Block chain is a computerized data set containing data (like records of monetary exchanges) that can be at the same time utilized and shared inside an enormous decentralized, openly open organization. Block chain development has been a prominent occurrence of changing the statutes of wellbeing in money related trades and information exchange. It offers an extraordinary development for data integration with security. Block chain relies upon the norms of understanding, decentralization, and cryptography for following the trust in trades. In any case, block chain security issues have continued to agitate various affiliations and early adopters. It is sure that, even the grounded block chain new organizations experience burdens in block chain security. Without a doubt, block chain innovation has seen a far-reaching adaption lately. Aside from beginning adaption into digital currencies, today it is being utilized in medical care, land, shrewd contacts, and so forth.  The ill-advised execution of innovation has been the reason for some block chain block protection concern, which can put the block chain vulnerable and can permit the aggressors to play out a few noxious exercises. To address the secrecy to the sensitive information in the Block chain organization, a proposed method namely progressive secure key administration for Block-Chain Technology with Lagrange Interpolation (PKABCLI) has been presented in this paper.