I have read this thread and the whitepaper, I found that the ICO tokens will be 100% issued, does that means there is no any holding period for the dev team? I also can not see related information in the whitepaper.
Hi, yes we will issue 100% of tokens, and the team will have a vesting period for its tokens, don't worry about it

You can also check chapter 3.2.2 in our Whitepaper
Chapter 3.3.2:
3.2.2 CND token distribution
Tokens will be distributed as follows:
∼ 75% for token sale contributors;
20% for the Cindicator company (+ vesting);
∼ 3% for advisors and partners;
1% for the bounty campaign;
0.2% for current Cindicator forecasters (proportionally to their total rating).
I still can not see any information about the holding or locking period.