From dae88c707b050deffeb8520604c90c7f9ea5f3de Mon Sep 17 00:00:00 2001
From: Veselin Penev <penev.veselin@gmail.com>
Date: Fri, 29 Mar 2024 09:19:35 +0100
Subject: [PATCH 1/2] updated bitdust/customer/payment.py

---
 bitdust/blockchain/bismuth_miner.py           |  14 +-
 bitdust/blockchain/bismuth_wallet.py          |  11 +-
 bitdust/customer/payment.py                   | 120 +++++++++++++++++-
 bitdust/customer/supplier_connector.py        |  41 +-----
 bitdust/interface/api.py                      |  12 +-
 bitdust/interface/cmd_line_json.py            |   1 +
 bitdust/lib/utime.py                          |   6 +
 .../services/service_customer_contracts.py    |   2 +-
 bitdust/userid/id_url.py                      |   2 +-
 9 files changed, 139 insertions(+), 70 deletions(-)

diff --git a/bitdust/blockchain/bismuth_miner.py b/bitdust/blockchain/bismuth_miner.py
index 1ecea6606..7d59ba86d 100644
--- a/bitdust/blockchain/bismuth_miner.py
+++ b/bitdust/blockchain/bismuth_miner.py
@@ -5,7 +5,6 @@
 import socks
 import hashlib
 import random
-import traceback
 
 #------------------------------------------------------------------------------
 
@@ -95,11 +94,8 @@ def check_start_mining():
     global _OwnCoinsLastTime
     global _WantMoreCoins
     global _MiningIsOn
-    try:
-        cur_balance = bismuth_wallet.my_balance()
-    except:
-        traceback.print_exc()
-        cur_balance = 'N/A'
+
+    cur_balance = bismuth_wallet.my_balance()
 
     lg.info('my wallet address is %s and current balance is %s' % (bismuth_wallet.my_wallet_address(), cur_balance))
     if _Debug:
@@ -108,11 +104,7 @@ def check_start_mining():
     if cur_balance == 'N/A':
         reactor.callLater(10, check_start_mining)  # @UndefinedVariable
         return
-    try:
-        cur_balance = float(cur_balance)
-    except:
-        reactor.callLater(10, check_start_mining)  # @UndefinedVariable
-        return
+
     if _WantMoreCoins and (not _OwnCoinsLastTime or (time.time() - _OwnCoinsLastTime > 60)):
         _OwnCoinsLastTime = time.time()
         _WantMoreCoins = False
diff --git a/bitdust/blockchain/bismuth_wallet.py b/bitdust/blockchain/bismuth_wallet.py
index c89e7eae2..fa10c6c29 100644
--- a/bitdust/blockchain/bismuth_wallet.py
+++ b/bitdust/blockchain/bismuth_wallet.py
@@ -125,17 +125,24 @@ def my_wallet_address():
 
 
 def my_balance():
-    return client().balance()
+    try:
+        _balance = float(client().balance())
+    except:
+        lg.exc()
+        return 'N/A'
+    return _balance
 
 
 def latest_transactions(num, offset, for_display, mempool_included):
     return client().latest_transactions(num, offset, for_display, mempool_included)
 
 
-def send_transaction(recipient, amount, operation='', data=''):
+def send_transaction(recipient, amount, operation='', data='', raise_errors=False):
     error_reply = []
     ret = client().send(recipient=recipient, amount=amount, operation=operation, data=data, error_reply=error_reply)
     if not ret:
+        if raise_errors:
+            raise Exception(error_reply)
         return error_reply
     return ret
 
diff --git a/bitdust/customer/payment.py b/bitdust/customer/payment.py
index 7f9a7f4e7..7301ff3e9 100644
--- a/bitdust/customer/payment.py
+++ b/bitdust/customer/payment.py
@@ -31,21 +31,87 @@
 
 #------------------------------------------------------------------------------
 
+import os
+
+#------------------------------------------------------------------------------
+
 from bitdust.logs import lg
 
 from bitdust.lib import utime
+from bitdust.lib import strng
+from bitdust.lib import jsn
+
+from bitdust.system import bpio
+from bitdust.system import local_fs
+
+from bitdust.main import settings
+
+from bitdust.crypt import key
+
+from bitdust.blockchain import bismuth_wallet
+
+from bitdust.userid import id_url
+
+#------------------------------------------------------------------------------
+
+
+def get_supplier_contracts_dir(supplier_idurl):
+    supplier_idurl = id_url.field(supplier_idurl)
+    supplier_contracts_prefix = '{}_{}'.format(
+        supplier_idurl.username,
+        strng.to_text(key.HashSHA(supplier_idurl.to_public_key(), hexdigest=True)),
+    )
+    return os.path.join(settings.ServiceDir('service_customer_contracts'), supplier_contracts_prefix)
+
+
+def save_storage_contract(supplier_idurl, json_data):
+    supplier_contracts_dir = get_supplier_contracts_dir(supplier_idurl)
+    if not os.path.isdir(supplier_contracts_dir):
+        bpio._dirs_make(supplier_contracts_dir)
+    contract_path = os.path.join(supplier_contracts_dir, str(utime.unpack_time(json_data['started'])))
+    json_data['supplier'] = supplier_idurl
+    local_fs.WriteTextFile(contract_path, jsn.dumps(json_data))
+    return contract_path
+
+
+def list_storage_contracts(supplier_idurl):
+    supplier_contracts_dir = get_supplier_contracts_dir(supplier_idurl)
+    if not os.path.isdir(supplier_contracts_dir):
+        return []
+    l = []
+    for contract_filename in os.listdir(supplier_contracts_dir):
+        contract_path = os.path.join(supplier_contracts_dir, contract_filename)
+        json_data = jsn.loads_text(local_fs.ReadTextFile(contract_path))
+        l.append(json_data)
+    return l
+
 
-from bitdust.contacts import contactsdb
+def list_contracted_suppliers():
+    supplier_idurls = []
+    for supplier_contracts_prefix in os.listdir(settings.ServiceDir('service_customer_contracts')):
+        supplier_contracts_dir = os.path.join(settings.ServiceDir('service_customer_contracts'), supplier_contracts_prefix)
+        for contract_filename in os.listdir(supplier_contracts_dir):
+            contract_path = os.path.join(supplier_contracts_dir, contract_filename)
+            json_data = jsn.loads_text(local_fs.ReadTextFile(contract_path))
+            supplier_idurl = json_data.get('supplier', None)
+            if supplier_idurl:
+                if not id_url.is_in(supplier_idurl, supplier_idurls):
+                    supplier_idurls.append(supplier_idurl)
+                break
+    return supplier_idurls
 
-from bitdust.customer import supplier_connector
 
 #------------------------------------------------------------------------------
 
 
 def pay_for_storage():
+    cur_balance = bismuth_wallet.my_balance()
+    if cur_balance == 'N/A':
+        lg.err('my current balance is not available, payments are not possible at the moment')
+        return False
     now = utime.utcnow_to_sec1970()
-    for supplier_idurl in contactsdb.suppliers():
-        supplier_contracts = supplier_connector.list_storage_contracts(supplier_idurl)
+    for supplier_idurl in list_contracted_suppliers():
+        supplier_contracts = list_storage_contracts(supplier_idurl)
         unpaid_contracts = []
         for json_data in supplier_contracts:
             if json_data.get('paid'):
@@ -53,12 +119,52 @@ def pay_for_storage():
             if now < utime.unpack_time(json_data['complete_after']):
                 continue
             unpaid_contracts.append(json_data)
+        sum_to_pay = 0
+        pay_before_earliest = None
+        pay_before_latest = None
+        supplier_wallet_address = None
+        started = None
+        complete_after = None
         if unpaid_contracts:
             unpaid_contracts.sort(key=lambda i: utime.unpack_time(i['started']))
+            started = unpaid_contracts[0]['started']
+            complete_after = unpaid_contracts[-1]['complete_after']
             pay_before_earliest = utime.unpack_time(unpaid_contracts[0]['pay_before'])
             pay_before_latest = utime.unpack_time(unpaid_contracts[-1]['pay_before'])
-            sum_to_pay = 0
+            supplier_wallet_address = unpaid_contracts[-1]['wallet_address']
             for unpaid_contract in unpaid_contracts:
                 sum_to_pay += unpaid_contract['value']
-            if _Debug:
-                lg.args(_DebugLevel, s=supplier_idurl, to_pay=sum_to_pay, pay_before_earliest=utime.pack_time(pay_before_earliest), pay_before_latest=utime.pack_time(pay_before_latest))
+        if _Debug:
+            lg.args(
+                _DebugLevel,
+                s=supplier_idurl,
+                unpaid=len(unpaid_contracts),
+                debt=sum_to_pay,
+                pay_earliest=utime.pack_time(pay_before_earliest),
+                pay_latest=utime.pack_time(pay_before_latest),
+                started=started,
+                complete_after=complete_after,
+            )
+        if sum_to_pay:
+            if now > pay_before_earliest:
+                if sum_to_pay >= cur_balance:
+                    lg.warn('my current balance %r is not enough to pay %r to %r' % (cur_balance, sum_to_pay, supplier_idurl))
+                    continue
+                try:
+                    ret = bismuth_wallet.send_transaction(
+                        recipient=supplier_wallet_address,
+                        amount=sum_to_pay,
+                        operation='storage',
+                        data='{} {}'.format(started, complete_after),
+                        raise_errors=True,
+                    )
+                except:
+                    lg.exc()
+                    return False
+                if _Debug:
+                    lg.args(_DebugLevel, recipient=supplier_wallet_address, ret=ret)
+                cur_balance = bismuth_wallet.my_balance()
+                if cur_balance == 'N/A':
+                    lg.err('my current balance is not available, payments are not possible at the moment')
+                    return False
+    return True
diff --git a/bitdust/customer/supplier_connector.py b/bitdust/customer/supplier_connector.py
index 93af43363..a087e9d2f 100644
--- a/bitdust/customer/supplier_connector.py
+++ b/bitdust/customer/supplier_connector.py
@@ -68,7 +68,6 @@
 from bitdust.automats import automat
 
 from bitdust.system import bpio
-from bitdust.system import local_fs
 
 from bitdust.main import settings
 from bitdust.main import events
@@ -76,11 +75,8 @@
 from bitdust.lib import strng
 from bitdust.lib import nameurl
 from bitdust.lib import diskspace
-from bitdust.lib import utime
 from bitdust.lib import jsn
 
-from bitdust.crypt import key
-
 from bitdust.contacts import contactsdb
 
 from bitdust.services import driver
@@ -93,6 +89,8 @@
 
 from bitdust.storage import accounting
 
+from bitdust.customer import payment
+
 from bitdust.userid import id_url
 from bitdust.userid import global_id
 from bitdust.userid import my_id
@@ -167,39 +165,6 @@ def total_connectors():
 #------------------------------------------------------------------------------
 
 
-def get_supplier_contracts_dir(supplier_idurl):
-    supplier_idurl = id_url.field(supplier_idurl)
-    supplier_contracts_prefix = '{}_{}'.format(
-        supplier_idurl.username,
-        strng.to_text(key.HashSHA(supplier_idurl.to_public_key(), hexdigest=True)),
-    )
-    return os.path.join(settings.ServiceDir('service_customer_contracts'), supplier_contracts_prefix)
-
-
-def save_storage_contract(supplier_idurl, json_data):
-    supplier_contracts_dir = get_supplier_contracts_dir(supplier_idurl)
-    if not os.path.isdir(supplier_contracts_dir):
-        bpio._dirs_make(supplier_contracts_dir)
-    contract_path = os.path.join(supplier_contracts_dir, str(utime.unpack_time(json_data['started'])))
-    local_fs.WriteTextFile(contract_path, jsn.dumps(json_data))
-    return contract_path
-
-
-def list_storage_contracts(supplier_idurl):
-    supplier_contracts_dir = get_supplier_contracts_dir(supplier_idurl)
-    if not os.path.isdir(supplier_contracts_dir):
-        return []
-    l = []
-    for contract_filename in os.listdir(supplier_contracts_dir):
-        contract_path = os.path.join(supplier_contracts_dir, contract_filename)
-        json_data = jsn.loads_text(local_fs.ReadTextFile(contract_path))
-        l.append(json_data)
-    return l
-
-
-#------------------------------------------------------------------------------
-
-
 class SupplierConnector(automat.Automat):
     """
     This class implements all the functionality of the ``supplier_connector()``
@@ -667,7 +632,7 @@ def _supplier_service_acked(self, response, info):
                     self.latest_supplier_ack = None
                     self.automat('fail', None)
                     return
-                save_storage_contract(self.supplier_idurl, the_contract)
+                payment.save_storage_contract(self.supplier_idurl, the_contract)
         self.automat('ack', response)
 
     def _supplier_service_failed(self, response, info):
diff --git a/bitdust/interface/api.py b/bitdust/interface/api.py
index b8845d232..01951e11b 100644
--- a/bitdust/interface/api.py
+++ b/bitdust/interface/api.py
@@ -5846,11 +5846,7 @@ def blockchain_info():
         }
     if driver.is_on('service_bismuth_wallet'):
         from bitdust.blockchain import bismuth_wallet
-        try:
-            cur_balance = bismuth_wallet.my_balance()
-        except:
-            lg.exc()
-            cur_balance = 'N/A'
+        cur_balance = bismuth_wallet.my_balance()
         ret['wallet'] = {
             'balance': cur_balance,
             'address': bismuth_wallet.my_wallet_address(),
@@ -5878,11 +5874,7 @@ def blockchain_wallet_balance():
     if not driver.is_on('service_bismuth_wallet'):
         return ERROR('service_bismuth_wallet() is not started')
     from bitdust.blockchain import bismuth_wallet
-    try:
-        cur_balance = bismuth_wallet.my_balance()
-    except:
-        lg.exc()
-        cur_balance = 'N/A'
+    cur_balance = bismuth_wallet.my_balance()
     return OK({
         'balance': cur_balance,
         'address': bismuth_wallet.my_wallet_address(),
diff --git a/bitdust/interface/cmd_line_json.py b/bitdust/interface/cmd_line_json.py
index 102815dd4..b14d8c971 100644
--- a/bitdust/interface/cmd_line_json.py
+++ b/bitdust/interface/cmd_line_json.py
@@ -768,6 +768,7 @@ def cmd_api(opts, args, overDict, executablePath):
                 'jsn',
                 'json',
                 'gc',
+                'config',
             ]:
                 continue
             method = getattr(api, item, None)
diff --git a/bitdust/lib/utime.py b/bitdust/lib/utime.py
index 8fd6bb915..c5e05677d 100644
--- a/bitdust/lib/utime.py
+++ b/bitdust/lib/utime.py
@@ -77,6 +77,8 @@ def sec1970_to_datetime_utc(seconds=-1):
     """
     Converts seconds since 1970 year to datetime object in UTC form.
     """
+    if seconds is None:
+        return None
     if seconds == -1:
         seconds = utcnow_to_sec1970()
     return datetime.datetime.utcfromtimestamp(seconds)
@@ -114,6 +116,8 @@ def pack_time(seconds=-1, timespec='seconds'):
     """
     Converts seconds since 1970 year to ISO formatted string.
     """
+    if seconds is None:
+        return None
     return sec1970_to_datetime_utc(seconds).isoformat(timespec=timespec)
 
 
@@ -121,4 +125,6 @@ def unpack_time(text):
     """
     Converts ISO formatted string to seconds since 1970 year.
     """
+    if text is None:
+        return None
     return datetime_to_sec1970(_fromisoformat(text))
diff --git a/bitdust/services/service_customer_contracts.py b/bitdust/services/service_customer_contracts.py
index 2177cdb42..8ecdc733c 100644
--- a/bitdust/services/service_customer_contracts.py
+++ b/bitdust/services/service_customer_contracts.py
@@ -51,7 +51,7 @@ def dependent_on(self):
     def start(self):
         from twisted.internet import task  # @UnresolvedImport
         self.payment_loop = task.LoopingCall(self.on_payment_task)
-        self.payment_loop.start(60*60)
+        self.payment_loop.start(60*60, now=True)
         return True
 
     def stop(self):
diff --git a/bitdust/userid/id_url.py b/bitdust/userid/id_url.py
index 770b9fa70..833094c77 100644
--- a/bitdust/userid/id_url.py
+++ b/bitdust/userid/id_url.py
@@ -903,7 +903,7 @@ def __hash__(self):
     def __repr__(self):
         if _Debug:
             lg.args(_DebugLevel*2, latest_as_string=self.latest_as_string)
-        return '[%s%s]' % ('' if self.is_latest() else '*', self.latest_as_string)
+        return '{%s%s}' % ('' if self.is_latest() else '*', self.latest_as_string)
 
     def __str__(self):
         if _Debug:

From cebbb4eba2bf083c3aa3570c03f16ae6464d7c4c Mon Sep 17 00:00:00 2001
From: Veselin Penev <penev.veselin@gmail.com>
Date: Sun, 31 Mar 2024 22:59:43 +0200
Subject: [PATCH 2/2] built new service_blockchain_explorer() and updated
 id_server.py with new HTML template

---
 .style.yapf                                   |   2 +
 bitdust/blockchain/bismuth_node.py            |   1 +
 bitdust/blockchain/blockchain_explorer.py     | 396 ++++++++++++++++++
 bitdust/customer/supplier_connector.py        |   3 +-
 bitdust/interface/web_html_template.py        | 204 +++++++++
 bitdust/main/config_defaults.py               |   4 +
 bitdust/main/config_types.py                  |   4 +-
 .../services/service_blockchain_explorer.py   |  59 +++
 bitdust/userid/id_server.py                   | 108 ++++-
 bitdust_forks/Bismuth/apihandler.py           |   2 +-
 bitdust_forks/Bismuth/dbhandler.py            |   2 +-
 bitdust_forks/Bismuth/worker.py               |   6 +-
 tests/test_id_url.py                          |  30 +-
 13 files changed, 787 insertions(+), 34 deletions(-)
 create mode 100644 bitdust/blockchain/blockchain_explorer.py
 create mode 100644 bitdust/interface/web_html_template.py
 create mode 100644 bitdust/services/service_blockchain_explorer.py

diff --git a/.style.yapf b/.style.yapf
index 13eb3febd..3e0cd3af9 100644
--- a/.style.yapf
+++ b/.style.yapf
@@ -3,6 +3,8 @@ based_on_style=facebook
 column_limit=240
 indent_width=4
 continuation_indent_width=4
+blank_line_before_class_docstring=True
+blank_line_before_nested_class_or_def=True
 blank_lines_around_top_level_definition=2
 blank_lines_between_top_level_imports_and_variables=1
 no_spaces_around_selected_binary_operators=*,/
diff --git a/bitdust/blockchain/bismuth_node.py b/bitdust/blockchain/bismuth_node.py
index b4d247441..cced5e4d7 100644
--- a/bitdust/blockchain/bismuth_node.py
+++ b/bitdust/blockchain/bismuth_node.py
@@ -521,6 +521,7 @@ def check_db_for_bootstrap(node):
 
 
 class CustomLogHandler(logging.Handler):
+
     def emit(self, record):
         try:
             if _Debug:
diff --git a/bitdust/blockchain/blockchain_explorer.py b/bitdust/blockchain/blockchain_explorer.py
new file mode 100644
index 000000000..67f8fe670
--- /dev/null
+++ b/bitdust/blockchain/blockchain_explorer.py
@@ -0,0 +1,396 @@
+import sys
+import time
+import sqlite3
+import base64
+
+#------------------------------------------------------------------------------
+
+if __name__ == '__main__':
+    import os.path as _p
+    sys.path.insert(0, _p.abspath(_p.join(_p.dirname(_p.abspath(sys.argv[0])), '..')))
+    src_dir_path = _p.dirname(_p.dirname(_p.dirname(_p.abspath(sys.argv[0]))))
+    sys.path.insert(0, src_dir_path)
+    sys.path.insert(0, _p.join(src_dir_path, 'bitdust_forks', 'Bismuth'))
+
+#------------------------------------------------------------------------------
+
+from twisted.internet import reactor
+from twisted.web import server, resource
+
+#------------------------------------------------------------------------------
+
+from bitdust.logs import lg
+
+from bitdust.lib import strng
+
+from bitdust.main import settings
+from bitdust.main import config
+
+from bitdust.interface import web_html_template
+
+from bitdust.blockchain import bismuth_node
+
+#------------------------------------------------------------------------------
+
+_Debug = True
+_DebugLevel = 10
+
+#------------------------------------------------------------------------------
+
+_DataDirPath = None
+_ExplorerHost = None
+_ExplorerPort = None
+_WebListener = None
+
+#------------------------------------------------------------------------------
+
+
+def init():
+    global _DataDirPath
+    global _ExplorerHost
+    global _ExplorerPort
+    global _WebListener
+
+    _DataDirPath = settings.ServiceDir('bismuth_blockchain')
+    _ExplorerHost = config.conf().getString('services/blockchain-explorer/host', '127.0.0.1')
+    _ExplorerPort = config.conf().getInt('services/blockchain-explorer/web-port', 19080)
+
+    root = BlockchainRootPage()
+    root.putChild(b'', BlockchainMainPage())
+    try:
+        _WebListener = reactor.listenTCP(_ExplorerPort, server.Site(root))  # @UndefinedVariable
+        if _Debug:
+            lg.out(_DebugLevel, '            have started web server at port %d   hostname=%s' % (_ExplorerPort, strng.to_text(_ExplorerHost)))
+    except:
+        if _Debug:
+            lg.err('exception while trying to listen port ' + str(self.web_port))
+        lg.exc()
+    if _Debug:
+        lg.args(_DebugLevel, data_dir_path=_DataDirPath)
+    return True
+
+
+def shutdown():
+    global _WebListener
+    if _Debug:
+        lg.dbg(_DebugLevel, '')
+    if _WebListener:
+        _WebListener.stopListening()
+        if _Debug:
+            lg.out(_DebugLevel, '            stopped web listener')
+    _WebListener = None
+    return True
+
+
+#------------------------------------------------------------------------------
+
+
+def execute(cursor, query, param):
+    while True:
+        try:
+            cursor.execute(query, param)
+            break
+        except Exception as e:
+            print('Database query: {} {}'.format(cursor, query))
+            print('Database retry reason: {}'.format(e))
+            time.sleep(0.2)
+    return cursor
+
+
+#------------------------------------------------------------------------------
+
+
+class BlockchainMainPage(resource.Resource):
+
+    def render_GET(self, request):
+        global _ExplorerHost
+
+        page_size = 500
+
+        page_num = request.args.get(b'page', [])
+        if page_num:
+            try:
+                page_num = int(strng.to_text(page_num[0]))
+            except:
+                lg.exc()
+                page_num = 0
+        else:
+            page_num = 0
+
+        page_max = -1
+
+        src = ''
+
+        conn = sqlite3.connect(bismuth_node.nod().ledger_path, timeout=60.0)
+        c = conn.cursor()
+        execute(c, 'SELECT * FROM transactions ORDER BY block_height DESC, timestamp DESC LIMIT ? OFFSET ?;', (
+            page_size,
+            page_size*page_num,
+        ))
+        _all = c.fetchall()
+        c.close()
+        conn.close()
+        conn = None
+        c = None
+
+        view = []
+        b = -1
+        x_old = 'init'
+
+        for x in _all:
+            if int(x[0]) == 1:
+                page_max = page_num
+
+            if x[0] != x_old:
+                color_cell = '#F8F8F8'
+                view.append('<tr><td>&nbsp;</td></tr>')  #block separator
+            else:
+                color_cell = 'white'
+
+            view.append('<tr bgcolor ={}>'.format(color_cell))
+
+            if x[0] != x_old:
+                b = b + 1
+
+            if x_old != x[0]:
+                view.append('<td>{}</td>'.format(x[0]))  #block height
+            else:
+                view.append('<td>{}</td>'.format(x[0]))  #block height
+
+            view.append('<td>{}'.format(time.strftime('%Y/%m/%d %H:%M:%S', time.gmtime(float(x[1])))))
+            view.append('<td>{}&hellip;</td>'.format(x[2][:6]))  #from
+            view.append('<td>{}&hellip;</td>'.format(x[3][:6]))  #to
+            view.append('<td>{0:g}</td>'.format(float(x[4])))  #amount
+
+            if x_old != x[0]:
+                view.append('<td>{}&hellip;</td>'.format(x[7][:6]))  #block hash
+            else:
+                view.append('<td>&nbsp;</td>')  #block hash
+
+            view.append('<td>{0:g}</td>'.format(float(x[8])))  #fee
+            view.append('<td>{0:g}</td>'.format(float(x[9])))  #reward
+
+            view.append('<td>{}{}</td>'.format(x[10][:16], '&hellip;' if len(x[10]) > 16 else ''))  #operation
+            view.append('<td>{}{}</td>'.format(x[11][:24], '&hellip;' if len(x[11]) > 24 else ''))  #openfield
+
+            view.append('<td><a href="/{}">{}&hellip;</a></td>'.format(
+                strng.to_text(base64.b64encode(strng.to_bin(x[5]), altchars=b'-_')),
+                x[5][:6],
+            ))  #TXID
+
+            view.append('</tr>')
+
+            x_old = x[0]
+
+        src += '<div id="ui-blockchain-explorer" class="section bg-light">'
+        src += '<div class="container">\n'
+        src += '<div class="ui-card">\n'
+        src += '<div class="card-body">\n'
+
+        src += '<div class="row justify-content-center">\n'
+        src += '<h1 align=center>BitDust blockchain explorer</h1>\n'
+        src += '</div>\n'
+
+        src += '<div class="row justify-content-center">\n'
+        src += '<ul class="pagination pagination-sm">\n'
+        src += '<li class="page-item">\n'
+        src += '<a class="page-link" href="/?page={}">\n'.format(max(0, page_num - 1))
+        src += '<span aria-hidden="true">&laquo;</span>\n'
+        src += '</a>\n'
+        src += '</li>\n'
+        src += '<li class="page-item">\n'
+        src += '<a class="page-link" href="/?page={}">\n'.format(min(page_max, page_num + 1))
+        src += '<span aria-hidden="true">&raquo;</span>\n'
+        src += '</a>\n'
+        src += '</li>\n'
+        src += '</ul>\n'
+        src += '</div>\n'
+
+        src += '<div class="row justify-content-center">\n'
+
+        src += '<style type="text/css">#blockchain-table td {padding: 0px 5px; font-size: 0.9em; font-family: monospace, monospace; }</style>'
+
+        src += '<table id="blockchain-table" class="table table-responsive">\n'
+
+        src += '<tr bgcolor=white>\n'
+        src += '<td><b>Block</b></td>\n'
+        src += '<td><b>Timestamp</b></td>\n'
+        src += '<td><b>From</b></td>\n'
+        src += '<td><b>To</b></td>\n'
+        src += '<td><b>Amount</b></td>\n'
+        src += '<td><b>Hash</b></td>\n'
+        src += '<td><b>Fee</b></td>\n'
+        src += '<td><b>Reward</b></td>\n'
+        src += '<td><b>Operation</b></td>\n'
+        src += '<td><b>Openfield</b></td>\n'
+        src += '<td><b>TXID</b></td>\n'
+        src += '</tr>\n'
+
+        src += ''.join(view)
+
+        src += '</table>\n'
+        src += '</div>\n'
+
+        src += '<br>\n'
+        src += '<div class="row justify-content-center">\n'
+        src += '<ul class="pagination pagination-sm">\n'
+        src += '<li class="page-item">\n'
+        src += '<a class="page-link" href="/?page={}">\n'.format(max(0, page_num - 1))
+        src += '<span aria-hidden="true">&laquo;</span>\n'
+        src += '</a>\n'
+        src += '</li>\n'
+        src += '<li class="page-item">\n'
+        src += '<a class="page-link" href="/?page={}">\n'.format(min(page_max, page_num + 1))
+        src += '<span aria-hidden="true">&raquo;</span>\n'
+        src += '</a>\n'
+        src += '</li>\n'
+        src += '</ul>\n'
+        src += '</div>\n'
+
+        src += '</div>\n'
+        src += '</div>\n'
+        src += '</div>\n'
+        src += '</div>\n'
+
+        html_src = web_html_template.WEB_ROOT_TEMPLATE % dict(
+            title='BitDust blockchain explorer',
+            site_url='https://bitdust.io',
+            basepath='https://bitdust.io/',
+            wikipath='https://bitdust.io/wiki/',
+            idserverspath='https://identities.bitdust.io/',
+            blockchainpath='https://blockchain.bitdust.io/',
+            div_main_class='main blockchain',
+            div_main_body=src,
+            google_analytics='',
+        )
+        return strng.to_bin(html_src)
+
+
+#------------------------------------------------------------------------------
+
+
+class BlockchainTransactionPage(resource.Resource):
+
+    def __init__(self, tx_id):
+        resource.Resource.__init__(self)
+        self.tx_id = tx_id
+
+    def render_GET(self, request):
+        src = ''
+        src += '<div id="ui-blockchain-transaction" class="section bg-light">'
+        src += '<div class="container">\n'
+        src += '<div class="ui-card">\n'
+        src += '<div class="card-body">\n'
+
+        try:
+            _t = strng.to_text(base64.b64decode(self.tx_id, altchars='-_'))
+        except:
+            src += '<p align=center>invalid transaction ID</p>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+            html_src = web_html_template.WEB_ROOT_TEMPLATE % dict(
+                title='BitDust blockchain explorer',
+                site_url='https://bitdust.io',
+                basepath='https://bitdust.io/',
+                wikipath='https://bitdust.io/wiki/',
+                idserverspath='https://identities.bitdust.io/',
+                blockchainpath='https://blockchain.bitdust.io/',
+                div_main_class='main blockchain-transaction',
+                div_main_body=src,
+                google_analytics='',
+            )
+            return strng.to_bin(html_src)
+
+        try:
+            conn = sqlite3.connect(bismuth_node.nod().ledger_path, timeout=60.0)
+            c = conn.cursor()
+            execute(c, 'SELECT * FROM transactions WHERE substr(signature,1,4)=substr(?1,1,4) and signature like ?1;', (_t + '%', ))
+            raw = c.fetchone()
+            c.close()
+            conn.close()
+            conn = None
+            c = None
+        except:
+            src += '<p align=center>reading failed</p>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+            html_src = web_html_template.WEB_ROOT_TEMPLATE % dict(
+                title='BitDust blockchain explorer',
+                site_url='https://bitdust.io',
+                basepath='https://bitdust.io/',
+                wikipath='https://bitdust.io/wiki/',
+                idserverspath='https://identities.bitdust.io/',
+                blockchainpath='https://blockchain.bitdust.io/',
+                div_main_class='main blockchain-transaction',
+                div_main_body=src,
+                google_analytics='',
+            )
+            return strng.to_bin(html_src)
+
+        src += '<div>block: <b>{}</b></div><br>\n'.format(raw[0])
+        src += '<div>block hash: <b><code>{}</code></b></div><br>\n'.format(raw[7])
+        src += '<div>timestamp: <b>{}</b></div><br>\n'.format(time.strftime('%Y/%m/%d %H:%M:%S', time.gmtime(float(raw[1]))))
+        src += '<div>sender: <b><code>{}</code></b></div><br>\n'.format(raw[2])
+        src += '<div>recipient: <b><code>{}</code></b></div><br>\n'.format(raw[3])
+        src += '<div>amount: <b>{0:g}</b></div><br>\n'.format(raw[4])
+        src += '<div>fee: <b>{0:g}</b></div><br>\n'.format(raw[8])
+        src += '<div>reward: <b>{0:g}</b></div><br>\n'.format(raw[9])
+        src += '<div>operation: <b>{}</b></div><br>\n'.format(raw[10])
+        src += '<div style="margin: 0 auto; overflow-wrap: break-word; word-wrap: break-word;">openfield: <b><code>{}</code></b></div>\n'.format(raw[11])
+        src += '<div style="margin: 0 auto; overflow-wrap: break-word; word-wrap: break-word;">signature:\n<b><code>{}</code></b></div><br>\n'.format(self.tx_id)
+        src += '</div>\n'
+        src += '</div>\n'
+        src += '</div>\n'
+        src += '</div>\n'
+
+        html_src = web_html_template.WEB_ROOT_TEMPLATE % dict(
+            title='BitDust blockchain explorer',
+            site_url='https://bitdust.io',
+            basepath='https://bitdust.io/',
+            wikipath='https://bitdust.io/wiki/',
+            idserverspath='https://identities.bitdust.io/',
+            blockchainpath='https://blockchain.bitdust.io/',
+            div_main_class='main blockchain-transaction',
+            div_main_body=src,
+            google_analytics='',
+        )
+        return strng.to_bin(html_src)
+
+
+#------------------------------------------------------------------------------
+
+
+class BlockchainRootPage(resource.Resource):
+
+    def getChild(self, path, request):
+        if not path:
+            return self
+        try:
+            path = strng.to_text(path)
+        except:
+            return resource.NoResource('Not found')
+        if path:
+            return BlockchainTransactionPage(path)
+        return resource.NoResource('Not found')
+
+
+#------------------------------------------------------------------------------
+
+
+def main():
+    bismuth_node.init()
+    settings.init()
+    reactor.addSystemEventTrigger('before', 'shutdown', shutdown)  # @UndefinedVariable
+    reactor.callWhenRunning(init)  # @UndefinedVariable
+    reactor.run()  # @UndefinedVariable
+    settings.shutdown()
+
+
+#------------------------------------------------------------------------------
+
+if __name__ == '__main__':
+    main()
diff --git a/bitdust/customer/supplier_connector.py b/bitdust/customer/supplier_connector.py
index a087e9d2f..662174776 100644
--- a/bitdust/customer/supplier_connector.py
+++ b/bitdust/customer/supplier_connector.py
@@ -89,8 +89,6 @@
 
 from bitdust.storage import accounting
 
-from bitdust.customer import payment
-
 from bitdust.userid import id_url
 from bitdust.userid import global_id
 from bitdust.userid import my_id
@@ -632,6 +630,7 @@ def _supplier_service_acked(self, response, info):
                     self.latest_supplier_ack = None
                     self.automat('fail', None)
                     return
+                from bitdust.customer import payment
                 payment.save_storage_contract(self.supplier_idurl, the_contract)
         self.automat('ack', response)
 
diff --git a/bitdust/interface/web_html_template.py b/bitdust/interface/web_html_template.py
new file mode 100644
index 000000000..7353c0b59
--- /dev/null
+++ b/bitdust/interface/web_html_template.py
@@ -0,0 +1,204 @@
+WEB_ROOT_TEMPLATE = """<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="msapplication-TileColor" content="#da532c">
+    <meta name="theme-color" content="#ffffff">
+    <meta property="og:image:width" content="2400">
+    <meta property="og:image:height" content="1257">
+    <meta property="og:title" content="%(title)s">
+    <meta property="og:description"
+          content="Distributed secure anonymous on-line storage, where only the owner has access and absolute control over its data.">
+    <meta property="og:url" content="%(site_url)s">
+    <meta property="og:image" content="%(basepath)sassets/img/og/og-image.jpg">
+
+    <title data-content="pageTitle">%(title)s</title>
+
+    <link rel="apple-touch-icon" sizes="180x180" href="%(basepath)slogos/logo-pictogram-color.png"/>
+    <link rel="icon" type="image/png" sizes="32x32" href="%(basepath)slogos/logo-pictogram-color.png"/>
+    <link rel="icon" type="image/png" sizes="16x16" href="%(basepath)slogos/logo-pictogram-color.png"/>
+    <link rel="manifest" href="%(basepath)ssite.webmanifest"/>
+    <link rel="mask-icon" href="%(basepath)slogos/logo-pictogram-color.svg" color="#5bbad5"/>
+    <link rel="stylesheet" href="%(basepath)scss/font_sans_pro_600_700.css" type="text/css"/>
+    <link rel="stylesheet" href="%(basepath)scss/font_open_sans_600.css" type="text/css"/>
+    <link rel="stylesheet" href="%(basepath)sassets/css/applify.min.css" type="text/css"/>
+    <link rel="stylesheet" href="%(basepath)scss/automat.css" type="text/css">
+
+</head>
+
+<body data-fade_in="on-load">
+
+<nav class="navbar navbar-fixed-top navbar-dark bg-indigo">
+    <div class="container">
+
+        <!-- Navbar Logo -->
+        <a class="ui-variable-logo navbar-brand" href="%(site_url)s/" title="BitDust">
+            <!-- Default Logo -->
+            <img class="logo-default" src="%(basepath)sassets/img/logo/bitdust-logo-white.svg" alt="BitDust">
+            <!-- Transparent Logo -->
+            <img class="logo-transparent" src="%(basepath)sassets/img/logo/bitdust-logo-white.svg" alt="BitDust">
+        </a><!-- .navbar-brand -->
+
+        <!-- Navbar Navigation -->
+        <div class="ui-navigation navbar-center">
+            <ul class="nav navbar-nav">
+                <!-- Nav Item -->
+                <li>
+                    <a href="%(basepath)sindex.html#product">Product</a>
+                </li>
+                <!-- Nav Item -->
+                <li>
+                    <a href="%(basepath)sindex.html#problem">Problem</a>
+                </li>
+                <!-- Nav Item -->
+                <li>
+                    <a href="%(basepath)sindex.html#solution">Solution</a>
+                </li>
+                <!-- Nav Item -->
+                <li>
+                    <a href="%(basepath)sindex.html#ecosystem">Ecosystem</a>
+                </li>
+                <!-- Nav Item -->
+                <li>
+                    <a href="%(basepath)sindex.html#roadmap">Roadmap</a>
+                </li>
+                <!-- Nav Item -->
+                <li>
+                    <a href="%(basepath)sindex.html#team">Team</a>
+                </li>
+                <!-- Nav Item -->
+                <li class="active">
+                    <a href="%(wikipath)s">Wiki</a>
+                </li>
+
+                <!-- Nav Item -->
+                <li class="dropdown active">
+                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">
+                        Network
+                    </a>
+                    <ul class="dropdown-menu">
+                        <li class="dropdown-item">
+                            <a href="%(idserverspath)s" style="color:#8089ff;">ID servers</a>
+                        </li>
+                        <li class="dropdown-item">
+                            <a href="%(blockchainpath)s" style="color:#8089ff;">Blockchain</a>
+                        </li>
+                    </ul>
+                </li>
+
+            </ul><!--.navbar-nav -->
+        </div><!--.ui-navigation -->
+
+        <!-- Navbar Button -->
+        <a href="%(basepath)sindex.html#product"
+           class="btn btn-sm ui-gradient-peach pull-right">
+            Get Started
+        </a>
+
+
+    </div><!-- .container -->
+</nav> <!-- nav -->
+
+
+<!-- Main -->
+<div class="%(div_main_class)s" role="main">
+
+%(div_main_body)s
+
+<!-- Footer -->
+<footer class="ui-footer bg-gray">
+    <div class="container pt-6 pb-6">
+        <div class="row">
+            <div class="col-sm-8 footer-about footer-col center-on-sm">
+                <img src="%(basepath)sassets/img/logo/bitdust-logo-white.svg" alt="BitDust" />
+                <p class="mt-1">
+                    We are currently with a small team primarily focusing on the development and supporting the BitDust community.
+                    Join us via Telegram or send a email.
+                </p>
+            </div>
+
+            <div class="col-md-4 col-sm-6 footer-col center-on-sm">
+                <div>
+                    <a class="btn ui-gradient-purple btn-circle shadow-md" href="https://t.me/bitdust" target="_blank">
+                        <span class="fa fa-telegram"></span>
+                    </a>
+                    <a class="btn ui-gradient-blue btn-circle shadow-md" href="https://github.com/bitdust-io/" target="_blank">
+                        <span class="fa fa-github"></span>
+                    </a>
+                </div>
+            </div>
+        </div><!-- .row -->
+    </div><!-- .container -->
+
+    <!-- Footer Copyright -->
+    <div class="footer-copyright bg-dark-gray">
+        <div class="container">
+            <div class="row">
+                <!-- Copyright -->
+                <div class="col-sm-6 center-on-sm">
+                    <p>
+                        &copy; 2019 <a href="%(site_url)s" target="_blank" title="BitDust">BitDust</a>
+                    </p>
+                </div>
+                <!-- Social Icons -->
+                <div class="col-sm-6 text-right">
+                    <ul class="footer-nav">
+                        <li>
+                            <a href="%(site_url)s%(wikipath)s">
+                                Wiki
+                            </a>
+                        </li>
+                        <li>
+                            <a href="https://github.com/bitdust-io/">
+                                Github
+                            </a>
+                        </li>
+                    </ul>
+                </div>
+            </div>
+        </div><!-- .container -->
+    </div><!-- .footer-copyright -->
+
+</footer><!-- .ui-footer -->
+
+</div>
+<!-- Main -->
+
+
+<!-- Scripts -->
+<script src="%(basepath)sassets/js/libs/jquery/jquery-3.2.1.min.js"></script>
+<script src="%(basepath)sassets/js/libs/slider-pro/jquery.sliderPro.min.js"></script>
+<script src="%(basepath)sassets/js/libs/owl.carousel/owl.carousel.min.js"></script>
+<script src="%(basepath)sassets/js/libs/form-validator/form-validator.min.js"></script>
+<script src="%(basepath)sassets/js/libs/bootstrap.js"></script>
+<script src="%(basepath)sassets/js/applify/ui-map.js"></script>
+<script src="%(basepath)sassets/js/applify/build/applify.js"></script>
+%(google_analytics)s
+<!-- Scripts -->
+
+</body>
+</html>"""
+
+div_main_class = 'main wiki'
+
+div_main_body = ''
+
+GOOGLE_ANALITICS = """
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=%(google_analytics_code)s"></script>
+<script>
+    window.dataLayer = window.dataLayer || [];
+
+    function gtag() {
+        dataLayer.push(arguments);
+    }
+
+    gtag('js', new Date());
+
+    gtag('config', '%(google_analytics_code)s');
+</script>
+"""
+
+google_analytics = GOOGLE_ANALITICS % dict(google_analytics_code='', )
diff --git a/bitdust/main/config_defaults.py b/bitdust/main/config_defaults.py
index 84254620e..3202f90cc 100644
--- a/bitdust/main/config_defaults.py
+++ b/bitdust/main/config_defaults.py
@@ -92,6 +92,10 @@ def reset(conf_obj):
     conf_obj.setDefaultValue('services/blockchain-authority/requests-reading-offset', 0)
     conf_obj.setDefaultValue('services/blockchain-authority/requests-reading-limit', 50)
 
+    conf_obj.setDefaultValue('services/blockchain-explorer/enabled', 'false')
+    conf_obj.setDefaultValue('services/blockchain-explorer/host', '127.0.0.1')
+    conf_obj.setDefaultValue('services/blockchain-explorer/web-port', 19080)
+
     conf_obj.setDefaultValue('services/bismuth-blockchain/enabled', 'false')
 
     conf_obj.setDefaultValue('services/bismuth-node/enabled', 'false')
diff --git a/bitdust/main/config_types.py b/bitdust/main/config_types.py
index 8f24ed4a1..82a5d04ba 100644
--- a/bitdust/main/config_types.py
+++ b/bitdust/main/config_types.py
@@ -110,6 +110,9 @@ def defaults():
         'services/blockchain-authority/registration-bonus-coins': TYPE_POSITIVE_INTEGER,
         'services/blockchain-authority/requests-reading-offset': TYPE_POSITIVE_INTEGER,
         'services/blockchain-authority/requests-reading-limit': TYPE_NON_ZERO_POSITIVE_INTEGER,
+        'services/blockchain-explorer/enabled': TYPE_BOOLEAN,
+        'services/blockchain-explorer/host': TYPE_STRING,
+        'services/blockchain-explorer/web-port': TYPE_PORT_NUMBER,
         'services/bismuth-blockchain/enabled': TYPE_BOOLEAN,
         'services/bismuth-node/enabled': TYPE_BOOLEAN,
         'services/bismuth-node/host': TYPE_STRING,
@@ -164,7 +167,6 @@ def defaults():
         'services/identity-propagate/max-servers': TYPE_NON_ZERO_POSITIVE_INTEGER,
         'services/identity-propagate/automatic-rotate-enabled': TYPE_BOOLEAN,
         'services/identity-propagate/health-check-interval-seconds': TYPE_POSITIVE_INTEGER,
-        'services/identity-server/enabled': TYPE_BOOLEAN,
         'services/ip-port-responder/enabled': TYPE_BOOLEAN,
         'services/keys-registry/enabled': TYPE_BOOLEAN,
         'services/keys-storage/enabled': TYPE_BOOLEAN,
diff --git a/bitdust/services/service_blockchain_explorer.py b/bitdust/services/service_blockchain_explorer.py
new file mode 100644
index 000000000..d4bad3a31
--- /dev/null
+++ b/bitdust/services/service_blockchain_explorer.py
@@ -0,0 +1,59 @@
+#!/usr/bin/python
+# service_blockchain_explorer.py
+#
+# Copyright (C) 2008 Veselin Penev, https://bitdust.io
+#
+# This file (service_blockchain_explorer.py) is part of BitDust Software.
+#
+# BitDust is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# BitDust Software is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with BitDust Software.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Please contact us if you have any questions at bitdust.io@gmail.com
+#
+#
+#
+#
+"""
+..
+
+module:: service_blockchain_explorer
+"""
+
+from __future__ import absolute_import
+from bitdust.services.local_service import LocalService
+
+
+def create_service():
+    return BlockchainExplorerService()
+
+
+class BlockchainExplorerService(LocalService):
+
+    service_name = 'service_blockchain_explorer'
+    config_path = 'services/blockchain-explorer/enabled'
+
+    def dependent_on(self):
+        return [
+            'service_bismuth_node',
+        ]
+
+    def installed(self):
+        return True
+
+    def start(self):
+        from bitdust.blockchain import blockchain_explorer
+        return blockchain_explorer.init()
+
+    def stop(self):
+        from bitdust.blockchain import blockchain_explorer
+        return blockchain_explorer.shutdown()
diff --git a/bitdust/userid/id_server.py b/bitdust/userid/id_server.py
index d1d69ddf4..10b493962 100644
--- a/bitdust/userid/id_server.py
+++ b/bitdust/userid/id_server.py
@@ -64,6 +64,7 @@
 if __name__ == '__main__':
     import os.path as _p
     sys.path.insert(0, _p.abspath(_p.join(_p.dirname(_p.abspath(sys.argv[0])), '..')))
+    sys.path.insert(0, _p.abspath(_p.join(_p.dirname(_p.abspath(sys.argv[0])), '..', '..')))
 
 #------------------------------------------------------------------------------
 
@@ -79,6 +80,8 @@
 from bitdust.lib import misc
 from bitdust.lib import net_misc
 
+from bitdust.interface import web_html_template
+
 from bitdust.main import settings
 
 from bitdust.userid import identity
@@ -111,10 +114,12 @@ def A(event=None, *args, **kwargs):
 
 
 class IdServer(automat.Automat):
+
     """
     This class implements all the functionality of the ``id_server()`` state
     machine.
     """
+
     def init(self):
         """
         Method to initialize additional variables and flags at creation of the
@@ -328,6 +333,7 @@ def _save_identity(self, inputfilename):
 
 
 class IdServerProtocol(basic.Int32StringReceiver):
+
     def __init__(self):
         self.fpath = None  # string with path/filename
         self.fin = None  # integer file descriptor like os.open() returns
@@ -398,6 +404,7 @@ def connectionLost(self, reason):
 
 
 class IdServerFactory(ServerFactory):
+
     def buildProtocol(self, addr):
         p = IdServerProtocol()
         p.factory = self
@@ -408,6 +415,7 @@ def buildProtocol(self, addr):
 
 
 class WebMainPage(resource.Resource):
+
     def render_POST(self, request):
         inp = BytesIO(request.content.read())
         fin, fpath = tmpfile.make('idsrv', extension='.xml')
@@ -461,7 +469,7 @@ def render_GET(self, request):
             url = '/' + filename
             name = filename[:-4]
             src += '<p><a href="%s"><nobr>%s</nobr></a></p>\n' % (strng.to_text(url), strng.to_text(name))
-        src += '</td>\n</tr>\n</table>\n</td>\n</tr>\n<tr><td align=left>'
+        src += '</td>\n</tr>\n</table>\n'
         src += '<br><br><p>Total identities on "%s": %d</p><br><br>\n' % (strng.to_text(A().hostname), len(files))
         src += '<p>Other known identity servers:\n'
         for idhost in sorted(known_servers.by_host().keys()):
@@ -480,6 +488,7 @@ def render_GET(self, request):
 
 
 class WebRoot(resource.Resource):
+
     def getChild(self, path, request):
         if not path:
             return self
@@ -502,27 +511,102 @@ def getChild(self, path, request):
 #------------------------------------------------------------------------------
 
 
+class KnownIDServersWebRoot(resource.Resource):
+
+    def getChild(self, path, request):
+        if not path:
+            return self
+        return resource.NoResource('Not found')
+
+
+class KnownIDServersWebMainPage(resource.Resource):
+
+    def render_GET(self, request):
+        src = ''
+        src += '<div id="ui-blockchain-explorer" class="section bg-light">\n'
+        src += '<div class="container">\n'
+        src += '<div class="ui-card">\n'
+        src += '<div class="card-body">\n'
+
+        src += '<div class="row justify-content-center">\n'
+        src += '<h1 align=center>BitDust identity servers</h1>\n'
+        src += '</div><br>\n'
+
+        src += '<div class="row">\n'
+        for idhost in sorted(known_servers.by_host().keys()):
+            idport = known_servers.by_host()[idhost][0]
+            if idport != 80:
+                idhost += ':%d' % idport
+            src += '<div class="col-4">\n'
+            src += '<div class="ui-card ui-action-card ui-accordion shadow-sm" data-target="http://%s/">\n' % strng.to_text(idhost)
+            src += '<div class="card-body">\n'
+            src += '<h5 align=center><a class="card-link" href="http://%s/">%s</a></h5>\n' % (strng.to_text(idhost), strng.to_text(idhost))
+            src += '</div>\n'
+            src += '</div>\n'
+            src += '</div>\n'
+        src += '</div>\n'
+
+        src += '</div>\n'
+        src += '</div>\n'
+        src += '</div>\n'
+        src += '</div>\n'
+
+        html_src = web_html_template.WEB_ROOT_TEMPLATE % dict(
+            title='BitDust identity servers',
+            site_url='https://bitdust.io',
+            basepath='https://bitdust.io/',
+            wikipath='https://bitdust.io/wiki/',
+            idserverspath='https://identities.bitdust.io/',
+            blockchainpath='https://blockchain.bitdust.io/',
+            div_main_class='main idservers',
+            div_main_body=src,
+            google_analytics='',
+        )
+        return strng.to_bin(html_src)
+
+
+def render_known_id_servers(web_port):
+    root = KnownIDServersWebRoot()
+    root.putChild(b'', KnownIDServersWebMainPage())
+    reactor.listenTCP(web_port, server.Site(root))  # @UndefinedVariable
+
+
+#------------------------------------------------------------------------------
+
+
 def main():
     bpio.init()
     settings.init()
+    lg.set_debug_level(_DebugLevel)
+
+    serve_known_id_servers = False
     if len(sys.argv) > 1:
-        web_port = int(sys.argv[1])
+        if sys.argv[1].strip() == 'known_id_servers':
+            serve_known_id_servers = True
+            web_port = settings.getIdServerWebPort()
+        else:
+            web_port = int(sys.argv[1])
     else:
         web_port = settings.getIdServerWebPort()
     if len(sys.argv) > 2:
         tcp_port = int(sys.argv[2])
     else:
         tcp_port = settings.getIdServerTCPPort()
-    lg.set_debug_level(20)
-    lg.out(2, 'starting ID server ...')
-    reactor.addSystemEventTrigger(  # @UndefinedVariable
-        'before',
-        'shutdown',
-        A().automat,
-        'shutdown',
-    )
-    reactor.callWhenRunning(A, 'init', (web_port, tcp_port))  # @UndefinedVariable
-    reactor.callLater(0, A, 'start')  # @UndefinedVariable
+
+    if serve_known_id_servers:
+        web_port = int(sys.argv[2])
+        lg.out(2, 'serving known ID servers web_port=%d' % web_port)
+        reactor.callWhenRunning(render_known_id_servers, web_port)  # @UndefinedVariable
+
+    else:
+        lg.out(2, 'starting ID server web_port=%d tcp_port=%d' % (
+            web_port,
+            tcp_port,
+        ))
+        reactor.addSystemEventTrigger('before', 'shutdown', A().automat, 'shutdown')  # @UndefinedVariable
+        reactor.callWhenRunning(A, 'init', (web_port, tcp_port))  # @UndefinedVariable
+        reactor.callLater(0, A, 'start')  # @UndefinedVariable
+
     reactor.run()  # @UndefinedVariable
     settings.shutdown()
     lg.out(2, 'reactor stopped, EXIT')
diff --git a/bitdust_forks/Bismuth/apihandler.py b/bitdust_forks/Bismuth/apihandler.py
index decfdbca0..39feaee9a 100644
--- a/bitdust_forks/Bismuth/apihandler.py
+++ b/bitdust_forks/Bismuth/apihandler.py
@@ -703,7 +703,7 @@ def api_gettransaction(self, socket_handler, db_handler, peers):
             if self.config.old_sqlite:
                 db_handler.execute_param(db_handler.h, 'SELECT * FROM transactions WHERE signature like ?1', (transaction_id + '%', ))
             else:
-                db_handler.execute_param(db_handler.h, 'SELECT * FROM transactions WHERE substr(signature,1,4)=substr(?1,1,4) and  signature like ?1', (transaction_id + '%', ))
+                db_handler.execute_param(db_handler.h, 'SELECT * FROM transactions WHERE substr(signature,1,4)=substr(?1,1,4) and signature like ?1', (transaction_id + '%', ))
             raw = db_handler.h.fetchone()
             if not format:
                 connections.send(socket_handler, raw)
diff --git a/bitdust_forks/Bismuth/dbhandler.py b/bitdust_forks/Bismuth/dbhandler.py
index c04da050a..8c7ca3c57 100644
--- a/bitdust_forks/Bismuth/dbhandler.py
+++ b/bitdust_forks/Bismuth/dbhandler.py
@@ -166,7 +166,7 @@ def txsearch(self, address=None, recipient=None, operation=None, openfield=None,
         sql += ' AND '.join(queries)
         sql += ' LIMIT ?, ?;'
         try:
-            print('DB:txsearch', sql, params)
+            # print('DB:txsearch', sql, params)
             self.execute_param(self.h, sql, tuple(params))
             result = self.h.fetchall()
         except:
diff --git a/bitdust_forks/Bismuth/worker.py b/bitdust_forks/Bismuth/worker.py
index 9fac411e8..33932c1db 100644
--- a/bitdust_forks/Bismuth/worker.py
+++ b/bitdust_forks/Bismuth/worker.py
@@ -27,11 +27,11 @@ def sendsync(sdef, peer_ip, status, node):
     """
     # TODO: ERROR, does **not** save anything. code or comment wrong.
     node.logger.app_log.debug(f'Outbound: Synchronization with {peer_ip} finished after: {status}, sending new sync request')
-    time.sleep(Decimal(node.pause))
+    time.sleep(int(node.pause))
     while node.db_lock.locked():
         if node.IS_STOPPING:
             return
-        time.sleep(Decimal(node.pause))
+        time.sleep(int(node.pause))
     send(sdef, 'sendsync')
 
 
@@ -332,6 +332,8 @@ def worker(host, port, node):
             fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
             print(exc_type, fname, exc_tb.tb_lineno)
             """
+            import traceback
+            traceback.print_exc()
 
             # remove from active pool
             node.peers.remove_client(this_client)
diff --git a/tests/test_id_url.py b/tests/test_id_url.py
index 951853a0d..fc39a64e9 100644
--- a/tests/test_id_url.py
+++ b/tests/test_id_url.py
@@ -280,9 +280,9 @@ def test_identity_cached(self):
         self._cache_identity('bob')
         self.assertTrue(id_url.field(alice_text) != id_url.field(bob))
         self.assertEqual(str(id_url.field(alice_text)), 'http://127.0.0.1:8084/alice.xml')
-        self.assertEqual(repr(id_url.field(alice_text)), '[http://127.0.0.1:8084/alice.xml]')
+        self.assertEqual(repr(id_url.field(alice_text)), '{http://127.0.0.1:8084/alice.xml}')
         self.assertEqual('=%s=' % id_url.field(alice_text), '=http://127.0.0.1:8084/alice.xml=')
-        self.assertEqual('=%r=' % id_url.field(alice_text), '=[http://127.0.0.1:8084/alice.xml]=')
+        self.assertEqual('=%r=' % id_url.field(alice_text), '={http://127.0.0.1:8084/alice.xml}=')
 
     def test_identity_not_cached(self):
         self._cache_identity('alice')
@@ -601,15 +601,15 @@ def test_fake_name(self):
 
     def test_latest_vs_original(self):
         idurl_hans_not_cached = id_url.field(hans1)
-        self.assertEqual('=%r=' % idurl_hans_not_cached, '=[http://first.com/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans_not_cached, '={http://first.com/hans.xml}=')
         self._cache_identity('hans1')
         idurl_hans_cached = id_url.field(hans1)
-        self.assertEqual('=%r=' % idurl_hans_cached, '=[http://first.com/hans.xml]=')
-        self.assertEqual('=%r=' % id_url.field(hans1), '=[http://first.com/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans_cached, '={http://first.com/hans.xml}=')
+        self.assertEqual('=%r=' % id_url.field(hans1), '={http://first.com/hans.xml}=')
         self._cache_identity('hans2')
-        self.assertEqual('=%r=' % id_url.field(hans1), '=[*http://second.net/hans.xml]=')
+        self.assertEqual('=%r=' % id_url.field(hans1), '={*http://second.net/hans.xml}=')
         self._cache_identity('hans3')
-        self.assertEqual('=%r=' % id_url.field(hans1), '=[*http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % id_url.field(hans1), '={*http://third.org/hans.xml}=')
         self.assertEqual(id_url.field(hans1), id_url.field(hans2))
         self.assertNotEqual(id_url.field(hans1).original(), id_url.field(hans2).original())
         self.assertEqual(id_url.field(hans1), id_url.field(hans3))
@@ -620,21 +620,21 @@ def test_latest_vs_original(self):
         self.assertEqual(id_url.field(hans2).to_text(), hans3)
         self.assertEqual(id_url.field(hans3).to_text(), hans3)
         idurl_hans1 = id_url.field(hans1)
-        self.assertEqual('=%r=' % idurl_hans1, '=[*http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans1, '={*http://third.org/hans.xml}=')
         self.assertFalse(idurl_hans1.refresh())
-        self.assertEqual('=%r=' % idurl_hans1, '=[*http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans1, '={*http://third.org/hans.xml}=')
         idurl_hans2 = id_url.field(hans2)
-        self.assertEqual('=%r=' % idurl_hans2, '=[*http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans2, '={*http://third.org/hans.xml}=')
         self.assertFalse(idurl_hans2.refresh())
-        self.assertEqual('=%r=' % idurl_hans2, '=[*http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans2, '={*http://third.org/hans.xml}=')
         idurl_hans3 = id_url.field(hans3)
-        self.assertEqual('=%r=' % idurl_hans3, '=[http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans3, '={http://third.org/hans.xml}=')
         self.assertFalse(idurl_hans3.refresh())
-        self.assertEqual('=%r=' % idurl_hans3, '=[http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans3, '={http://third.org/hans.xml}=')
         self.assertTrue(idurl_hans_not_cached.refresh())
-        self.assertEqual('=%r=' % idurl_hans_not_cached, '=[http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans_not_cached, '={http://third.org/hans.xml}=')
         self.assertTrue(idurl_hans_cached.refresh())
-        self.assertEqual('=%r=' % idurl_hans_cached, '=[http://third.org/hans.xml]=')
+        self.assertEqual('=%r=' % idurl_hans_cached, '={http://third.org/hans.xml}=')
 
     def test_latest_revision_order_123(self):
         self._cache_identity('hans1')