Chamelyon for LinkedIn will allow you to certify your posts through the use of its blockchain.

Chamelyon is the first mutable blockchain where the users have full control of the chain inside every single block. It allows you to modify the data in the block, maintaining the history of changes immutable and verifiable by everyone. 

With this technology, the verification process doesn’t require any complicated steps such as key exchange or digital signature: a Chamelyon user simply needs the public key of another Chamelyon user to verify the block contents, ownership, and track history of the changes.