Science and education scientific publishing center virtualconferences. Press international conference science and

Yuldashov Azizbek Abatovich 
Master of Karakalpak State University
[e-mail]
Summary. In this article, the basic concepts of blockchain technology, the main idea of
blockchain technology, the mathematical basis of blockchain technology, the application of hash 
function algorithms and the main ideas of the application of blockchain technology in the bank 
lending system.
Keywords. Blockchain, hash function, transaction, block, symmetric, decryption, hashing.
Nowadays, every day we hear news that is an important factor in the economy of our country, is 
rich in innovations, in particular, due to the rapid development of the global banking and financial 
system, the banking sector, which is one of the most important sectors of the economy, is increasingly 
in need of new modern information and communication technologies [1].
Indeed, the speed, quality and transparency of all services provided by commercial banks using 
information and communication technologies is a requirement of today. It is no secret that the various 
forms of modern remote banking services, which are now replacing traditional banking services, provide 
exactly the same quality and reliability. Modern banking services serve to increase the opportunities 
of customers by creating greater convenience and transparency. Information technologies based on 
modern service solutions for the banking system, widespread introduction of financial technologies, 
ensure adequate information security, as well, measures are being taken to reduce the impact of the 
human factor in the provision of financial bank lending services [1]. In this regard, the action strategy 
sets out certain measures, and consistent research is currently underway to digitize the system and 
ensure information security.
One such study is the liberalization of the lending system in the banking sector and the non-
use of third parties, ie brokers, in bank lending operations. In today’s digital world, we use brokers 
first when performing any remote transactions. For example, money transfers from one account to 
another, all electronic payments, utility bills, etc. We use brokerage systems such as Payme, Paynet, 
PayPal, Click, etc., when conducting banking operations. Or in the process of conducting other types 
of banking operations, brokers withhold their fixed commissions. This is definitely part of a whole 
piece of information.
A blockchain is a growing list of records, called blocks, that are linked using cryptography[2]. Each 
block contains a cryptographic hash of the previous block a timestamp, and transaction data (generally 
represented as a Merkle tree)[3].
By design, a blockchain is resistant to modification of its data. This is because once recorded, the 
data in any given block cannot be altered retroactively without alteration of all subsequent blocks. For 
use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively 
adhering to a protocol for inter-node communication and validating new blocks. Although blockchain 
records are not unalterable, blockchains may be considered secure by design and exemplify a 

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