My research is centered on the future of decentralized networks, focusing on blockchain technology, Decentralized Digital Identity (DID), and asset tokenization. As a Ph.D. candidate and an active researcher in Brazil's leading R&D telecommunications center, I investigate the technical foundations of trustworthy distributed systems. My specific interests include the architectural design and monitoring of permissioned blockchain networks (utilizing frameworks like Hyperledger Besu), the evaluation of complex smart contracts, and cloud-native deployments. I am particularly interested in applying these decentralized technologies to solve high-impact challenges, such as environmental asset tokenization and sovereign data management, aiming to advance resilient network infrastructures.
EDUCATION
Phd Student at Federal University of Para
RESEARCH, TEACHING, or OTHER INTERESTS
Computer Networks and Communications, Computer Science
Hybrid Architecture for Spectrum Access Systems With Permissioned Blockchain Alan Tony Souza Veloso, Jeffson Celeiro Sousa, Diego Medeiros De Abreu, Filipe De Oliveira Saraiva, Antônio Jorge Gomes Abelém IEEE Access, 2026 Dynamic spectrum sharing is a cornerstone of Beyond 5G (B5G) networks, yet current Spectrum Access System (SAS) coordination relies on bilateral trust and complex mesh integrations that scale quadratically (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">O</i>(<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i><sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>)). This paper presents a hybrid architecture that integrates a permissioned blockchain into SAS coordination, transforming the topology into a linear (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">O</i>(<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i>)) shared-state model. By explicitly decoupling temporal domains, the architecture preserves low-latency REST APIs for operational spectrum requests while migrating regulatory synchronization to a distributed auditable ledger. Validated through a functional prototype, our results demonstrate that while the blockchain layer introduces higher latency than REST baselines, the performance trade-offs are fully compatible with asynchronous synchronization requirements. Furthermore, the event-driven ledger model improves bandwidth efficiency by approximately 55 times compared to traditional redundant full-dump exchanges. More importantly, the proposed architecture establishes a foundational governance layer that enables passive auditability and forensic readiness, transitioning spectrum management from a legacy trust-based model to a verifiable, proof-based cryptographic environment.
A Privacy-Preserving and Secure Monitoring Framework for Permissioned Blockchain Networks Jeffson C. Sousa, Alan Veloso, Mateus Bastos, Bruno Evaristo, Antônio J. G. Abelém 2025 7th International Conference on Blockchain Computing and Applications Bcca 2025, 2025 This work proposes a decentralized monitoring architecture for blockchain networks, focusing on the inclusion of a privacy layer for permissioned environments. The solution replaces centralized monitoring systems by enabling nodes to selectively and securely share performance metrics. The federated approach ensures participant autonomy, protection of sensitive data, and improved network resilience. This contributes to strengthening distributed governance and provides a scalable, privacy-aware and and experimentally validated alternative for secure blockchain monitoring.
Impacts of RBB Topology on Blockchain Scalability Jeffson Celeiro Sousa, Bruno Evaristo, Antonio Mateus de Sousa, Ismael Ávila, Rayan G. Lima Proceedings 2025 IEEE 36th International Symposium on Software Reliability Engineering Workshops Issrew 2025, 2025 Decentralized Digital Identity (DDI) solutions are constantly evolving, and national-scale blockchain networks are beginning to develop their solutions. This article discusses the performance impact of the Indy Besu DDI framework deployed on the Rede Blockchain Brazil (RBB).
A Decentralized Marketplace with Self-Sovereign Identities for Telecommunication Services Jeffson C. Sousa, Bruno Evaristo, Vinicius Duarte, Mauricio Pinto, Alan Veloso, Antônio J. G. Abelém 2025 7th International Conference on Blockchain Computing and Applications Bcca 2025, 2025 Blockchain technology has established itself as a decentralized solution capable of ensuring security, transparency, and robust process validation, profoundly transforming various sectors. This work proposes the development of an innovative marketplace for the telecommunications sector, based on blockchain, with the aim of providing a dynamic catalog of telecom services and assets. The platform enables asset and service providers to publish offers for physical resources-such as towers, antennas, and links-within an integrated market. These resources can be hired by third parties under Business-to-Business (B2B) and Business-to-Consumer (B2C) models. The architecture incorporates decentralized identity (DID), smart contracts for asset tokenization and automated billing, and a lightweight frontend. Built on Hyperledger Besu and integrated with Ethereum-compatible libraries, the system fosters digital governance, interoperability, and the sustainable use of underutilized physical assets.
Performance Evaluation of Decentralized Digital Identity Contracts on Ethereum-Based Blockchain Networks Jeffson C. Sousa, Bruno Evaristo, Antonio Mateus, Ismael Ávila, Alan Veloso, Antonio J. G. Abelém 2025 7th International Conference on Blockchain Computing and Applications Bcca 2025, 2025 This paper presents a performance evaluation of smart contracts designed for managing decentralized digital identities on Ethereum-based blockchain networks. The analysis focuses on core identity lifecycle operations such as creation, update, credential schema definition, and revocation control, all implemented through Solidity smart contracts. Two execution contexts were considered: an environment using Hyperledger Besu operating in permissioned mode, and a reference to the traditional Hyperledger Indy model. The tests were conducted in a private network simulating different load levels and consensus configurations. The evaluated metrics include response time, throughput, resource usage, and scalability. The results provide insights to support the selection of efficient architectures for digital identity solutions based on Self-Sovereign Identity (SSI) and Ethereum, particularly in enterprise or regulated environments.
Demo: A Decentralized Marketplace with Self-Sovereign Identities for Telecommunication Services Jeffson C. Sousa, Elder Bruno Correa, Alan Veloso, Vinicius Duarte, Mauricio Pinto, Antônio Abelém 2025 IEEE International Conference on Blockchain and Cryptocurrency Icbc 2025, 2025 This demo presents a functional blockchain system for decentralized sharing of telecommunications infrastructure. The platform enables asset and service providers to publish offers for physical resources—such as towers, antennas, and links—within an integrated marketplace. These resources can be contracted by third parties in B2B and B2C models. The architecture features decentralized identity (DID), smart contracts for asset tokenization and automated billing, and a lightweight frontend. Built on Hyperledger Besu and integrated with Ethereum-compatible libraries, the system fosters digital governance, interoperability, and sustainable use of underutilized physical assets.
Demo: Blockchain-based Architecture for Renewable Energy Certificates Jeffson Sousa, Vinicius Duarte, Daniel Robson Pinto, Mauricio Pinto, Fabio Taniguchi, Ismael Á Vila, Anderson Parreira, Patricia Gardim, Rodrigo Soprano, Fernanda Jordão, Viviane Petito, Silvia Marion 7th Conference on Blockchain Research and Applications for Innovative Networks and Services Brains 2025, 2025 This paper presents a blockchain-based architecture for tokenizing I-RECs, ensuring transparency, security, and lifecycle automation. Smart contracts prevent fraud and double trading, while integration with platforms like TOTUM guarantees authenticity. A proof of concept validates the solution’s traceability and scalability.
MinIndy: Automating the Deployment and Management of Hyperledger Indy Networks Mateus Bastos, Alan Veloso, Jeffson Sousa, Bruno Evaristo, Diego Abreu, Antônio Abelém 2024 IEEE Latin American Conference on Communications Latincom 2024 Proceedings, 2024 The Hyperledger Indy blockchain platform, aimed at identity management networks, has gained importance, but the traditional, manual approach to network management is slow and error-prone. To reduce this, this paper presents MinIndy, a framework designed to automate the installation, configuration, and management of Indy networks without sacrificing performance. Therefore, MinIndy is a viable alternative for individuals and organizations looking to adopt Indy blockchain networks with less manual intervention. It was evaluated through the performance of its network and the results show that the network built with the framework has no loss of performance compared to one built without it.
RECENT SCHOLAR PUBLICATIONS
Análise de Desempenho no Hyperledger Besu: Impacto de Parâmetros via Benchmarking utilizando Caliper VS Mendes, AN de Freitas, GS Bom, JC Sousa Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 15-28 , 2026 2026
Análise Comparativa do Desempenho de LLMs e Ferramentas de Segurança na Detecção de Vulnerabilidades em Contratos Inteligentes EVA da Costa, CAM Guzman, OBM de Abreu, JC Sousa, A Braga Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 1-14 , 2026 2026
Avaliaçao Multidimensional de Infraestruturas Blockchain: Metodologia Experimental e Análise de Trade-offs B Evaristo, AM de Sousa, JC Sousa, I Avila Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 29-42 , 2026 2026
Modelo de Autenticação Descentralizada para Chamadas em Smartphones baseada em Credenciais Verificáveis e Blockchain JC Sousa, AM de Sousa, S Sales, B Evaristo, I Ávila Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 57-69 , 2026 2026
Distributed Spectrum Coordination using Decoupled Permissioned Blockchains A Veloso, J Sousa, F Saraiva, A Abelém Workshop de Pesquisa Experimental da Internet do Futuro (WPEIF), 1-8 , 2026 2026
for Communication Between Spectrum A Veloso, J Sousa, D Abreu¹, A Freitas Dependable and Secure Computing: 14th Latin-American Symposium, LADC 2025 … , 2026 2026
Hybrid Architecture for Spectrum Access Systems with Permissioned Blockchain A Veloso, J Sousa, D Abreu, F Saraiva, A Abelém IEEE Access , 2026 2026
Blockchain-based Architecture for Renewable Energy Certificates J Sousa, V Duarte, DR Pinto, M Pinto, F Taniguchi, IÁ Vila, A Parreira, ... 2025 7th Conference on Blockchain Research & Applications for Innovative … , 2025 2025
A Blockchain-Based Architecture for Communication Between Spectrum Access Systems A Veloso, J Sousa, D Abreu, A Freitas, A Abelém Latin-American Symposium on Dependable Computing, 133-147 , 2025 2025
An API-Driven Framework for Performance Testing of Hyperledger Besu Blockchain Networks C Cardoso, C Silva, A Veloso, J Sousa, A Abelém Latin-American Symposium on Dependable Computing (LADC), 23-28 , 2025 2025 Citations: 1
Blockchain na Era Quântica: Uma Rapid Review sobre Avanços, Lacunas e Direções Futuras M Bastos, A Veloso, D Abreu, J Sousa, B Evaristo, A Abelém Latin-American Symposium on Dependable Computing (LADC), 11-16 , 2025 2025
Impacts of RBB Topology on Blockchain Scalability JC Sousa, B Evaristo, AM de Sousa, I Ávila, RG Lima 2025 IEEE 36th International Symposium on Software Reliability Engineering … , 2025 2025
A Privacy-Preserving and Secure Monitoring Framework for Permissioned Blockchain Networks JC Sousa, A Veloso, M Bastos, B Evaristo, AJG Abelém 2025 7th International Conference on Blockchain Computing and Applications … , 2025 2025
Performance Evaluation of Decentralized Digital Identity Contracts on Ethereum-Based Blockchain Networks JC Sousa, B Evaristo, A Mateus, I Ávila, A Veloso, AJG Abelém 2025 7th International Conference on Blockchain Computing and Applications … , 2025 2025 Citations: 1
A Decentralized Marketplace with Self-Sovereign Identities for Telecommunication Services JC Sousa, B Evaristo, V Duarte, M Pinto, A Veloso, AJG Abelém 2025 7th International Conference on Blockchain Computing and Applications … , 2025 2025
Sincronização Descentralizada entre Sistema de Acesso ao Espectro via Blockchain A Veloso, J Sousa, D Abreu, A Abelém Seminário Integrado de Software e Hardware (SEMISH), 453-464 , 2025 2025
D-MTS: Um Sistema Baseado em Blockchain para Compartilhamento Eficiente e Transparente de Infraestrutura de Redes de Telecomunicações JC Sousa, A Veloso, B Evaristo, V Duarte, M Pinto, A Abelem Seminário Integrado de Software e Hardware (SEMISH), 609-620 , 2025 2025
Avaliação de Arquitetura e Performance de Contratos para Identidade Digital Descentralizada em Redes Blockchain Permissionadas JC Sousa, B Evaristo, AM de Sousa, I Ávila Seminário Integrado de Software e Hardware (SEMISH), 597-608 , 2025 2025
Uma Arquitetura Distribuída para Sistemas de Acesso ao Espectro com Blockchain A Veloso, J Sousa, D Abreu, A Abelém Colóquio em Blockchain e Web Descentralizada (CBlockchain), 43-48 , 2025 2025
Abordagens de Monitoramento Estruturado em Camadas para Redes Blockchain M Bastos, A Veloso, J Sousa, D Abreu, A Abelém Colóquio em Blockchain e Web Descentralizada (CBlockchain), 37-42 , 2025 2025
MOST CITED SCHOLAR PUBLICATIONS
Minindy: Automating the deployment and management of hyperledger indy networks M Bastos, A Veloso, J Sousa, B Evaristo, D Abreu, A Abelém 2024 IEEE Latin-American Conference on Communications (LATINCOM), 1-6 , 2024 2024 Citations: 6
An evaluation of Security Features based on Iso/Iec 25023 for a Distributed Autonomic Scientific Publisher Tool on a Permissioned Blockchain EBE Correa, JC Sousa, AJG Abelém, SRB Oliveira JISTEM-Journal of Information Systems and Technology Management 19, e202219020 , 2022 2022 Citations: 6
Solução descentralizada de compartilhamento de infraestrutura de redes baseada em blockchain JC Sousa, V Duarte, M Pinto, B Evaristo, JR Formigoni Filho XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT … , 2024 2024 Citations: 5
Minindy: Um framework para automatizar a implantação e o gerenciamento de redes blockchain hyperledger indy A Veloso, J Sousa, B Evaristo, D Abreu, F Saraiva, A Abelém Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 55-68 , 2024 2024 Citations: 3
Soluções de monitoramento de redes blockchain: Uma revisão sistemática da literatura M Bastos, C Silva, A Veloso, J Celeiro, B Evaristo, JR Formigoni, ... Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 69-82 , 2024 2024 Citations: 2
MinIndy: Uma Ferramenta de In\'icio R\'apido do Hyperledger Indy A Veloso, J Sousa, B Evaristo, A Abelém arXiv preprint arXiv:2311.16263 , 2023 2023 Citations: 2
An API-Driven Framework for Performance Testing of Hyperledger Besu Blockchain Networks C Cardoso, C Silva, A Veloso, J Sousa, A Abelém Latin-American Symposium on Dependable Computing (LADC), 23-28 , 2025 2025 Citations: 1
Performance Evaluation of Decentralized Digital Identity Contracts on Ethereum-Based Blockchain Networks JC Sousa, B Evaristo, A Mateus, I Ávila, A Veloso, AJG Abelém 2025 7th International Conference on Blockchain Computing and Applications … , 2025 2025 Citations: 1
Avaliação de performance de contratos de identidade digital descentralizada em redes blockchain baseada em ethereum JC Sousa, B Evaristo, AM de Sousa, I Ávila Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 57-69 , 2025 2025 Citations: 1
The use of realistic simulation in the training of lay people in Basic Life Support: experience report F Lima, I Raiol, T Vasconcelos, A Quintino, K Pinho, R Pimenta, R Ribeiro, ... International Journal of Advanced Engineering Research and Science 7 (9 … , 2020 2020 Citations: 1
Análise de Desempenho no Hyperledger Besu: Impacto de Parâmetros via Benchmarking utilizando Caliper VS Mendes, AN de Freitas, GS Bom, JC Sousa Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 15-28 , 2026 2026
Análise Comparativa do Desempenho de LLMs e Ferramentas de Segurança na Detecção de Vulnerabilidades em Contratos Inteligentes EVA da Costa, CAM Guzman, OBM de Abreu, JC Sousa, A Braga Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 1-14 , 2026 2026
Avaliaçao Multidimensional de Infraestruturas Blockchain: Metodologia Experimental e Análise de Trade-offs B Evaristo, AM de Sousa, JC Sousa, I Avila Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 29-42 , 2026 2026
Modelo de Autenticação Descentralizada para Chamadas em Smartphones baseada em Credenciais Verificáveis e Blockchain JC Sousa, AM de Sousa, S Sales, B Evaristo, I Ávila Workshop em Blockchain: Teoria, Tecnologias e Aplicações (WBlockchain), 57-69 , 2026 2026
Distributed Spectrum Coordination using Decoupled Permissioned Blockchains A Veloso, J Sousa, F Saraiva, A Abelém Workshop de Pesquisa Experimental da Internet do Futuro (WPEIF), 1-8 , 2026 2026
for Communication Between Spectrum A Veloso, J Sousa, D Abreu¹, A Freitas Dependable and Secure Computing: 14th Latin-American Symposium, LADC 2025 … , 2026 2026
Hybrid Architecture for Spectrum Access Systems with Permissioned Blockchain A Veloso, J Sousa, D Abreu, F Saraiva, A Abelém IEEE Access , 2026 2026
Blockchain-based Architecture for Renewable Energy Certificates J Sousa, V Duarte, DR Pinto, M Pinto, F Taniguchi, IÁ Vila, A Parreira, ... 2025 7th Conference on Blockchain Research & Applications for Innovative … , 2025 2025
A Blockchain-Based Architecture for Communication Between Spectrum Access Systems A Veloso, J Sousa, D Abreu, A Freitas, A Abelém Latin-American Symposium on Dependable Computing, 133-147 , 2025 2025
Blockchain na Era Quântica: Uma Rapid Review sobre Avanços, Lacunas e Direções Futuras M Bastos, A Veloso, D Abreu, J Sousa, B Evaristo, A Abelém Latin-American Symposium on Dependable Computing (LADC), 11-16 , 2025 2025
