diff --git a/DopeCoin-qt.pro b/DopeCoin-qt.pro
index ff32a0b59e..62ed00bbee 100644
--- a/DopeCoin-qt.pro
+++ b/DopeCoin-qt.pro
@@ -1,6 +1,6 @@
 TEMPLATE = app
 TARGET = dopecoin-qt
-VERSION = 4.0.0.5
+VERSION = 4.0.0.6
 INCLUDEPATH += src src/json src/qt
 QT += network
 DEFINES += ENABLE_WALLET
diff --git a/README.md b/README.md
index 54d587537b..48dfeddd1c 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,12 @@ Specifications:
 Builds:
 ----------------
 
+v.4.0.0.6:
+
+- Disconnect nodes older than protocol version 40001
+- Updated seed nodes
+- Added checkpoint at block 427520
+
 v.4.0.0.5:
 
 - Code updated to Blackcoin 1.2.5
diff --git a/share/seeds/nodes_main.txt b/share/seeds/nodes_main.txt
index b0dad419de..0f9036c2bb 100644
--- a/share/seeds/nodes_main.txt
+++ b/share/seeds/nodes_main.txt
@@ -1,114 +1,55 @@
-1.129.106.123
+1.163.168.77
+100.0.34.238
+101.177.84.68
+101.177.99.117
+101.179.97.74
+103.213.192.78
+103.224.129.221
 104.129.31.27
-104.173.0.147
-108.228.205.154
-109.152.167.41
-109.252.108.126
-109.40.0.11
-109.40.1.108
-109.40.3.21
-110.54.231.214
-112.198.76.24
-118.92.22.118
-124.171.129.147
-129.21.192.214
-138.197.187.54
-142.105.4.183
-155.4.59.125
-162.204.48.211
-166.181.86.177
-171.248.229.210
-172.112.104.149
-172.194.80.16
-172.72.39.154
-173.22.89.233
+108.170.1.134
+108.208.121.111
+110.151.34.183
+122.116.119.109
+144.121.14.226
+151.229.173.149
+158.69.246.121
+159.65.178.211
+171.232.96.9
 173.230.186.109
-173.24.106.189
-173.30.64.211
-173.93.134.62
-174.227.1.210
-174.227.144.75
-174.3.236.5
-176.11.114.30
-178.232.207.143
-184.160.22.83
-184.22.27.83
-184.5.2.31
-188.221.125.241
-188.252.151.22
-188.68.52.172
-193.242.150.221
-202.3.242.65
-208.38.41.186
-209.94.180.12
-213.46.19.18
-217.92.241.18
-219.74.2.139
-23.16.182.137
-24.176.168.15
-24.220.214.42
-24.70.11.55
-24.92.111.83
-27.75.19.255
-27.78.67.36
-31.10.150.207
-31.24.14.94
+173.239.228.8
+176.9.156.236
+178.24.72.62
+188.166.89.189
+192.40.95.29
+203.173.11.216
+212.92.114.238
+213.32.17.161
+24.140.253.179
+24.176.46.74
 37.0.51.237
-37.120.186.85
-37.120.190.76
-37.47.34.230
-38.141.47.49
-38.95.111.67
+37.187.152.7
+37.25.73.90
 47.18.36.141
-47.182.180.104
 47.208.205.119
-47.222.40.62
-49.170.162.144
-58.6.182.68
-66.168.61.43
-66.227.164.145
-67.188.66.181
+67.166.216.244
 68.108.170.133
-68.206.26.134
+68.71.168.125
 68.84.154.196
-69.143.67.98
-69.172.173.185
-70.104.137.89
-70.127.45.65
-70.71.157.109
 71.198.117.49
-71.55.228.20
-73.10.101.10
-73.106.12.226
-73.203.94.6
-73.65.101.223
-75.130.162.248
-77.119.131.141
-78.149.251.113
-80.101.212.164
-80.147.221.30
-80.153.118.39
-80.218.194.81
-81.104.95.71
-81.11.232.51
-82.26.222.160
-82.41.14.232
-83.30.250.153
-83.7.243.209
-84.177.236.206
-85.164.9.213
-86.50.86.12
-87.245.126.33
+71.55.226.146
+72.213.224.147
+73.119.99.7
+73.207.15.100
+74.57.148.200
+75.138.193.231
+81.20.204.12
+83.227.63.229
+86.134.69.137
+87.148.209.173
+87.148.210.178
 88.161.94.127
-90.177.252.224
-91.141.0.101
-92.233.46.0
-93.125.107.34
-93.219.218.194
-93.219.231.43
-95.47.214.88
-96.44.144.106
-96.73.198.196
-98.122.170.176
-98.211.29.199
-98.235.32.229
+91.113.78.203
+92.14.228.26
+93.82.78.36
+98.146.180.164
+98.195.155.113
diff --git a/src/chainparamsseeds.h b/src/chainparamsseeds.h
index cc569039ad..d9ba237e52 100644
--- a/src/chainparamsseeds.h
+++ b/src/chainparamsseeds.h
@@ -6,120 +6,61 @@
 // Each line contains a 16-byte IPv6 address and a port.
 // IPv4 as well as onion addresses are wrapped inside a IPv6 address accordingly.
 static SeedSpec6 pnSeed6_main[] = {
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x01,0x81,0x6a,0x7b}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x01,0xa3,0xa8,0x4d}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x64,0x00,0x22,0xee}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x65,0xb1,0x54,0x44}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x65,0xb1,0x63,0x75}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x65,0xb3,0x61,0x4a}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x67,0xd5,0xc0,0x4e}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x67,0xe0,0x81,0xdd}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x68,0x81,0x1f,0x1b}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x68,0xad,0x00,0x93}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6c,0xe4,0xcd,0x9a}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6d,0x98,0xa7,0x29}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6d,0xfc,0x6c,0x7e}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6d,0x28,0x00,0x0b}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6d,0x28,0x01,0x6c}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6d,0x28,0x03,0x15}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6e,0x36,0xe7,0xd6}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x70,0xc6,0x4c,0x18}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x76,0x5c,0x16,0x76}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x7c,0xab,0x81,0x93}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x81,0x15,0xc0,0xd6}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x8a,0xc5,0xbb,0x36}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x8e,0x69,0x04,0xb7}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x9b,0x04,0x3b,0x7d}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xa2,0xcc,0x30,0xd3}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xa6,0xb5,0x56,0xb1}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xab,0xf8,0xe5,0xd2}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xac,0x70,0x68,0x95}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xac,0xc2,0x50,0x10}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xac,0x48,0x27,0x9a}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xad,0x16,0x59,0xe9}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6c,0xaa,0x01,0x86}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6c,0xd0,0x79,0x6f}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x6e,0x97,0x22,0xb7}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x7a,0x74,0x77,0x6d}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x90,0x79,0x0e,0xe2}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x97,0xe5,0xad,0x95}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x9e,0x45,0xf6,0x79}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x9f,0x41,0xb2,0xd3}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xab,0xe8,0x60,0x09}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xad,0xe6,0xba,0x6d}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xad,0x18,0x6a,0xbd}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xad,0x1e,0x40,0xd3}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xad,0x5d,0x86,0x3e}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xae,0xe3,0x01,0xd2}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xae,0xe3,0x90,0x4b}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xae,0x03,0xec,0x05}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb0,0x0b,0x72,0x1e}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb2,0xe8,0xcf,0x8f}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb8,0xa0,0x16,0x53}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb8,0x16,0x1b,0x53}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb8,0x05,0x02,0x1f}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xbc,0xdd,0x7d,0xf1}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xbc,0xfc,0x97,0x16}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xbc,0x44,0x34,0xac}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xc1,0xf2,0x96,0xdd}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xca,0x03,0xf2,0x41}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xd0,0x26,0x29,0xba}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xd1,0x5e,0xb4,0x0c}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xd5,0x2e,0x13,0x12}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xd9,0x5c,0xf1,0x12}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xdb,0x4a,0x02,0x8b}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x17,0x10,0xb6,0x89}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x18,0xb0,0xa8,0x0f}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x18,0xdc,0xd6,0x2a}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x18,0x46,0x0b,0x37}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x18,0x5c,0x6f,0x53}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x1b,0x4b,0x13,0xff}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x1b,0x4e,0x43,0x24}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x1f,0x0a,0x96,0xcf}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x1f,0x18,0x0e,0x5e}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xad,0xef,0xe4,0x08}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb0,0x09,0x9c,0xec}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xb2,0x18,0x48,0x3e}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xbc,0xa6,0x59,0xbd}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xc0,0x28,0x5f,0x1d}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xcb,0xad,0x0b,0xd8}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xd4,0x5c,0x72,0xee}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xd5,0x20,0x11,0xa1}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x18,0x8c,0xfd,0xb3}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x18,0xb0,0x2e,0x4a}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x25,0x00,0x33,0xed}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x25,0x78,0xba,0x55}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x25,0x78,0xbe,0x4c}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x25,0x2f,0x22,0xe6}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x26,0x8d,0x2f,0x31}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x26,0x5f,0x6f,0x43}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x25,0xbb,0x98,0x07}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x25,0x19,0x49,0x5a}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x2f,0x12,0x24,0x8d}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x2f,0xb6,0xb4,0x68}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x2f,0xd0,0xcd,0x77}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x2f,0xde,0x28,0x3e}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x31,0xaa,0xa2,0x90}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x3a,0x06,0xb6,0x44}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x42,0xa8,0x3d,0x2b}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x42,0xe3,0xa4,0x91}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x43,0xbc,0x42,0xb5}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x43,0xa6,0xd8,0xf4}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x44,0x6c,0xaa,0x85}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x44,0xce,0x1a,0x86}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x44,0x47,0xa8,0x7d}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x44,0x54,0x9a,0xc4}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x45,0x8f,0x43,0x62}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x45,0xac,0xad,0xb9}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x46,0x68,0x89,0x59}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x46,0x7f,0x2d,0x41}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x46,0x47,0x9d,0x6d}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x47,0xc6,0x75,0x31}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x47,0x37,0xe4,0x14}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x49,0x0a,0x65,0x0a}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x49,0x6a,0x0c,0xe2}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x49,0xcb,0x5e,0x06}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x49,0x41,0x65,0xdf}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x4b,0x82,0xa2,0xf8}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x4d,0x77,0x83,0x8d}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x4e,0x95,0xfb,0x71}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x50,0x65,0xd4,0xa4}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x50,0x93,0xdd,0x1e}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x50,0x99,0x76,0x27}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x50,0xda,0xc2,0x51}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x51,0x68,0x5f,0x47}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x51,0x0b,0xe8,0x33}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x52,0x1a,0xde,0xa0}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x52,0x29,0x0e,0xe8}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x53,0x1e,0xfa,0x99}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x53,0x07,0xf3,0xd1}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x54,0xb1,0xec,0xce}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x55,0xa4,0x09,0xd5}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x56,0x32,0x56,0x0c}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x57,0xf5,0x7e,0x21}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x47,0x37,0xe2,0x92}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x48,0xd5,0xe0,0x93}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x49,0x77,0x63,0x07}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x49,0xcf,0x0f,0x64}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x4a,0x39,0x94,0xc8}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x4b,0x8a,0xc1,0xe7}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x51,0x14,0xcc,0x0c}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x53,0xe3,0x3f,0xe5}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x56,0x86,0x45,0x89}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x57,0x94,0xd1,0xad}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x57,0x94,0xd2,0xb2}, 40420},
     {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x58,0xa1,0x5e,0x7f}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5a,0xb1,0xfc,0xe0}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5b,0x8d,0x00,0x65}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5c,0xe9,0x2e,0x00}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5d,0x7d,0x6b,0x22}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5d,0xdb,0xda,0xc2}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5d,0xdb,0xe7,0x2b}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5f,0x2f,0xd6,0x58}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x60,0x2c,0x90,0x6a}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x60,0x49,0xc6,0xc4}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x62,0x7a,0xaa,0xb0}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x62,0xd3,0x1d,0xc7}, 40420},
-    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x62,0xeb,0x20,0xe5}, 40420}
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5b,0x71,0x4e,0xcb}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5c,0x0e,0xe4,0x1a}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5d,0x52,0x4e,0x24}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x62,0x92,0xb4,0xa4}, 40420},
+    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x62,0xc3,0x9b,0x71}, 40420}
 };
 
 static SeedSpec6 pnSeed6_test[] = {
diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index 6be61bc1df..9be319fc07 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -33,6 +33,7 @@ namespace Checkpoints
         ( 110000, uint256("0x92f5e226fb7bcc58f9933fa1c4836b5e2bf029bdb8e9eae366d80b14017841bc") )
         ( 300500, uint256("0x09d9bd6b9002bf66527e098f0e620a6f59c6a3b244bc0bc8f4c4879e19b8fbfa") )
         ( 345000, uint256("0x251f44f94e369ebebc51304ce1a7b367ecad8025e822a5a28407085915542a47") )
+        ( 427520, uint256("0xbcb1998feb84a6741beba7b11eb28fc496f3eacc51e110b3f7b03749b5c5b37e") )
     ;
     
     // TestNet has no checkpoints
diff --git a/src/clientversion.h b/src/clientversion.h
index 4c7b9e4b6c..9b37307c88 100644
--- a/src/clientversion.h
+++ b/src/clientversion.h
@@ -9,7 +9,7 @@
 #define CLIENT_VERSION_MAJOR       4
 #define CLIENT_VERSION_MINOR       0
 #define CLIENT_VERSION_REVISION    0
-#define CLIENT_VERSION_BUILD       5
+#define CLIENT_VERSION_BUILD       6
 
 // Set to true for release, false for prerelease or test build
 #define CLIENT_VERSION_IS_RELEASE  true
diff --git a/src/qt/res/images/splash.png b/src/qt/res/images/splash.png
index 6535797762..fdf5587f6a 100644
Binary files a/src/qt/res/images/splash.png and b/src/qt/res/images/splash.png differ
diff --git a/src/version.h b/src/version.h
index 35d800fbbb..ce9306aff8 100644
--- a/src/version.h
+++ b/src/version.h
@@ -36,7 +36,7 @@ static const int PROTOCOL_VERSION = 40001;
 static const int INIT_PROTO_VERSION = 209;
 
 // disconnect from peers older than this proto version
-static const int MIN_PEER_PROTO_VERSION = 40000;
+static const int MIN_PEER_PROTO_VERSION = 40001;
 
 // nTime field added to CAddress, starting with this version;
 // if possible, avoid requesting addresses nodes older than this