diff --git a/priv/static/grids-basic.html b/priv/static/grids-basic.html
index 6e76e14..db987b5 100644
--- a/priv/static/grids-basic.html
+++ b/priv/static/grids-basic.html
@@ -35,13 +35,14 @@
         <label for="grids-a">Amount (P):</label>
         <input type  = "number"
                id    = "grids-a"
-               value = "6000000">
+               value = "69"
+               disabled>
         <br>
 
         <label for="grids-p">Payload:</label>
         <input type  = "text"
                id    = "grids-p"
-               value = "test payload">
+               disabled>
         <br>
 
         <input type  = "button"
diff --git a/priv/static/js/dist/grids-basic.js b/priv/static/js/dist/grids-basic.js
index 9255f69..1b3b103 100644
--- a/priv/static/js/dist/grids-basic.js
+++ b/priv/static/js/dist/grids-basic.js
@@ -20,6 +20,10 @@ async function main() {
     let submit_btn = document.getElementById('grids-submit');
     let grids_url_elt = document.getElementById('grids-url');
     let grids_png_elt = document.getElementById('grids-png');
+    let rand_data = new Uint8Array(32);
+    window.crypto.getRandomValues(rand_data);
+    let hex = rand_data.toHex().toUpperCase();
+    p_input.value = 'text payload ' + hex;
     // Page initialization
     submit_btn.addEventListener('click', async function (e) {
         await on_submit(n_input, r_input, a_input, p_input, grids_url_elt, grids_png_elt);
diff --git a/priv/static/js/dist/grids-basic.js.map b/priv/static/js/dist/grids-basic.js.map
index 2153be8..fe5b107 100644
--- a/priv/static/js/dist/grids-basic.js.map
+++ b/priv/static/js/dist/grids-basic.js.map
@@ -1 +1 @@
-{"version":3,"file":"grids-basic.js","sourceRoot":"","sources":["../ts/grids-basic.ts"],"names":[],"mappings":";AAAA;;;;;;;;GAQG;AAEH,IAAI,EAAE,CAAC;AAGP;;GAEG;AACH,KAAK,UACL,IAAI;IAGA,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,UAAU,GAAG,QAAQ,CAAC,cAAc,CAAC,cAAc,CAAqB,CAAC;IAE7E,IAAI,aAAa,GAAG,QAAQ,CAAC,cAAc,CAAC,WAAW,CAAwB,CAAC;IAChF,IAAI,aAAa,GAAG,QAAQ,CAAC,cAAc,CAAC,WAAW,CAAqB,CAAC;IAE7E,sBAAsB;IACtB,UAAU,CAAC,gBAAgB,CACvB,OAAO,EACP,KAAK,WAAU,CAAC;QACZ,MAAM,SAAS,CAAC,OAAO,EAAE,OAAO,EAAE,OAAO,EAAE,OAAO,EAAE,aAAa,EAAE,aAAa,CAAC,CAAA;IACrF,CAAC,CACJ,CAAC;IAEF,iBAAiB;IACjB,UAAU,CAAC,QAAQ,GAAG,KAAK,CAAC;AAChC,CAAC;AAED,KAAK,UACL,SAAS,CACJ,OAAgC,EAChC,OAAgC,EAChC,OAAgC,EAChC,OAAgC,EAChC,aAAmC,EACnC,aAAgC;IAGjC,kBAAkB;IAClB,IAAI,UAAU,GAAY,OAAO,CAAC,KAAK,CAAC;IACxC,IAAI,SAAS,GAAa,OAAO,CAAC,KAAK,CAAC;IACxC,IAAI,MAAM,GAAgB,QAAQ,CAAC,OAAO,CAAC,KAAK,CAAC,CAAC;IAClD,IAAI,OAAO,GAAe,OAAO,CAAC,KAAK,CAAC;IAExC,IAAI,MAAM,GAAsB,MAAM,aAAa,CAAC,UAAU,EAAE,SAAS,EAAE,MAAM,EAAE,OAAO,CAAC,CAAC;IAE5F,yBAAyB;IACzB,IAAI,MAAM,CAAC,EAAE,EAAE;QACX,IAAI,GAAG,GAAmB,MAAM,CAAC,MAAM,CAAC,GAAG,CAAC;QAC5C,IAAI,UAAU,GAAY,MAAM,CAAC,MAAM,CAAC,UAAU,CAAC;QAEnD,IAAI,UAAU,GAAY,wBAAwB,CAAA;QAElD,IAAI,GAAG,GAAG,UAAU,GAAG,UAAU,CAAC;QAElC,aAAa,CAAC,SAAS,GAAG,GAAG,CAAC;QAC9B,aAAa,CAAC,GAAG,GAAS,GAAG,CAAC;QAE9B,aAAa,CAAC,MAAM,GAAG,KAAK,CAAC;QAC7B,aAAa,CAAC,MAAM,GAAG,KAAK,CAAC;KAChC;SACI;QACD,KAAK,CAAC,SAAS,GAAG,MAAM,CAAC,KAAK,CAAC,CAAC;KACnC;AACL,CAAC;AASD;;GAEG;AACH,KAAK,UACL,aAAa,CACR,MAAkB,EAClB,SAAkB,EAClB,MAAkB,EAClB,OAAkB;IAGnB,kCAAkC;IAClC,IAAI,GAAG,GAAiB,EAAC,YAAY,EAAG,MAAM;QACrB,WAAW,EAAI,SAAS;QACxB,QAAQ,EAAO,MAAM;QACrB,SAAS,EAAM,OAAO,EAAC,CAAC;IACjD,IAAI,QAAQ,GAAY,IAAI,CAAC,SAAS,CAAC,GAAG,EAAE,SAAS,EAAE,CAAC,CAAC,CAAC;IAG1D,IAAI,GAAG,GAAG,aAAa,CAAC;IACxB,IAAI,WAAW,GAAI,EAAC,MAAM,EAAG,MAAM;QACf,OAAO,EAAE,EAAC,cAAc,EAAE,kBAAkB,EAAC;QAC7C,IAAI,EAAK,QAAQ,EAAC,CAAC;IAGvC,IAAI,MAAM,GACF,EAAC,EAAE,EAAM,KAAK;QACb,KAAK,EAAG,kCAAkC,EAAC,CAAC;IAErD,IAAI;QACA,IAAI,QAAQ,GAAc,MAAM,KAAK,CAAC,GAAG,EAAE,WAAW,CAAC,CAAC;QACxD,IAAI,QAAQ,CAAC,EAAE;YACX,MAAM,GAAG,MAAM,QAAQ,CAAC,IAAI,EAAuB,CAAC;aACnD;YACD,OAAO,CAAC,GAAG,CAAC,oBAAoB,EAAE,QAAQ,CAAC,CAAC;YAC5C,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,mBAAmB,EAAC,CAAC;SACpD;KACJ;IACD,OAAO,CAAM,EAAE;QACX,OAAO,CAAC,GAAG,CAAC,gBAAgB,EAAE,CAAC,CAAC,CAAC;QACjC,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,eAAe,EAAC,CAAC;KAChD;IAED,OAAO,MAAM,CAAC;AAClB,CAAC"}
\ No newline at end of file
+{"version":3,"file":"grids-basic.js","sourceRoot":"","sources":["../ts/grids-basic.ts"],"names":[],"mappings":";AAAA;;;;;;;;GAQG;AAEH,IAAI,EAAE,CAAC;AAGP;;GAEG;AACH,KAAK,UACL,IAAI;IAGA,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,UAAU,GAAG,QAAQ,CAAC,cAAc,CAAC,cAAc,CAAqB,CAAC;IAE7E,IAAI,aAAa,GAAG,QAAQ,CAAC,cAAc,CAAC,WAAW,CAAwB,CAAC;IAChF,IAAI,aAAa,GAAG,QAAQ,CAAC,cAAc,CAAC,WAAW,CAAqB,CAAC;IAE7E,IAAI,SAAS,GAAgB,IAAI,UAAU,CAAC,EAAE,CAAC,CAAC;IAChD,MAAM,CAAC,MAAM,CAAC,eAAe,CAAC,SAAS,CAAC,CAAC;IACzC,IAAI,GAAG,GAAY,SAAS,CAAC,KAAK,EAAE,CAAC,WAAW,EAAE,CAAC;IACnD,OAAO,CAAC,KAAK,GAAG,eAAe,GAAG,GAAG,CAAC;IAEtC,sBAAsB;IACtB,UAAU,CAAC,gBAAgB,CACvB,OAAO,EACP,KAAK,WAAU,CAAC;QACZ,MAAM,SAAS,CAAC,OAAO,EAAE,OAAO,EAAE,OAAO,EAAE,OAAO,EAAE,aAAa,EAAE,aAAa,CAAC,CAAA;IACrF,CAAC,CACJ,CAAC;IAEF,iBAAiB;IACjB,UAAU,CAAC,QAAQ,GAAG,KAAK,CAAC;AAChC,CAAC;AAED,KAAK,UACL,SAAS,CACJ,OAAgC,EAChC,OAAgC,EAChC,OAAgC,EAChC,OAAgC,EAChC,aAAmC,EACnC,aAAgC;IAGjC,kBAAkB;IAClB,IAAI,UAAU,GAAY,OAAO,CAAC,KAAK,CAAC;IACxC,IAAI,SAAS,GAAa,OAAO,CAAC,KAAK,CAAC;IACxC,IAAI,MAAM,GAAgB,QAAQ,CAAC,OAAO,CAAC,KAAK,CAAC,CAAC;IAClD,IAAI,OAAO,GAAe,OAAO,CAAC,KAAK,CAAC;IAExC,IAAI,MAAM,GAAsB,MAAM,aAAa,CAAC,UAAU,EAAE,SAAS,EAAE,MAAM,EAAE,OAAO,CAAC,CAAC;IAE5F,yBAAyB;IACzB,IAAI,MAAM,CAAC,EAAE,EAAE,CAAC;QACZ,IAAI,GAAG,GAAmB,MAAM,CAAC,MAAM,CAAC,GAAG,CAAC;QAC5C,IAAI,UAAU,GAAY,MAAM,CAAC,MAAM,CAAC,UAAU,CAAC;QAEnD,IAAI,UAAU,GAAY,wBAAwB,CAAA;QAElD,IAAI,GAAG,GAAG,UAAU,GAAG,UAAU,CAAC;QAElC,aAAa,CAAC,SAAS,GAAG,GAAG,CAAC;QAC9B,aAAa,CAAC,GAAG,GAAS,GAAG,CAAC;QAE9B,aAAa,CAAC,MAAM,GAAG,KAAK,CAAC;QAC7B,aAAa,CAAC,MAAM,GAAG,KAAK,CAAC;IACjC,CAAC;SACI,CAAC;QACF,KAAK,CAAC,SAAS,GAAG,MAAM,CAAC,KAAK,CAAC,CAAC;IACpC,CAAC;AACL,CAAC;AASD;;GAEG;AACH,KAAK,UACL,aAAa,CACR,MAAkB,EAClB,SAAkB,EAClB,MAAkB,EAClB,OAAkB;IAGnB,kCAAkC;IAClC,IAAI,GAAG,GAAiB,EAAC,YAAY,EAAG,MAAM;QACrB,WAAW,EAAI,SAAS;QACxB,QAAQ,EAAO,MAAM;QACrB,SAAS,EAAM,OAAO,EAAC,CAAC;IACjD,IAAI,QAAQ,GAAY,IAAI,CAAC,SAAS,CAAC,GAAG,EAAE,SAAS,EAAE,CAAC,CAAC,CAAC;IAG1D,IAAI,GAAG,GAAG,aAAa,CAAC;IACxB,IAAI,WAAW,GAAI,EAAC,MAAM,EAAG,MAAM;QACf,OAAO,EAAE,EAAC,cAAc,EAAE,kBAAkB,EAAC;QAC7C,IAAI,EAAK,QAAQ,EAAC,CAAC;IAGvC,IAAI,MAAM,GACF,EAAC,EAAE,EAAM,KAAK;QACb,KAAK,EAAG,kCAAkC,EAAC,CAAC;IAErD,IAAI,CAAC;QACD,IAAI,QAAQ,GAAc,MAAM,KAAK,CAAC,GAAG,EAAE,WAAW,CAAC,CAAC;QACxD,IAAI,QAAQ,CAAC,EAAE;YACX,MAAM,GAAG,MAAM,QAAQ,CAAC,IAAI,EAAuB,CAAC;aACnD,CAAC;YACF,OAAO,CAAC,GAAG,CAAC,oBAAoB,EAAE,QAAQ,CAAC,CAAC;YAC5C,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,mBAAmB,EAAC,CAAC;QACrD,CAAC;IACL,CAAC;IACD,OAAO,CAAM,EAAE,CAAC;QACZ,OAAO,CAAC,GAAG,CAAC,gBAAgB,EAAE,CAAC,CAAC,CAAC;QACjC,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,eAAe,EAAC,CAAC;IACjD,CAAC;IAED,OAAO,MAAM,CAAC;AAClB,CAAC"}
\ No newline at end of file
diff --git a/priv/static/js/dist/libfewd.js.map b/priv/static/js/dist/libfewd.js.map
index de16114..83dbe5c 100644
--- a/priv/static/js/dist/libfewd.js.map
+++ b/priv/static/js/dist/libfewd.js.map
@@ -1 +1 @@
-{"version":3,"file":"libfewd.js","sourceRoot":"","sources":["../ts/libfewd.ts"],"names":[],"mappings":"AAAA;;;;GAIG;AAEH,OAAO,EACH,WAAW,EACX,qBAAqB,EACxB,CAAC;AAGF,SACA,WAAW,CACN,gBAAmC,EACnC,cAAsC,EACtC,UAAyB;IAG1B,+DAA+D;IAC/D,IAAI,gBAAgB,CAAC,OAAO,EAAE;QAC1B,IAAI,aAAa,GAAW,cAAc,CAAC,YAAY,CAAC;QACxD,sCAAsC;QACtC,IAAI,aAAa,GAAG,UAAU;YAC1B,cAAc,CAAC,KAAK,CAAC,MAAM,GAAG,MAAM,CAAC,aAAa,CAAC,GAAG,IAAI,CAAC;;YAE3D,cAAc,CAAC,KAAK,CAAC,MAAM,GAAG,MAAM,CAAC,UAAU,CAAC,GAAG,IAAI,CAAC;KAC/D;AACL,CAAC;AAGD,SACA,qBAAqB,CAChB,gBAAmC,EACnC,cAAsC;IAGvC,IAAI,gBAAgB,CAAC,OAAO,EAAE;QAC1B,mBAAmB;QACnB,cAAc,CAAC,SAAS,GAAG,cAAc,CAAC,YAAY,CAAC;KAC1D;AACL,CAAC"}
\ No newline at end of file
+{"version":3,"file":"libfewd.js","sourceRoot":"","sources":["../ts/libfewd.ts"],"names":[],"mappings":"AAAA;;;;GAIG;AAEH,OAAO,EACH,WAAW,EACX,qBAAqB,EACxB,CAAC;AAGF,SACA,WAAW,CACN,gBAAmC,EACnC,cAAsC,EACtC,UAAyB;IAG1B,+DAA+D;IAC/D,IAAI,gBAAgB,CAAC,OAAO,EAAE,CAAC;QAC3B,IAAI,aAAa,GAAW,cAAc,CAAC,YAAY,CAAC;QACxD,sCAAsC;QACtC,IAAI,aAAa,GAAG,UAAU;YAC1B,cAAc,CAAC,KAAK,CAAC,MAAM,GAAG,MAAM,CAAC,aAAa,CAAC,GAAG,IAAI,CAAC;;YAE3D,cAAc,CAAC,KAAK,CAAC,MAAM,GAAG,MAAM,CAAC,UAAU,CAAC,GAAG,IAAI,CAAC;IAChE,CAAC;AACL,CAAC;AAGD,SACA,qBAAqB,CAChB,gBAAmC,EACnC,cAAsC;IAGvC,IAAI,gBAAgB,CAAC,OAAO,EAAE,CAAC;QAC3B,mBAAmB;QACnB,cAAc,CAAC,SAAS,GAAG,cAAc,CAAC,YAAY,CAAC;IAC3D,CAAC;AACL,CAAC"}
\ No newline at end of file
diff --git a/priv/static/js/dist/wfc.js.map b/priv/static/js/dist/wfc.js.map
index c9cb10c..ca3d152 100644
--- a/priv/static/js/dist/wfc.js.map
+++ b/priv/static/js/dist/wfc.js.map
@@ -1 +1 @@
-{"version":3,"file":"wfc.js","sourceRoot":"","sources":["../ts/wfc.ts"],"names":[],"mappings":"AAAA;;;;GAIG;AAEH,OAAO,KAAK,OAAO,MAAM,cAAc,CAAA;AAEvC,oEAAoE;AACpE,qBAAqB;AACrB,oEAAoE;AAEpE,IAAI,EAAE,CAAC;AAEP,SACA,IAAI;IAIA,IAAI,IAAI,GAAoC,QAAQ,CAAC,cAAc,CAAC,WAAW,CAA8B,CAAK;IAClH,IAAI,IAAI,GAAoC,QAAQ,CAAC,cAAc,CAAC,YAAY,CAAgC,CAAE;IAClH,IAAI,SAAS,GAA+B,QAAQ,CAAC,cAAc,CAAC,oBAAoB,CAAqB,CAAK;IAClH,IAAI,SAAS,GAA+B,QAAQ,CAAC,cAAc,CAAC,aAAa,CAA4B,CAAK;IAClH,IAAI,eAAe,GAAyB,GAAG,CAAC;IAGhD,IAAI,CAAC,gBAAgB,CAAC,SAAS,EAC3B,UAAS,CAAgB;QACrB,YAAY,CAAC,CAAC,EAAE,IAAI,EAAE,IAAI,EAAE,SAAS,EAAE,SAAS,EAAE,eAAe,CAAC,CAAC;IACvE,CAAC,CACJ,CAAC;AACN,CAAC;AAGD,yBAAyB;AACzB,KAAK,UACL,YAAY,CACP,GAA0B,EAC1B,IAA6B,EAC7B,IAAgC,EAChC,SAA6B,EAC7B,SAA6B,EAC7B,UAAmB;IAGpB,IAAI,GAAG,CAAC,GAAG,KAAK,OAAO,EAAE;QACrB,yBAAyB;QACzB,GAAG,CAAC,cAAc,EAAE,CAAC;QACrB,gBAAgB;QAChB,IAAI,QAAQ,GAAa,IAAI,CAAC,KAAK,CAAC;QACpC,IAAI,OAAO,GAAc,QAAQ,CAAC,IAAI,EAAE,CAAC;QACzC,IAAI,QAAQ,GAAa,OAAO,CAAC,MAAM,GAAG,CAAC,CAAC;QAC5C,2BAA2B;QAC3B,IAAI,QAAQ,EAAE;YACV,cAAc;YACd,IAAI,CAAC,KAAK,GAAG,EAAE,CAAC;YAEhB,gBAAgB;YAChB,IAAI,CAAC,KAAK,IAAI,IAAI,GAAG,OAAO,GAAG,IAAI,CAAC;YACpC,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;YAEpB,2BAA2B;YAC3B,IAAI,MAAM,GAAY,MAAM,WAAW,CAAC,OAAO,CAAC,CAAC;YAEjD,IAAI,MAAM,CAAC,EAAE;gBACT,IAAI,CAAC,KAAK,IAAI,MAAM,CAAC,MAAM,CAAC;;gBAE5B,IAAI,CAAC,KAAK,IAAI,MAAM,CAAC,KAAK,CAAC;YAC/B,IAAI,CAAC,KAAK,IAAI,IAAI,CAAC;YAEnB,cAAc;YACd,OAAO,CAAC,WAAW,CAAC,SAAS,EAAE,IAAI,EAAE,UAAU,CAAC,CAAC;YACjD,OAAO,CAAC,qBAAqB,CAAC,SAAS,EAAE,IAAI,CAAC,CAAC;SAClD;KACJ;AACL,CAAC;AAaD,SACA,MAAM,CACD,SAAmB,EACnB,QAAkB;IAGnB,IAAG,CAAC,SAAS;QACT,MAAM,IAAI,KAAK,CAAC,QAAQ,CAAC,CAAC;AAClC,CAAC;AAGD,KAAK,UACL,WAAW,CACN,SAAkB;IAGnB,IAAI,YAAY,GAAG,EAAC,KAAK,EAAE,SAAS,EAAC,CAAC;IACtC,IAAI,YAAY,GAAG,IAAI,CAAC,SAAS,CAAC,YAAY,CAAC,CAAC;IAEhD,IAAI,WAAW,GAAI,EAAC,MAAM,EAAG,MAAM;QACf,OAAO,EAAE,EAAC,cAAc,EAAE,kBAAkB,EAAC;QAC7C,IAAI,EAAK,YAAY,EAAC,CAAC;IAE3C,mEAAmE;IACnE,4CAA4C;IAC5C,IAAI,MAAM,GAAW,EAAC,EAAE,EAAM,KAAK;QACb,KAAK,EAAG,kCAAkC,EAAC,CAAC;IAElE,IAAI;QACA,IAAI,QAAQ,GAAc,MAAM,KAAK,CAAC,QAAQ,EAAE,WAAW,CAAC,CAAC;QAC7D,IAAI,QAAQ,CAAC,EAAE;YACX,MAAM,GAAG,MAAM,QAAQ,CAAC,IAAI,EAAY,CAAC;aACxC;YACD,OAAO,CAAC,GAAG,CAAC,oBAAoB,EAAE,QAAQ,CAAC,CAAC;YAC5C,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,mBAAmB,EAAC,CAAC;SACpD;KACJ;IACD,OAAO,CAAM,EAAE;QACX,OAAO,CAAC,GAAG,CAAC,gBAAgB,EAAE,CAAC,CAAC,CAAC;QACjC,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,eAAe,EAAC,CAAC;KAChD;IAED,OAAO,MAAM,CAAC;AAClB,CAAC"}
\ No newline at end of file
+{"version":3,"file":"wfc.js","sourceRoot":"","sources":["../ts/wfc.ts"],"names":[],"mappings":"AAAA;;;;GAIG;AAEH,OAAO,KAAK,OAAO,MAAM,cAAc,CAAA;AAEvC,oEAAoE;AACpE,qBAAqB;AACrB,oEAAoE;AAEpE,IAAI,EAAE,CAAC;AAEP,SACA,IAAI;IAIA,IAAI,IAAI,GAAoC,QAAQ,CAAC,cAAc,CAAC,WAAW,CAA8B,CAAK;IAClH,IAAI,IAAI,GAAoC,QAAQ,CAAC,cAAc,CAAC,YAAY,CAAgC,CAAE;IAClH,IAAI,SAAS,GAA+B,QAAQ,CAAC,cAAc,CAAC,oBAAoB,CAAqB,CAAK;IAClH,IAAI,SAAS,GAA+B,QAAQ,CAAC,cAAc,CAAC,aAAa,CAA4B,CAAK;IAClH,IAAI,eAAe,GAAyB,GAAG,CAAC;IAGhD,IAAI,CAAC,gBAAgB,CAAC,SAAS,EAC3B,UAAS,CAAgB;QACrB,YAAY,CAAC,CAAC,EAAE,IAAI,EAAE,IAAI,EAAE,SAAS,EAAE,SAAS,EAAE,eAAe,CAAC,CAAC;IACvE,CAAC,CACJ,CAAC;AACN,CAAC;AAGD,yBAAyB;AACzB,KAAK,UACL,YAAY,CACP,GAA0B,EAC1B,IAA6B,EAC7B,IAAgC,EAChC,SAA6B,EAC7B,SAA6B,EAC7B,UAAmB;IAGpB,IAAI,GAAG,CAAC,GAAG,KAAK,OAAO,EAAE,CAAC;QACtB,yBAAyB;QACzB,GAAG,CAAC,cAAc,EAAE,CAAC;QACrB,gBAAgB;QAChB,IAAI,QAAQ,GAAa,IAAI,CAAC,KAAK,CAAC;QACpC,IAAI,OAAO,GAAc,QAAQ,CAAC,IAAI,EAAE,CAAC;QACzC,IAAI,QAAQ,GAAa,OAAO,CAAC,MAAM,GAAG,CAAC,CAAC;QAC5C,2BAA2B;QAC3B,IAAI,QAAQ,EAAE,CAAC;YACX,cAAc;YACd,IAAI,CAAC,KAAK,GAAG,EAAE,CAAC;YAEhB,gBAAgB;YAChB,IAAI,CAAC,KAAK,IAAI,IAAI,GAAG,OAAO,GAAG,IAAI,CAAC;YACpC,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;YAEpB,2BAA2B;YAC3B,IAAI,MAAM,GAAY,MAAM,WAAW,CAAC,OAAO,CAAC,CAAC;YAEjD,IAAI,MAAM,CAAC,EAAE;gBACT,IAAI,CAAC,KAAK,IAAI,MAAM,CAAC,MAAM,CAAC;;gBAE5B,IAAI,CAAC,KAAK,IAAI,MAAM,CAAC,KAAK,CAAC;YAC/B,IAAI,CAAC,KAAK,IAAI,IAAI,CAAC;YAEnB,cAAc;YACd,OAAO,CAAC,WAAW,CAAC,SAAS,EAAE,IAAI,EAAE,UAAU,CAAC,CAAC;YACjD,OAAO,CAAC,qBAAqB,CAAC,SAAS,EAAE,IAAI,CAAC,CAAC;QACnD,CAAC;IACL,CAAC;AACL,CAAC;AAaD,SACA,MAAM,CACD,SAAmB,EACnB,QAAkB;IAGnB,IAAG,CAAC,SAAS;QACT,MAAM,IAAI,KAAK,CAAC,QAAQ,CAAC,CAAC;AAClC,CAAC;AAGD,KAAK,UACL,WAAW,CACN,SAAkB;IAGnB,IAAI,YAAY,GAAG,EAAC,KAAK,EAAE,SAAS,EAAC,CAAC;IACtC,IAAI,YAAY,GAAG,IAAI,CAAC,SAAS,CAAC,YAAY,CAAC,CAAC;IAEhD,IAAI,WAAW,GAAI,EAAC,MAAM,EAAG,MAAM;QACf,OAAO,EAAE,EAAC,cAAc,EAAE,kBAAkB,EAAC;QAC7C,IAAI,EAAK,YAAY,EAAC,CAAC;IAE3C,mEAAmE;IACnE,4CAA4C;IAC5C,IAAI,MAAM,GAAW,EAAC,EAAE,EAAM,KAAK;QACb,KAAK,EAAG,kCAAkC,EAAC,CAAC;IAElE,IAAI,CAAC;QACD,IAAI,QAAQ,GAAc,MAAM,KAAK,CAAC,QAAQ,EAAE,WAAW,CAAC,CAAC;QAC7D,IAAI,QAAQ,CAAC,EAAE;YACX,MAAM,GAAG,MAAM,QAAQ,CAAC,IAAI,EAAY,CAAC;aACxC,CAAC;YACF,OAAO,CAAC,GAAG,CAAC,oBAAoB,EAAE,QAAQ,CAAC,CAAC;YAC5C,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,mBAAmB,EAAC,CAAC;QACrD,CAAC;IACL,CAAC;IACD,OAAO,CAAM,EAAE,CAAC;QACZ,OAAO,CAAC,GAAG,CAAC,gBAAgB,EAAE,CAAC,CAAC,CAAC;QACjC,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,eAAe,EAAC,CAAC;IACjD,CAAC;IAED,OAAO,MAAM,CAAC;AAClB,CAAC"}
\ No newline at end of file
diff --git a/priv/static/js/ts/grids-basic.ts b/priv/static/js/ts/grids-basic.ts
index a81526f..bf52b8c 100644
--- a/priv/static/js/ts/grids-basic.ts
+++ b/priv/static/js/ts/grids-basic.ts
@@ -27,6 +27,11 @@ main
     let grids_url_elt = document.getElementById('grids-url') as HTMLTextAreaElement;
     let grids_png_elt = document.getElementById('grids-png') as HTMLImageElement;
 
+    let rand_data : Uint8Array = new Uint8Array(32);
+    window.crypto.getRandomValues(rand_data);
+    let hex : string = rand_data.toHex().toUpperCase();
+    p_input.value = 'text payload ' + hex;
+
     // Page initialization
     submit_btn.addEventListener(
         'click',