benchoufi/DocChain: DocChain release

DocChain is a blockchain informed consent collection tool in the context of clinical trials.

The release consists in 2 parts

• the frontend web-service, dedicated to patients and investigators. Patients can give or decline consent regarding versioned protocols. Investigators can get the informations about the patients consent process acceptance or declining status.

• a blockchain agent sends the transactions related to patients interactions with the consent form to validation on the bitcoin network. Each instance of these interactions are bound to versions of protocol, which are also tracked on the blockchain