Blockchain is typically managed by peer to peer network collectively and need protocols for inter node communication for validating blocks and is generally invented by a person named satoshi nakamato in 2008. Block chains over write old blocks by new block and while doing so there may be an error associated with it and while accessing the file next time you may face password issue recovery issue and many more.
If a user is not able to re write old blocks and face issue as explained in various blogs the resolution to the various problems then they are free to contact Blockchain customer support. The certified team of professionals are working here to understand your issue and to resolve it by providing help online. To get in touch with certified experts of Blockchain number users are free to call toll free 1844-517-3111 number to get instant assistance.