chain_id should be spelled with a uniform font

Paper.tex

@@ -1699,7 +1699,7 @@ \section{Signing Transactions}\label{app:signing}
 \begin{align}
 0 < \linkdest{r}{r} &< \mathtt{\tiny secp256k1n} \\
 0 < \linkdest{s}{s} &< \mathtt{\tiny secp256k1n} \div 2 + 1 \\
-\hyperlink{v}{v} &\in \{27,28,\mathtt{\tiny chain\_{\mathrm{id}}} \times 2 + 35, \mathtt{\tiny chain\_{\mathrm{id}}} \times 2 + 36\}
+\hyperlink{v}{v} &\in \{27,28,\mathtt{\tiny chain\_id} \times 2 + 35, \mathtt{\tiny chain\_id} \times 2 + 36\}
 \end{align}
 where:
 \begin{align}
@@ -1716,7 +1716,7 @@ \section{Signing Transactions}\label{app:signing}
 \begin{eqnarray}
 L_{S}(T) & \equiv & \begin{cases}
 (T_{\mathrm{n}}, T_{\mathrm{p}}, T_{\mathrm{g}}, T_{\mathrm{t}}, T_{\mathrm{v}}, \mathbf{p}) & \text{if} \; v \in \{27, 28\} \\
-(T_{\mathrm{n}}, T_{\mathrm{p}}, T_{\mathrm{g}}, T_{\mathrm{t}}, T_{\mathrm{v}}, \mathbf{p}, \mathtt{\tiny chain\_{\mathrm{id}}}, (), ()) & \text{otherwise} \\
+(T_{\mathrm{n}}, T_{\mathrm{p}}, T_{\mathrm{g}}, T_{\mathrm{t}}, T_{\mathrm{v}}, \mathbf{p}, \mathtt{\tiny chain\_id}, (), ()) & \text{otherwise} \\
 \end{cases} \\
 \nonumber \text{where} \\
 \nonumber \mathbf{p} & \equiv & \begin{cases}