Brazil's National Data Processing Service (Serpro) has developed a private blockchain to implement identification documents in the states of Rio de Janeiro, Goiás, and Paraná. The initiative aims to enhance security and transparency in the management of citizens' personal data, while also reducing the risk of fraud and identity theft. This marks a significant step in the adoption of blockchain technology for public services in Brazil, demonstrating the potential of distributed ledger technology to improve efficiency and trust in government processes. Further expansion of the project to other states and sectors will depend on the success of this initial implementation.