diff --git a/bin/toychain b/bin/toychain
new file mode 100755
index 0000000..130360d
--- /dev/null
+++ b/bin/toychain
@@ -0,0 +1,112 @@
+#!/bin/sh
+
+pgm="${0##*/}"
+what="${1:-usage}"
+# vim: syntax=sh
+#
+echo "--- # $pgm"
+
+if [ "x$what" = 'xusage' ]; then
+cat <<EOT
+# welcome to toychain a simple educational blockchain
+
+available commands:
+
+$pgm init   \$name            # to initialize \$name node
+$pgm config \$name            # to change configuration to this \$name node
+$pgm start  \$name            # to start a local \$name node
+$pgm stop   \$name            # to stop a \$name node
+$pgm restart \$name           # to restart a \$name node
+$pgm sync \$name              # to synchronize a \$name node
+$pgm update \$tag             # to synchronize a \$tag node
+$pgm test \$tc                # to run the \$tc test case
+$pgm debug \$cmd              # to running \$cmd in debug mode
+
+EOT
+
+fi
+
+
+main() {
+case $what in
+ init) tcinitialize $2;;
+ config) tcconfigure $@;;
+ start) tcstart $2;;
+ stop) tcstop $2;;
+ stop) tcstop $2;;
+ update) tcupdate $@;;
+ test) tctest $@;;
+ debug) tcdebug $@;;
+ support) echo "do you need help with $pgm ?\n- call our support line at https://www.drit.ml\n-- Dr I·T";;
+ log) tclog;;
+ *) tcrun $@;;
+esac
+
+}
+
+
+
+tcinitialize() {
+ echo "$pgm: initializing ..."
+ echo "---"
+}
+
+tcconfigure() {
+ echo "$pgm: configure ..."
+ echo "---"
+}
+
+tcstart() {
+ echo "$pgm: starting daemon ..."
+ echo "---"
+}
+
+tcstop() {
+ echo "$pgm: stopping daemon ..."
+ echo "---"
+}
+
+tcsync() {
+ echo "$pgm: synchronizing daemon ..."
+ echo "---"
+}
+
+tcupdate() {
+ shift;
+ tag=$2
+ echo "$pgm: updating daemon with tag $tag..."
+ git pull origin master # 1> transcript.log 2>&1
+ git checkout $tag # 1> transcript.log 2>&1
+ echo "---"
+}
+
+tclog() {
+ echo "$pgm: transcript log"
+ tail -f transctip.log
+ echo "---"
+}
+
+tctest() {
+ tc="$2"
+ echo "$pgm: running $1 $tc"
+ echo "---"
+}
+
+tcrun() {
+ cmd="$@"
+ echo "$pgm: running $cmd"
+ $cmd
+ echo "..."
+}
+
+tcdebug() {
+ shift;
+ cmd="$@"
+ echo "$pgm: running $cmd in debug mode..."
+ echo "---"
+}
+
+
+main $@;
+exit $?;
+true; # $Source: /my/shell/scripts/toychain.sh $
diff --git a/config.yml b/config.yml
index 5842fe5..4b0f997 100644
--- a/config.yml
+++ b/config.yml
@@ -1,6 +1,9 @@
 --- # toychain's config
 version: 1.01
 chain: toychain
+apiver: '0.0'
+port: 8089
+
 # p2p network = api+1
 apis:
     - 127.0.0.1:8091
@@ -11,5 +14,9 @@ apis:
 
 # block parameters :
 bkver: 0
-difficulty: 5
 bkreward: 100
+# Proof of Work option
+difficulty: 5
+maxdiff: 7
+# CAstore options
+trackmode: 1
diff --git a/genesis.yml b/genesis.yml
index 62f4751..754a9de 100644
--- a/genesis.yml
+++ b/genesis.yml
@@ -6,7 +6,7 @@ data:
  comment: "This is the genesis block"
 meta:
  seed: 0xb3560762
- salt: 442360558864191384 # used in address computation
+ salt: ~ # used in address computation
  txroot: ~
 audit:
  peerid: QmcfHufAK9ErQ9ZKJF7YX68KntYYBJngkGDoVKcZEJyRve
diff --git a/secrets/keys.yml b/secrets/keys.yml
index 45c5918..7047ffe 100644
Binary files a/secrets/keys.yml and b/secrets/keys.yml differ