Sailsquare allows each user to verify his/her own profile through authentication of the e-mail address, mobile phone number and Facebook profile. You can see what another user has checked by looking at the verification badges that you can find in his public profile.
Having a detailed profile, with a picture and a rich description are using all the methods provided by Sailsquare to verify your identity are all elements that allow you to increase the confidence of other users towards you. When you take part in an experience you can receive reviews that will allow you to get even more trust from other users and Crew Leaders/Tour Leaders.
Anyhow, whether you are a traveler or a skipper, you should ask to your interlocutors to fill in all the information field and have the more accurate profile possible.