Any explanation about the transactions of today?

It looks like some people bought and sold some shares -- not sure which transactions you mean. We're actively trading a number of assets like Coinomat and USDbitfinx, and some others. Which do you mean?

# Timestamp IO Account Amount Type Fee Transaction

102. 01.02.2015 08:53:11 NXT-VGWL-74SL-8EDC-6J3W3 1.00 Payment 1 15359389627286636551

103. 01.02.2015 08:52:57 NXT-9HP3-8QJW-NY3Y-9QLLZ 1.00 Payment 1 17387484240241591969

104. 01.02.2015 08:52:41 NXT-TU9M-RZM6-5WUY-9LANW 1.00 Payment 1 8346372986124569357

105. 01.02.2015 08:52:25 NXT-EUH2-Y9LT-J54V-EPB56 1.00 Payment 1 3295423779352379358

106. 01.02.2015 08:52:03 NXT-DCUZ-GC45-SBKW-5FNY7 1.00 Payment 1 6631199196181748730

107. 01.02.2015 08:52:12 NXT-MAX4-6ZDE-3QVX-CDMY9 1.00 Payment 1 15870849069368446603

108. 01.02.2015 08:51:48 NXT-D47S-W3YE-VT3G-5KV96 1.00 Payment 1 11924633906776327894

109. 01.02.2015 08:51:33 NXT-F87Z-VNC2-A28A-2ZHYW 1.00 Payment 1 17713892772407651075

110. 01.02.2015 08:51:24 NXT-A3CC-YG8Z-HNFP-23QMS 1.00 Payment 1 1037071872717918125

111. 01.02.2015 08:51:14 NXT-P44H-3ZA6-TQBD-FESF3 1.00 Payment 1 6006480713821828763

112. 01.02.2015 08:50:43 NXT-LJDM-AHWF-Q59M-FZTBK 1.00 Payment 1 4997670831906018558

113. 01.02.2015 08:50:29 NXT-S75C-K4F3-8QDM-9T6V8 1.00 Payment 1 11737192234863663142

114. 01.02.2015 08:49:59 NXT-E3YA-EQ84-9PHC-7E7UC 1.00 Payment 1 8435290281770240436

115. 01.02.2015 08:49:46 NXT-8CBP-XQAH-J47K-GNQPB 1.00 Payment 1 17897181045195287416

116. 01.02.2015 08:49:31 NXT-WTS8-HP56-9HRA-H6HVD 1.00 Payment 1 5524142711981193236

117. 01.02.2015 08:49:19 NXT-V35S-6QQE-B6XH-6LPUR 1.00 Payment 1 17042126642580438817

118. 01.02.2015 08:48:54 NXT-8T88-RJHB-QE2X-H4TXW 1.00 Payment 1 5683418525448889324

119. 01.02.2015 08:48:44 NXT-JGKG-5VF4-CCZS-HTSY3 1.00 Payment 1 5985797166189507722

120. 01.02.2015 08:48:33 NXT-D62V-SLDU-S9S8-H495J 1.00 Payment 1 1985012910973249544

121. 01.02.2015 08:48:23 NXT-XLR8-66PW-253Z-3T5M8 1.00 Payment 1 13299240019821878762

122. 01.02.2015 08:47:49 NXT-JGNJ-5RZ7-C6KY-AC2XL 1.00 Payment 1 15998430551633332411

123. 01.02.2015 08:47:34 NXT-NH53-QEG6-NG4U-6D9DZ 1.00 Payment 1 4039184656290162059

124. 01.02.2015 08:47:21 NXT-7PJE-3NSH-C7W5-GU4FT 1.00 Payment 1 1476453121302648001

125. 01.02.2015 08:46:36 NXT-3KVZ-NF4B-36V2-7B9YA 1.00 Payment 1 5860506737758623608

126. 01.02.2015 08:46:08 NXT-CSMZ-VJV5-YVVP-5FZQU 1.00 Payment 1 5797807424217960965

127. 01.02.2015 08:46:24 NXT-8D65-AVB7-X8SM-2JTX4 1.00 Payment 1 9916547066699099920

128. 01.02.2015 08:45:55 NXT-4ATT-SD4C-VGD4-BYRBY 1.00 Payment 1 10205692356566291922

129. 01.02.2015 08:43:34 NXT-4HFF-7TTU-YTVL-AVMWV 1.00 Payment 1 3644681214783323105