diff --git a/.gitattributes b/.gitattributes
index 5d7abd8..e4062a2 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -2,6 +2,7 @@
 *.mbox filter=git-crypt diff=git-crypt
 *.sec* filter=git-crypt diff=git-crypt
 *.key* filter=git-crypt diff=git-crypt
+#config.yml filter=git-crypt diff=git-crypt
 secrets/** filter=git-crypt diff=git-crypt
 *.asc !filter !diff
 .gitattributes !filter !diff
diff --git a/_data/timelog.yml b/_data/timelog.yml
index de5174b..d6025fc 100644
--- a/_data/timelog.yml
+++ b/_data/timelog.yml
@@ -11,3 +11,5 @@
 1624117500619195903: stop toptal -- /drg/toychain
 1624171149798092491: start toptal -- /drg/toychain
 1624219990488746675: stop toptal -- /drg/toychain
+1624361700774728980: start toptal pow -- /drg/toychain
+1624395286300684038: stop toptal -- /drg/toychain
diff --git a/config.yml b/config.yml
index 22ea0bd..5842fe5 100644
--- a/config.yml
+++ b/config.yml
@@ -1,10 +1,15 @@
 --- # toychain's config
+version: 1.01
+chain: toychain
+# p2p network = api+1
 apis:
     - 127.0.0.1:8091
     - 127.0.0.2:8093
     - 127.0.0.3:8095
     - 127.0.0.4:8097
     - 127.0.0.5:8099
-# network = api+1
-difficulty: 2
-reward: 100
+
+# block parameters :
+bkver: 0
+difficulty: 5
+bkreward: 100
diff --git a/genesis.yml b/genesis.yml
index 24d41ca..62f4751 100644
--- a/genesis.yml
+++ b/genesis.yml
@@ -2,14 +2,14 @@
 ver: 0
 data:
  seq: 0
- payload: QmWM48KvyK9YyPjJt69erxVPN3nbXVMgZWrncRJhAVkGAv
+ payload: /ipfs/QmWM48KvyK9YyPjJt69erxVPN3nbXVMgZWrncRJhAVkGAv
  comment: "This is the genesis block"
 meta:
  seed: 0xb3560762
- salt: 442360558803467359 # used in address computation
+ salt: 442360558864191384 # used in address computation
  txroot: ~
 audit:
  peerid: QmcfHufAK9ErQ9ZKJF7YX68KntYYBJngkGDoVKcZEJyRve
  tics: 1623830817245864895
  ip: 83.78.4.228
-prev: ZgjNT5GbSC81KmUPncwhzQAGV3GUeAXafmkMPBw2GMHWM
+prev: ZdtrjkYsAYUeBCs4DRjtVYwPevpxvHjGT2PRauANr3Vao
diff --git a/lib b/lib
index 9d739e5..0d8920d 160000
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 9d739e5c4bb0b27babea7bdc441cfed6a85bb694
+Subproject commit 0d8920d1f5b431c583a1a23d230b8ad0b0675c5d
diff --git a/notes.md b/notes.md
index 2e81f48..ad0b987 100644
--- a/notes.md
+++ b/notes.md
@@ -27,8 +27,23 @@
 
 -  PoW is to slow down chainupdate to avois spam
 -  consensus is on the longest length
--  /!\ maximal work is hackable 
+-  /!\ maximal work is hackable (as pow is exponential to difficulties)
  
 -  sort of tx sequence can be done on node side
 -  block chain can store tx out of order (FIFO style)
 
+-  does mining really need to be conpetitive ?
+-  if mining is done by all node the recipient of txo will be willing to mine!
+-  if a .2% tax on transaction can replace/solve all VAT taxes
+   then mining rewards is "artificially" inflated to compensate for a wasteful
+   technology
+
+-  nano-trading is stealing (i.e. taking advantage of who has the power to be informed fast)
+   on need to put a "lowpass" filter on trading :
+   speculation is necessary for long term protection against future uncertainty...
+   short term predicition make no sense !
+
+   long unpredictable queue time (mempools) can deter speculator as it would be like "lotery"
+   lotery is a "gamified" tax extractor.
+
+
diff --git a/secrets/keys.yml b/secrets/keys.yml
new file mode 100644
index 0000000..45c5918
Binary files /dev/null and b/secrets/keys.yml differ
diff --git a/t/cashash.t b/t/cashash.t
new file mode 100644
index 0000000..072416d
--- /dev/null
+++ b/t/cashash.t
@@ -0,0 +1,31 @@
+
+BEGIN { if (-e $ENV{SITE}.'/lib') { use lib $ENV{SITE}.'/lib'; } }
+
+use seed qw(getsalt);
+
+seed::setseed(0x1245356);
+
+use encode qw(decode_base58f encode_base58f);
+use CAStore qw(cashash CASWrite);
+printf "v16: %s\n",unpack'H*',decode_base58f('TxG4cMYVXUM4T8GdwCyauYe4UkKYWnrkFsZVxe3KRfg');
+printf "v58: %s\n",encode_base58f(pack'H*','0d347435dc89c141487f8ec816d71bdc05341b52f40b53fb6bd8469885bcee57');
+printf "v58: %s\n",encode_base58f(pack'H*','0d34000000000000000000000000000000000000000000000000000000000000');
+printf "len: %d\n",length('TxG4cMYVXUM4T8GdwCyauYe4UkKYWnrkFsZVxe3KRfg');
+my $type = 'Txi';
+my $salt = &getsalt();
+printf "type: %s\n",$type;
+my ($addr,$pow) = cashash('SHA256','~',$salt,$type,5);
+printf "addr16: f%s\n",unpack'H*',$addr;
+printf "addr58: %s\n",encode_base58f($addr);
+
+   $addr = CASWrite(undef,$salt,$type,5);
+printf "addr: %s\n",$addr;
+
+
+
+
+
+exit $?;
+
+1;
+
diff --git a/t/encode.t b/t/encode.t
index 7b105c3..cc1eb76 100644
--- a/t/encode.t
+++ b/t/encode.t
@@ -6,11 +6,12 @@ my @msg = (
     'no work yet !',
     'genesis nonce',
     'default nonce for block address',
+    'CAStore nonce',
     'initial nonce'
 );
 for my $msg (@msg) {
 print "msg: $msg\n";
-my $nonce = unpack 'Q',&decode_basen($msg,29);
+my $nonce = unpack 'Q',&decode_basen(lc($msg),29);
 printf "nonce: %s\n",$nonce;
 printf "nonce16: %s\n",unpack'H*',pack('Q',$nonce);
 printf "monce29: %s\n",&encode_basen(pack('Q',$nonce),29);
diff --git a/testing.pl b/testing.pl
index 8ab351c..376bd55 100644
--- a/testing.pl
+++ b/testing.pl
@@ -13,7 +13,7 @@ BEGIN { print "// ToyChain !\n"; }
 
 use lib 'lib';
 use seed qw(rand64);
-use misc qw(khash $ZNull);
+use misc qw(khash $Zempty);
 use toychain;
 use encode qw(mbase58);
 
@@ -30,6 +30,7 @@ printf "genesis: %s\n",$headhash;
 print "// testing getTxMeta\n";
 my $txblock = getTxMeta();
 
+
 print "// testing blockCreation\n";
 # createBlock(seed,payload,txblock,comment)
 my $block = &createBlock($seed,"This is the 2nd block payload",$txblock,'1st comment for new block');
@@ -37,11 +38,13 @@ displayBlock($block);
 print "// testing insertBlock:\n";
 my $chain = &insertBlock($toychain::HEADs[0],$block);
 
+createDot($toychain::chain);
+
 displayChain($toychain::chain);
 
 
 
-#$head = newBlock(1,'this is a playload',$ZNull,$head,$salt);
+#$head = newBlock(1,'this is a playload',$Zempty,$head,$salt);
 #printf "head: %s\n",mbase58($head);
 
 exit $?;