\documentclass[tikz,border=6pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,positioning,calc}
\definecolor{ink}{HTML}{111827}
\definecolor{blue}{HTML}{2563EB}
\definecolor{green}{HTML}{059669}
\definecolor{paper}{HTML}{FFFDF7}
\begin{document}
\begin{tikzpicture}[>=Latex, font=\small, text=ink]
  \fill[paper] (-0.5,-1.75) rectangle (9.5,2.15);
  \node[draw=ink!35, rounded corners=3pt, fill=paper, minimum width=1.6cm, minimum height=0.85cm] (m) at (0.9,0) {$Vote(B,v)$};
  \foreach \i/\y in {1/1.2,2/0.4,3/-0.4,4/-1.2} {
    \node[draw=blue!55, rounded corners=3pt, fill=blue!8, minimum width=1.4cm] (r\i) at (3.05,\y) {$\sigma_{\i}$};
    \draw[->, blue!70] (m.east) -- (r\i.west);
  }
  \node[draw=green!65, rounded corners=3pt, fill=green!10, align=center, minimum width=2.1cm, minimum height=1cm] (qc) at (6.0,0) {$QC(B,v)$\\[-1mm]\scriptsize $2f+1$ firmas};
  \foreach \i in {1,2,3,4} {
    \draw[->, green!70] (r\i.east) -- (qc.west);
  }
  \node[draw=ink!35, rounded corners=3pt, fill=paper, align=center, minimum width=2.05cm] (verify) at (8.3,0) {verificar con\\ \scriptsize clave p\'ublica umbral\\[-1mm]\scriptsize del comit\'e};
  \draw[->, ink!70] (qc.east) -- (verify.west);
  \node[font=\footnotesize, align=center] at (4.8,-1.55) {threshold signature: muchas replicas firman la misma afirmacion};
\end{tikzpicture}
\end{document}
