addLayout(buttons, 7, 1, 1, 3)
 
         self.amount_e.shortcut.connect(self.spend_max)
         self.payto_e.textChanged.connect(self.update_fee)
@@ -1508,6 +1514,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             self.show_error(_('Payment request has expired'))
             return
         label = self.message_e.text()
+        flodata = self.message_tx_e.text()
 
         if self.payment_request:
             outputs = self.payment_request.get_outputs()
@@ -1532,7 +1539,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
         for o in outputs:
             if o.address is None:
-                self.show_error(_('Bitcoin Address is None'))
+                self.show_error(_('FLO Address is None'))
                 return
             if o.type == TYPE_ADDRESS and not bitcoin.is_address(o.address):
                 self.show_error(_('Invalid Bitcoin Address'))
@@ -1543,7 +1550,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
         fee_estimator = self.get_send_fee_estimator()
         coins = self.get_coins()
-        return outputs, fee_estimator, label, coins
+        return outputs, fee_estimator, label, coins, flodata
 
     def do_preview(self):
         self.do_send(preview = True)
@@ -1554,12 +1561,12 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         r = self.read_send_tab()
         if not r:
             return
-        outputs, fee_estimator, tx_desc, coins = r
+        outputs, fee_estimator, tx_desc, coins, flodata = r
         try:
             is_sweep = bool(self.tx_external_keypairs)
             tx = self.wallet.make_unsigned_transaction(
                 coins, outputs, self.config, fixed_fee=fee_estimator,
-                is_sweep=is_sweep)
+                is_sweep=is_sweep, flodata=flodata)
         except (NotEnoughFunds, NoDynamicFeeEstimates) as e:
             self.show_message(str(e))
             return
@@ -1792,7 +1799,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         self.not_enough_funds = False
         self.payment_request = None
         self.payto_e.is_pr = False
-        for e in [self.payto_e, self.message_e, self.amount_e, self.fiat_send_e,
+        for e in [self.payto_e, self.message_e, self.message_tx_e, self.amount_e, self.fiat_send_e,
                   self.fee_e, self.feerate_e]:
             e.setText('')
             e.setFrozen(False)

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.flodata_label = QLabel()
+        vbox.addWidget(self.flodata_label)
 
         self.add_io(vbox)
 
@@ -271,6 +273,7 @@ class TxDialog(QDialog, MessageBoxMixin):
         self.amount_label.setText(amount_str)
         self.fee_label.setText(fee_str)
         self.size_label.setText(size_str)
+        self.flodata_label.setText("FLO data: " + self.tx.flodata)
         run_hook('transaction_dialog_update', self)
 
     def add_io(self, vbox):

electrum/gui/text.py

@@ -337,7 +337,7 @@ class ElectrumGui:
 
     def do_send(self):
         if not is_address(self.str_recipient):
-            self.show_message(_('Invalid Bitcoin address'))
+            self.show_message(_('Invalid FLO address'))
             return
         try:
             amount = int(Decimal(self.str_amount) * COIN)

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)

electrum/plugin.py

@@ -490,9 +490,9 @@ class DeviceMgr(ThreadJob, PrintError):
         # or it is not pairable
         raise DeviceUnpairableError(
             _('Electrum cannot pair with your {}.\n\n'
-              'Before you request bitcoins to be sent to addresses in this '
+              'Before you request FLO to be sent to addresses in this '
               'wallet, ensure you can pair with your device, or that you have '
-              'its seed (and passphrase, if any).  Otherwise all bitcoins you '
+              'its seed (and passphrase, if any).  Otherwise all FLO you '
               'receive will be unspendable.').format(plugin.device))
 
     def unpaired_device_infos(self, handler, plugin: 'HW_PluginBase', devices=None):

electrum/servers.json

@@ -1,409 +1,5 @@
 {
-    "3smoooajg7qqac2y.onion": {
+    "localhost": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "81-7-10-251.blue.kundencontroller.de": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "E-X.not.fyi": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "MEADS.hopto.org": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "VPS.hsmiths.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "b.ooze.cc": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "bauerjda5hnedjam.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "bauerjhejlv6di7s.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "bitcoin.corgi.party": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "bitcoin3nqy3db7c.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "bitcoins.sk": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "btc.cihar.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "btc.smsys.me": {
-        "pruning": "-",
-        "s": "995",
-        "version": "1.4"
-    },
-    "btc.xskyx.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "cashyes.zapto.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "currentlane.lovebitco.in": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "daedalus.bauerj.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "dedi.jochen-hoenicke.de": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "dragon085.startdedicated.de": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "e-1.claudioboxx.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "e.keff.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "elec.luggs.co": {
-        "pruning": "-",
-        "s": "443",
-        "version": "1.4"
-    },
-    "electrum-server.ninja": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum-unlimited.criptolayer.net": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "electrum.eff.ro": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum.festivaldelhumor.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum.hsmiths.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum.leblancnet.us": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum.mindspot.org": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "electrum.qtornado.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum.taborsky.cz": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "electrum.villocq.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum2.eff.ro": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum2.villocq.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrum3.hachre.de": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrumx.bot.nu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrumx.ddns.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrumx.ftp.sh": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "electrumx.ml": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrumx.nmdps.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrumx.soon.it": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "electrumxhqdsmlu.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "elx01.knas.systems": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "enode.duckdns.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "erbium1.sytes.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "fedaykin.goip.de": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "fn.48.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50003",
-        "version": "1.4"
-    },
-    "helicarrier.bauerj.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "hsmiths4fyqlw5xw.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "hsmiths5mjk6uijs.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "icarus.tetradrachm.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "kirsche.emzy.de": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "luggscoqbymhvnkp.onion": {
-        "pruning": "-",
-        "t": "80",
-        "version": "1.4"
-    },
-    "ndnd.selfhost.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "ndndword5lpb7eex.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "oneweek.duckdns.org": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "orannis.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "ozahtqwp25chjdjd.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "qtornadoklbgdyww.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "rbx.curalle.ovh": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "s7clinmo4cazmhul.onion": {
-        "pruning": "-",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "tardis.bauerj.eu": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "technetium.network": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "tomscryptos.com": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "ulrichard.ch": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "us.electrum.be": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "vmd27610.contaboserver.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "vmd30612.contaboserver.net": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "wsw6tua3xl24gsmi264zaep6seppjyrkyucpsmuxnjzyt3f3j6swshad.onion": {
-        "pruning": "-",
-        "s": "50002",
-        "t": "50001",
-        "version": "1.4"
-    },
-    "xray587.startdedicated.de": {
-        "pruning": "-",
-        "s": "50002",
-        "version": "1.4"
-    },
-    "yuio.top": {
         "pruning": "-",
         "s": "50002",
         "t": "50001",

electrum/simple_config.py

@@ -202,7 +202,7 @@ 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)
 

electrum/transaction.py

@@ -27,6 +27,8 @@
 
 # Note: The deserialization code originally comes from ABE.
 
+
+import codecs
 import struct
 import traceback
 import sys
@@ -642,6 +644,10 @@ 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['flodata'] = vds.read_string()
+    else:
+        d['flodata'] = ""
     if vds.can_read_more():
         raise SerializationError('extra junk at the end')
     return d
@@ -679,6 +685,7 @@ class Transaction:
         self._inputs = None
         self._outputs = None  # type: List[TxOutput]
         self.locktime = 0
+        self.flodata = ""
         self.version = 1
         # by default we assume this is a partial txn;
         # this value will get properly set when deserializing
@@ -782,16 +789,18 @@ 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.flodata = d['flodata']
         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, flodata=""):
         self = klass(None)
         self._inputs = inputs
         self._outputs = outputs
         self.locktime = locktime
+        self.flodata = flodata
         self.BIP69_sort()
         return self
 
@@ -1042,6 +1051,8 @@ class Transaction:
         nVersion = int_to_hex(self.version, 4)
         nHashType = int_to_hex(1, 4)
         nLocktime = int_to_hex(self.locktime, 4)
+        nFloData = var_int(len(self.flodata)) + str(codecs.encode(bytes(self.flodata, 'utf-8'), 'hex_codec'),
+                                                        'utf-8')
         inputs = self.inputs()
         outputs = self.outputs()
         txin = inputs[i]
@@ -1055,11 +1066,17 @@ 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 + nFloData + 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 + nFloData + nHashType
+            else:
+                preimage = nVersion + txins + txouts + nLocktime + nHashType
         return preimage
 
     def is_segwit(self, guess_for_address=False):
@@ -1081,6 +1098,8 @@ class Transaction:
         self.deserialize()
         nVersion = int_to_hex(self.version, 4)
         nLocktime = int_to_hex(self.locktime, 4)
+        nFloData = var_int(len(self.flodata)) + str(codecs.encode(bytes(self.flodata, '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)
@@ -1093,9 +1112,15 @@ 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 + nFloData
+            else:
+                return nVersion + marker + flag + txins + txouts + witness + nLocktime
         else:
-            return nVersion + txins + txouts + nLocktime
+            if self.version >= 2:
+                return nVersion + txins + txouts + nLocktime + nFloData
+            else:
+                return nVersion + txins + txouts + nLocktime
 
     def txid(self):
         self.deserialize()

electrum/util.py

@@ -62,11 +62,11 @@ def inv_dict(d):
 ca_path = certifi.where()
 
 
-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
 
-DECIMAL_POINT_DEFAULT = 5  # mBTC
+DECIMAL_POINT_DEFAULT = 5  # mFLO
 
 
 class UnknownBaseUnit(Exception): pass
@@ -149,7 +149,7 @@ class Satoshis(object):
         return 'Satoshis(%d)'%self.value
 
     def __str__(self):
-        return format_satoshis(self.value) + " BTC"
+        return format_satoshis(self.value) + " FLO"
 
     def __eq__(self, other):
         return self.value == other.value
@@ -715,12 +715,12 @@ def parse_URI(uri: str, on_pr: Callable=None) -> dict:
 
     if ':' not in uri:
         if not bitcoin.is_address(uri):
-            raise Exception("Not a bitcoin address")
+            raise Exception("Not a FLO address")
         return {'address': uri}
 
     u = urllib.parse.urlparse(uri)
     if u.scheme != 'bitcoin':
-        raise Exception("Not a bitcoin URI")
+        raise Exception("Not a FLO URI")
     address = u.path
 
     # python for android fails to parse query
@@ -737,7 +737,7 @@ def parse_URI(uri: str, on_pr: Callable=None) -> dict:
     out = {k: v[0] for k, v in pq.items()}
     if address:
         if not bitcoin.is_address(address):
-            raise Exception("Invalid bitcoin address:" + address)
+            raise Exception("Invalid FLO address:" + address)
         out['address'] = address
     if 'amount' in out:
         am = out['amount']
@@ -786,7 +786,7 @@ def create_URI(addr, amount, message):
         query.append('amount=%s'%format_satoshis_plain(amount))
     if message:
         query.append('message=%s'%urllib.parse.quote(message))
-    p = urllib.parse.ParseResult(scheme='bitcoin', netloc='', path=addr, params='', query='&'.join(query), fragment='')
+    p = urllib.parse.ParseResult(scheme='flo', netloc='', path=addr, params='', query='&'.join(query), fragment='')
     return urllib.parse.urlunparse(p)
 
 
@@ -917,6 +917,7 @@ class TxMinedInfo(NamedTuple):
     timestamp: Optional[int] = None    # timestamp of block that mined tx
     txpos: Optional[int] = None        # position of tx in serialized block
     header_hash: Optional[str] = None  # hash of block that mined tx
+    flodata: Optional[str] = None      # flodata of the tx
 
 
 def make_aiohttp_session(proxy: dict, headers=None, timeout=None):

electrum/verifier.py

@@ -124,10 +124,12 @@ class SPV(NetworkJobOnDefaultServer):
         except KeyError: pass
         self.print_error("verified %s" % tx_hash)
         header_hash = hash_header(header)
+        flodata = self.wallet.get_flodata(tx_hash)
         tx_info = TxMinedInfo(height=tx_height,
                               timestamp=header.get('timestamp'),
                               txpos=pos,
-                              header_hash=header_hash)
+                              header_hash=header_hash,
+                              flodata=flodata)
         self.wallet.add_verified_tx(tx_hash, tx_info)
         if self.is_up_to_date() and self.wallet.is_up_to_date():
             self.wallet.save_verified_tx(write=True)

electrum/wallet.py

@@ -603,7 +603,7 @@ class Abstract_Wallet(AddressSynchronizer):
         return candidate
 
     def make_unsigned_transaction(self, coins, outputs, config, fixed_fee=None,
-                                  change_addr=None, is_sweep=False):
+                                  change_addr=None, is_sweep=False, flodata=None):
         # check outputs
         i_max = None
         for i, o in enumerate(outputs):
@@ -621,6 +621,9 @@ class Abstract_Wallet(AddressSynchronizer):
         for item in coins:
             self.add_input_info(item)
 
+        if flodata is None:
+            flodata=''
+
         # change address
         # if we leave it empty, coin_chooser will set it
         change_addrs = []
@@ -693,6 +696,10 @@ class Abstract_Wallet(AddressSynchronizer):
 
         # Timelock tx to current height.
         tx.locktime = self.get_local_height()
+        # Transactions with transaction comments/floData are version 2
+        if flodata != "":
+            tx.version = 2
+            tx.flodata = "text:" + flodata
         run_hook('make_unsigned_transaction', self, tx)
         return tx
 
@@ -962,7 +969,7 @@ class Abstract_Wallet(AddressSynchronizer):
         if not r:
             return
         out = copy.copy(r)
-        out['URI'] = 'bitcoin:' + addr + '?amount=' + format_satoshis(out.get('amount'))
+        out['URI'] = 'flo:' + addr + '?amount=' + format_satoshis(out.get('amount'))
         status, conf = self.get_request_status(addr)
         out['status'] = status
         if conf is not None: