The Spanish Guardia Civil needed a secure and reliable way to register crime scenes, track evidence, and guarantee the chain of custody from the moment evidence is collected until it is presented in court.
Transform paper workflow into a digital solution.
Reduce cognitive load at the crime scene so users can focus on the investigation, while the system enforces traceability, integrity, and legal compliance in the background.
Evidence registered through the platform is legally admissible.
Product Owner and Project Manager.
Define the problem context
The existing workflow used paper forms and manual signatures, which posed risks to accuracy, traceability, and legal reliability.
The key risk wasn’t purely technical — judicial acceptance of digital records was paramount.
Mapping requirements
Worked with stakeholders to define the workflow and understand each step of the investigation to better adapt the solution.
Studied how evidence is evaluated and accepted in Spanish and European court systems.
Worked with expert lawyers to research legal precedents and regulations around digital evidence and custody tracking.
Worked to translate blockchain guarantees (immutability, traceability) into legally meaningful terms.
Legal discovery over typical UX research
Focused on understanding the legal perspective: how judges, prosecutors, and the Ministry of Justice view evidence integrity and record admissibility.
Engaged legal specialists to validate that the technology will hold up under judicial scrutiny.
Implement and deliver the platform
Built a web portal and mobile app for on-site evidence capture and tracking. The app had an offline mode so investigators can work in remote location without network signal.
Integrated a blockchain-based history trail that is auditable and tamper-resistant.
Ensured complete traceability of every piece of evidence from scene to court.
The following next steps were:
Integration with external laboratories and providers.
Integration with Ministry of Justice.
Improvement of custody workflow, adding new actors.
I came up with possible next steps for the project:
Use of AI to identify elements in images.
Integrate an AI agent to support the users during investigation.
Use of AI to manage material and agents availability.
This project taught me that in mission-critical public systems, trust, legality, and clarity matter more than features, and that product management often means bridging technology, law, and real-world human behavior.
It was also the first time I was working with blockchain and managing a project of that scale.