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This research examines the application of the Elliptic Curve Digital Signature Algorithm (ECDSA) in a blockchain system as a security solution for digital payment systems in Indonesia. Using a descriptive-qualitative approach based on literature review and conceptual simulations using Python, this study discusses the working principles of ECDSA, its advantages over other digital signature algorithms, and the challenges of its adoption in Indonesia. The results show that ECDSA provides high cryptographic efficiency, maintains transaction authenticity and integrity, and supports a transparent decentralized system. The academic simulations include not only KYC processes, top-ups, transactions, validation by validators, and block recording, but also demonstrates the formation of an interconnected multi-level blockchain and tests scenarios for rejecting manipulated or invalid transactions. The contribution of this research lies not only in the theoretical review but also in the implementation illustrations that can be used as a basis for education and the initial development of blockchain-based digital payment systems. The research results show that ECDSA is capable of providing a high level of efficiency in the encryption and transaction verification process, maintaining data integrity and authenticity, and supporting a decentralized and transparent system. The academic simulations included the KYC process, wallet creation using ECDSA keys, balance top-ups through bank integration, transaction creation and validation, and block recording in the blockchain. Specifically, the simulations successfully demonstrated how new blocks are added to the chain by referencing the previous block's hash, as well as how transactions with corrupted signatures, manipulated amounts, or insufficient balances are automatically rejected by the validator consensus mechanism, maintaining system integrity. This research contributes not only theoretically, but also through conceptual representations that can be used as an educational foundation and for the initial development of blockchain-based digital payment systems in Indonesia.

Pada masa sekarang semua orang, baik di Indonesia ataupun diseluruh dunia pasti membutuhkanuang untuk memenuhi kebutuhan dalam hidupnya, dengan kata lain peran uang sangat penting. Denganuang setiap orang dapat memenuhi kebutuhan hidupnya.Pada waktu seseorang membeli barang atau yang lainnya, yang membutuhkan transaksi uang tunai,kadang-kadang sering terjadi kekeliruan karena hampir samanya warna uang yang akan dibayarkan. Hal initentu akan merugikan orang pada waktu melakukan pembayaran suatu barangKekeliruan juga bisa saja terjadi di mana saja, seperti misalnya  pada waktu terjadi pembayaran tunaiyang menggunakan uang kertas, atau juga transaksi-transaksi lain yang membutuhkan identifikasi uangkertas secara cepat dan akurat, meskipun uang itu dikirim atau diterima pada waktu transaksi masih dalamkeadaaan acak atau tidak dikelompokkan terlebih dahulu.Pada idetifikasi uang kertas ini nanti yang akan dilakukan adalah tahap-tahap pengolahan sepertiperbaikan citra (enhancement), segmentasi dan pencocokan. Dengan adanya identifikasi uang kertas ini,diharapkan komputer dapat mengenali uang kertas, meskipun uang tersebut tidak dikelompok-kelompokkan atau acak.