he was buying shares to move to CryptoStock at one point remember? Those Bitcoins could have been apart of that process and easily belong to the company.
Yes that is a third reason.
DTS you are getting all stressed out again, just when news is good/great. You do not need to worry about this. Worst-case-scenario is a court case and Ken has to repay the money back to Ukyo. I think that would NEVER happen.
http://legal-dictionary.thefreedictionary.com/lien
Other Liens
The published statutes of a state usually have a section on the topic of liens under which is listed most or all of the liens allowed by state law. A great number of persons in trade or business obtain liens for their services to personal property: garage keepers and warehouse owners for unpaid rent for storage; automobile mechanics for repairs; jewelers; dry cleaners and furriers; artisans for restoration of art objects; bankers; factors dealing in commodities; and many others. Not to be outdone, attorneys have a lien for their fees and may retain clients' files—perhaps containing vital information or documents needed by the client for work or family affairs—until the fees are paid
Lien is a widely used and recognised concept. Ken is doing the right thing.