Tag dossier
Badge records tagged with Madrid, across Spain.
Source-backed RGB LED-matrix event badge
SEIF-UAM's public C1B3RTR4CKS 2026 badge repository documents an event badge with a CH32V003 RISC-V microcontroller, 8×16 RGB LED matrix, five-button control surface, public C firmware, games, and a personal-name marquee. The official event site and a contemporaneous attendee report place the physical artifact at the completed May 29 Madrid event; final allocation and production details are not public.
Spanish ESP32 PACMAN CTF badge with project-builder and community-reversal evidence
RootedCON 2026's PACMAN-themed attendee CTF badge is documented by both community reversals and a first-hand TechFrontiers project-builder write-up. David Melendez Cano reports original colored Ghost boards that attendees could choose, an ESP32-WROOM-32 platform, ESP-NOW game-server interaction, per-badge NVS identity/key material, and digitally signed questions and answers. Community reversals independently identify an ESP32-D0WD-V3, 1.77-inch ST7735 128x160 display, directional controls, and native quiz-server CTF protocol for the March 5-7 sixteenth edition at Kinepolis Madrid.
Madrid Hackplayers electronic development-board CTF badge
A source-backed Spanish hacker-conference electronic badge record: the official h-c0n post says Hackplayers finally produced an electronic badge for the sixth 2026 edition, describes it as a fully functional development board, and ties pickup to the February 6 conference registration and CTF start; the public `therealdreg/hcon2026hwctf` repository and Hackplayers post-event write-up document RP2350/RISC-V firmware, tooling, named co-creators, and winner write-ups.