After confirmation of DOI - in case send-dApp is offline - confirmation might not be informed

After a DOI confirmation Alice gets informed by REST about the confirmation of Peter on Bob's node via REST. In case Alice is down for mainenance the confirmation must be repeated by Bob by a job and or Alice should be able to re-scan the blockchain about confirmed DOI's and update the local database about this.

Remark: This might be already implemented in some way but the status of a rescan of blockchain in case of an offline dApp is currently unclear and must be clarified first.

Please see https://bounties.doichain.org/ how to apply for Doichain bounties.