diff --git a/inputs/lecture_02.tex b/inputs/lecture_02.tex
index d7c6879..985b39c 100644
--- a/inputs/lecture_02.tex
+++ b/inputs/lecture_02.tex
@@ -40,7 +40,7 @@
     \label{lem:closedaccumulation}
     A set $A \subseteq  \R$ is closed iff $A' \subseteq  A$.
 \end{lemma}
-\begin{refproof}{lem:closedaccumulation}
+\begin{yarefproof}{lem:closedaccumulation}
     ``$\implies$''
     \gist{%
     Let $A$ be closed. Suppose that $x \in A' \setminus A$.
@@ -75,7 +75,7 @@
     there would be some Cauchy-sequence $(x_n)$
     in $A$ such that $\lim_{n \to  \infty} x_n \not\in A$.
     But then $x \in A' \subseteq A \lightning$.
-\end{refproof}
+\end{yarefproof}
 \begin{definition}
     $P \subseteq  \R$ (or, more generally, a subset of any topological space)
     is called \vocab{perfect}
diff --git a/inputs/lecture_03.tex b/inputs/lecture_03.tex
index b740841..984d9b1 100644
--- a/inputs/lecture_03.tex
+++ b/inputs/lecture_03.tex
@@ -37,7 +37,7 @@
 By the fact we just proved,
 all condensation points are accumulation points.
 
-\begin{refproof}{thm:cantorbendixson}
+\begin{yarefproof}{thm:cantorbendixson}
     Fix $A \subseteq \R$ closed.
     We want to see that $A$ is at most countable
     or there is some perfect $P \subseteq A$.
@@ -109,7 +109,7 @@ all condensation points are accumulation points.
     \[
         A = \overbrace{P}^{\mathclap{\text{perfect, unless $= \emptyset$}}} \cup \underbrace{(A \setminus P)}_{\mathclap{\text{at most countable}}}.
     \] 
-\end{refproof}
+\end{yarefproof}
 
 \gist{\todo{Alternative proof of Cantor-Bendixson}}{}
 % \begin{remark}
diff --git a/inputs/lecture_06.tex b/inputs/lecture_06.tex
index ee18c61..22f0160 100644
--- a/inputs/lecture_06.tex
+++ b/inputs/lecture_06.tex
@@ -7,7 +7,7 @@
     and $ b$ linearly ordered, $b$ has an upper bound.
     Then $a$ has a maximal element.
 \end{theorem}
-\begin{refproof}{thm:zorn}
+\begin{yarefproof}{thm:zorn}
     \gist{%
     Fix $(a, \le )$ as in the hypothesis.
     Let $A \coloneqq  \{ \{(b,x) : x \in b\}  : b \subseteq a, b \neq \emptyset\}$.
@@ -96,7 +96,7 @@
     \end{itemize}
 }
 
-\end{refproof}
+\end{yarefproof}
 
 \begin{remark}
     Over $\ZF$ the \yaref{ax:c} and \yaref{thm:zorn}
diff --git a/inputs/lecture_07.tex b/inputs/lecture_07.tex
index 9bb4ee5..bbe2262 100644
--- a/inputs/lecture_07.tex
+++ b/inputs/lecture_07.tex
@@ -19,7 +19,7 @@
             or $\alpha \ni \beta$.
     \end{enumerate}
 \end{lemma}
-\begin{refproof}{lem:7:ordinalfacts}
+\begin{yarefproof}{lem:7:ordinalfacts}
 \gist{
     We have already proved (a) before.
 
@@ -115,7 +115,7 @@
         as $\alpha_0 \in  \beta_0 \in \alpha_0$.
     \end{subproof}
 }{Long and tedious, but not many ideas.}
-\end{refproof}
+\end{yarefproof}
 
 \begin{lemma}
     Let $X$ be a set of ordinals,
diff --git a/inputs/lecture_11.tex b/inputs/lecture_11.tex
index d304051..d887e0f 100644
--- a/inputs/lecture_11.tex
+++ b/inputs/lecture_11.tex
@@ -137,7 +137,7 @@ so $|a| = \aleph_\beta$ for some $\beta \le |\alpha|$.
         \]
     }{Then $\aleph_{\beta} \le  \aleph_\alpha + \aleph_{\beta} \le  \aleph_\alpha \cdot \aleph_\beta \le \aleph_\beta \cdot \aleph_\beta = \aleph_\beta$.}
 \end{proof}
-\begin{refproof}{thm:hessenberg}
+\begin{yarefproof}{thm:hessenberg}
 \gist{%
     Define a well-order $<^\ast$ on $\OR \times \OR$ by setting
     \[
@@ -218,7 +218,7 @@ so $|a| = \aleph_\beta$ for some $\beta \le |\alpha|$.
             \end{itemize}
     \end{itemize}
 }
-\end{refproof}
+\end{yarefproof}
 \gist{%
 However, exponentiation of cardinals is far from trivial:
 \begin{observe}
diff --git a/inputs/lecture_14.tex b/inputs/lecture_14.tex
index dcfc009..937e5f1 100644
--- a/inputs/lecture_14.tex
+++ b/inputs/lecture_14.tex
@@ -37,7 +37,7 @@
     Clearly this is club
     but $\bigcap_{\beta < \kappa} C_\beta = \emptyset$.
 \end{warning}
-\begin{refproof}{lem:clubintersection}
+\begin{yarefproof}{lem:clubintersection}
 \gist{%
     First let $\alpha = 2$.
     Let $C, D \subseteq \kappa$
@@ -97,7 +97,7 @@
         (we used $\cf(\kappa) > \alpha\cdot \omega$).
     \end{itemize}
 }
-\end{refproof}
+\end{yarefproof}
 
 \begin{definition}
     $F \subseteq  \cP(a)$ is a \vocab{filter}
@@ -172,7 +172,7 @@ We have shown (assuming \AxC to choose contained clubs):
     then $\diagi_{\beta < \kappa} C_{\beta}$
     contains a club.
 \end{lemma}
-\begin{refproof}{lem:diagiclub}
+\begin{yarefproof}{lem:diagiclub}
     % TODO THINK
 \gist{
     Let us fix $\langle C_{\beta} : \beta < \alpha \rangle$.
@@ -277,7 +277,7 @@ We have shown (assuming \AxC to choose contained clubs):
     \end{itemize}
 
 }
-\end{refproof}
+\end{yarefproof}
 \begin{remark}+
     $\diagi_{\beta < \kappa} C_{\beta}$ actually
     \emph{is} a club,
diff --git a/inputs/lecture_15.tex b/inputs/lecture_15.tex
index a4af044..420e20c 100644
--- a/inputs/lecture_15.tex
+++ b/inputs/lecture_15.tex
@@ -105,7 +105,7 @@ to be an elementary substructure of $V_\theta$.
 \end{lemma}
 
 Let's do a second proof of \yaref{thm:fodor}.
-\begin{refproof}{thm:fodor}
+\begin{yarefproof}{thm:fodor}
 \gist{%
     Fix $\theta > \kappa$ and look at $V_{\theta}$.
 
@@ -151,7 +151,7 @@ Let's do a second proof of \yaref{thm:fodor}.
         such that $X_\xi \cap \kappa = \xi$
         for all $\xi \in C$.
     \end{claim}
-    \begin{refproof}{thm:fodor:p2:c1}
+    \begin{yarefproof}{thm:fodor:p2:c1}
         Write $C = \{\xi < \kappa:X_\xi \cap \kappa = \xi\}$.
         Trivially $C$ is closed.
         Let us show that $C$ is unbounded in $\kappa$.
@@ -171,7 +171,7 @@ Let's do a second proof of \yaref{thm:fodor}.
             \label{thm:fodor:p2:c1.1}
             $\xi \in C$, i.e.~$X_\xi \cap \kappa = \xi$.
         \end{claim}
-        \begin{refproof}{thm:fodor:p2:c1.1}
+        \begin{yarefproof}{thm:fodor:p2:c1.1}
             If $\eta < \xi$,
             then $\eta < \xi_n$ for some $n$
             and then $\eta \in \xi_n \subseteq X_{\xi_n} \subseteq X_{\xi}$.
@@ -180,8 +180,8 @@ Let's do a second proof of \yaref{thm:fodor}.
             Then $\eta \in X_{\xi_n}$ for some $n < \omega$,
             so $\eta < \xi_{n+1} < \xi$,
             hence $X_{\xi} \cap \kappa \subseteq \xi$.
-        \end{refproof}
-    \end{refproof}
+        \end{yarefproof}
+    \end{yarefproof}
     Now let $\alpha \in S \cap C$,
     i.e.~$X_\alpha \prec V_{\theta}$
     and $\alpha = X_{\alpha} \cap \kappa$.
@@ -280,4 +280,4 @@ Let's do a second proof of \yaref{thm:fodor}.
             \end{itemize}
     \end{itemize}
 }
-\end{refproof}
+\end{yarefproof}
diff --git a/inputs/lecture_16.tex b/inputs/lecture_16.tex
index d4ffb15..ccb7c01 100644
--- a/inputs/lecture_16.tex
+++ b/inputs/lecture_16.tex
@@ -101,7 +101,7 @@ one cofinality.
 
 
 
-\begin{refproof}{thm:solovay}%
+\begin{yarefproof}{thm:solovay}%
 \gist{%
     \footnote{``This is one of the arguments where it is certainly worth it to look at it again.''}
     We will only prove this for $\aleph_1$.
@@ -253,7 +253,7 @@ one cofinality.
         \item $S_0 \coloneqq T_0 \cup \left( S \setminus \bigcup_{j > 0} T_j \right)$, $S_i \coloneqq  T_i$.
     \end{itemize}
 }
-\end{refproof}
+\end{yarefproof}
 \gist{%
 We now want to do another application of \yaref{thm:fodor}.
 Recall that $2^{\kappa} > \kappa$, in fact $\cf(2^{\kappa}) > \kappa$
diff --git a/inputs/lecture_17.tex b/inputs/lecture_17.tex
index 4ed2f66..e0d1558 100644
--- a/inputs/lecture_17.tex
+++ b/inputs/lecture_17.tex
@@ -25,7 +25,7 @@ We will only prove
 \end{remark}
 }{}
 
-\begin{refproof}{thm:silver1}
+\begin{yarefproof}{thm:silver1}
 \gist{%
     We need to count the number of $X \subseteq \aleph_{\omega_1}.$
     Let us fix $\langle f_\lambda : \lambda < \kappa \text{ an infinite cardinal} \rangle$
@@ -274,4 +274,4 @@ We will only prove
     \end{itemize}
 }
 
-\end{refproof}
+\end{yarefproof}
diff --git a/inputs/lecture_23.tex b/inputs/lecture_23.tex
index 8f275f3..2f32611 100644
--- a/inputs/lecture_23.tex
+++ b/inputs/lecture_23.tex
@@ -73,7 +73,7 @@ We shall prove:
         \footnote{Being a cardinal is  $\Pi_1$,
             so $M[h]$ cardinals are always $M$ cardinals.}
 \end{claim}
-\begin{refproof}{l23:c:2}
+\begin{yarefproof}{l23:c:2}
     Suppose not.
     Let $\kappa$ be minimal such that $M \models \text{``$\kappa$ is a cardinal''}$,
     but $M[h] \models \text{``$\kappa$ is not a cardinal''}$.
@@ -119,12 +119,12 @@ We shall prove:
     But $|\lambda \times \omega| = |\lambda| = \lambda$,
     so in $M$ there is a surjection $F' \colon  \lambda \to  \kappa$,
     but $\kappa$ is a cardinal in $M$ $\lightning$.
-\end{refproof}
+\end{yarefproof}
 
-\begin{refproof}{l23:c:1}
+\begin{yarefproof}{l23:c:1}
     Omitted.
     % TODO combinatorial argument
-\end{refproof}
+\end{yarefproof}
 
 
 
diff --git a/jrpie-yaref.sty b/jrpie-yaref.sty
index d7347cd..5c21fa8 100644
--- a/jrpie-yaref.sty
+++ b/jrpie-yaref.sty
@@ -5,6 +5,48 @@
 \RequirePackage{amstext}
 \RequirePackage{xspace}
 
+\newwrite\yaref@output
+\immediate\openout\yaref@output=\jobname.yaref.json
+\write\yaref@output{data = [}
+
+\newcounter{yarefproof@depth}
+\setcounter{yarefproof@depth}{0}
+
+\edef\yaref@hastag{\string#}%
+
+\let\yaref@oldlabel\label
+\def\publicurl{https://josia-notes.users.abstractnonsen.se/w23-logic-2/logic2.pdf}
+
+\newenvironment{yarefproof}[1]{%
+    \ifnum\the\value{yarefproof@depth}=0%
+        \global\def\yarefproof@current{#1}%
+    \fi%
+    \addtocounter{yarefproof@depth}{1}%
+    \begin{refproof}{#1}% Depth: \theyarefproof@depth
+}{%
+    \end{refproof}%
+    \addtocounter{yarefproof@depth}{-1}%
+    %\ifnum\yarefproof@depth=0%
+    %    \def\yarefproof@current{nothing}%
+    %\fi%
+    %\let\yarefproof@current=\undefined%
+    \ignorespacesafterend%
+}
+
+\newcommand{\yaref@writedependency}[1]{%
+    \ifnum\the\value{yarefproof@depth}=0%
+        % not in a proof environment
+        %\write\yaref@output{EDGE: #1 - \theyarefproof@depth}%
+    \else%
+        \ifcsname yarefproof@current\endcsname%
+            \write\yaref@output{{data: {id:"#1\yarefproof@current", source:"#1", target: "\yarefproof@current"}},}%
+        \else%
+            % in a proof env, but no label defined ???
+            %\write\yaref@output{{#1 - ERROR}}%
+        \fi%
+    \fi%
+}
+
 \newcommand{\yaref@text@large}[1]{%
     \ifcsname yaref@longlabel@#1\endcsname%
         \hyperref[#1]{\csname yaref@longlabel@#1\endcsname\ (\ref*{#1})}%
@@ -30,14 +72,16 @@
 }
 
 \newcommand{\yalabel}[3]{%
+    \yaref@oldlabel{#3}%
     \write\@auxout{\noexpand\expandafter\noexpand\gdef\noexpand\csname yaref@longlabel@#3\noexpand\endcsname{#1}}%
     \write\@auxout{\noexpand\expandafter\noexpand\gdef\noexpand\csname yaref@shortlabel@#3\noexpand\endcsname{#2}}%
+    \write\yaref@output{{data: {id: "#3", label: "#1", short: "#2", href: "\publicurl\yaref@hastag\getrefbykeydefault{#3}{anchor}{}"}},}%
     \expandafter\gdef\csname yaref@longlabel@#3\endcsname{#1}%
     \expandafter\gdef\csname yaref@shortlabel@#3\endcsname{#2}%
-    \label{#3}%
 }
 
 \newcommand{\yaref}[1]{%
+    \yaref@writedependency{#1}%
     \relax\ifmmode%
         \mathchoice
             {\yaref@math@large{#1}}      % display style
@@ -50,9 +94,17 @@
 }
 % Force a small reference
 \newcommand{\yarefs}[1]{%
+    %\yaref@writedependency{#1}%
     \relax\ifmmode%
         \yaref@math@verysmall{#1}% scriptscript style
     \else%
         \yaref@text@small{#1}\xspace%
     \fi%
 }
+\renewcommand{\label}[1]{%
+    \yaref@oldlabel{#1}%
+    % \getrefbykeydefault{#1}{name}{}
+    \write\yaref@output{{data: {id: "#1", label: "\getrefnumber{#1}", href: "\publicurl\yaref@hastag\getrefbykeydefault{#1}{anchor}{}"}},}%
+}
+
+\AtEndDocument{\write\yaref@output{{}]}}