Introduction Detecting malicious activity in cryptocurrency networks like Bitcoin relies on datasets labeled with licit and illicit transactions. However, these datasets often suffer from class imbalance: the number of...
Introduction Ring Signatures Overview The main idea behind ring signatures is that a user $u$, who is part of a user group $$R = {\,u_1,\,u_2,\,\dots,\,u_i},$$ can sign a message...
During my initial research period at UAB, I began developing a replica of the real Bitcoin mainnet. While this might sound unusual—especially given the existence of testnet and regtest...
📊 Bitcoin’s Decentralization: What the Data Really Says Bitcoin is intended to be a decentralized, trustless peer-to-peer currency. But how decentralized is the network, really, 15 years after its creation? This...
The Lightning Network (LN) is a dynamic and constantly evolving second-layer scaling solution for Bitcoin, designed to enable fast, low-cost transactions. Recently, the network has introduced the “[ERR] HSWC:...
By Ghazaleh Keshavarzkalhori, Cristina Perez-Sola, Guillermo Navarro-Arribas, Jordi Herrera-Joancomartí, and Habib Yajam In a world where data privacy is more important than ever, federated learning has emerged as a powerful way...
We are currently conducting research on wallet fingerprinting in Bitcoin. In this work, we delve on the way that several Bitcoin wallets construct and sign transactions, and we study...
Some time ago, we proposed a mechanism to address a long-standing issue in Bitcoin: the vulnerability of zero-confirmation (0-conf) transactions to double-spending attacks. Zero-confirmation transactions are transactions that merchants...
We’ve recently submitted our latest paper to the 2025 7th International Conference on Blockchain Computing and Applications (BCCA), which will take place in Croatia. In this work, we explore how machine...
How GroupHug works, a server programmed in Rust that allows grouping or batching of transactions without interaction between users using SigHash Single | AnyoneCanPay With the intention of trying...