About this souvenir shop - Vilnius is my hometown and i am passing this small shop every day, the building with address Pilies str. 16 is very huge, it has large inner yard with many buildings in it, other thing it is common in Lithuania that one address is for mail and actual office is located in other location.

Also every few months we can see some articles in the largest Lithuanian bussiness newspaper about Bankera and Spectrocoin also with interviews from Vytautas Karalevicius (one of the founders of Spectrocoin and Bankera).

The last thing - you can find a lot of job proposals from Bankera and Spectrocoin in such sites as www.cv.lt, the other thing you can always check how much taxes they are paying for the salaries in the site:
Spectrocoin
https://rekvizitai.vz.lt/en/company/spectro_finance/ for June they paid Social insurance taxes 21,546.98 €
Bankera:
https://rekvizitai.vz.lt/en/company/bankera/ for June they paid Social insurance taxes   7,780.71 €

Everyone can check it.

Also you can translate this article, it is about fine for Bankera from LCB
https://www.vz.lt/rinkos/2019/06/12/teismas-panaikino-baudas-bankeros-ikurejui-ir-susijusiai-imonei