diff --git a/docu/Concepts/Snippets/1-Blockchain/Roles.md b/docu/Concepts/Snippets/1-Blockchain/Roles.md
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+# Roles
+User Roles also handled by blockchain and node servers
+
+My Goal is to save not only the gradido transactions in blockchain but also 
+who is allowed to create new gradidos,
+who allow joining new user to the group,
+who allow connect to another group and 
+how the community decide which one is allowed to do this things.
+
+## Why?
+If this would be handled only by community-server everyone could be easly 
+overwrite this rules by using a modified client to send his transactions direct over
+hedera or iota bypassing the community-server rules. 
+With hedera it is possible to only allow sending messages to a topic with the correct admin key,
+but then is the admin the single point of failure. Also must the key saved on server to allow everyone 
+sending gradidos or the transactions will only be proccessed, when admin is logging in.
+If we don't use blockchain technologie at all, we have a big single point of failure. 
+The Community-Server and everyone who has direct access to server and the admins of course.
+But it would be much much simpler of course :)
+
+In summary it is to make sure that the community is in power and no one can take over.
+
+## How?
+There is a special type of transactions with which users determine who can determine what.
+This transaction control which signatures are neccessary for things like creation and so one.
+For this I think different types are needed.
+- *one*: The founder of group (or someone other choosen) decide everything, this is default from start
+- *some*: a number of user must sign, set absolute count or relative count
+- *most*: more than 1/2 or 3/4 must sign
+- *all*: all member must sign, default for choose which mode will be used 
+- *one-council*: one member of council
+- *some-council*: absolute or relative number of council members must sign
+- *most-council*: more than 1/2 or 3/4 from council members must sign
+- *all-council*: all members of council must sign
+
+this configuration can be done for different types of action,
+so the voting-mode for creation may differ from voting mode for
+add new members to community. Also the council members for different actions
+may differ.
+Also how to vote for council members is an extra type of action.
+
+## Veto
+Especially for *some* and *some-council* maybe also for other types.
+The users there could vote but haven't yet and not all need to vote,
+can make a Veto with Explanation which reset all existing signs of current vote,
+and is needed to sign by all which again vote for the case.
+
+## Summary
+With that setup all community consense models should be possible except Democracy.
+Democracy needs a secret ballot. The votes on blockchain are open (at least if someone knows which 
+public-key belongs to which user). A secret ballot on blockchain is really hard. By my last
+recherche I haven't found on. But maybe this can do the trick: https://secure.vote/
+
diff --git a/docu/Concepts/Snippets/Iota/ColoredCoins.md b/docu/Concepts/Snippets/Iota/ColoredCoins.md
new file mode 100644
index 000000000..33d3a891e
--- /dev/null
+++ b/docu/Concepts/Snippets/Iota/ColoredCoins.md
@@ -0,0 +1,42 @@
+# Wie Colored Coins in Iota funktionieren
+## Schöpfung
+- Colored Coins werden bei Iota mit einer speziellen Transaktion erzeugt
+- Die Farbe des neuen Coins wird durch den Transaktionshash beschrieben
+- Die einmal erzeugte Menge von Colored Coins ist fest
+- Um die Menge zu erhöhen müssten neue Colored Coin erzeugt werden und die alten damit ausgetauscht werden (z.B. mittels SmartContract)
+
+## Geldmenge
+- Colored Coins basierend auf den normalen Iota-Coins somit werden soviele Iota-Coins benötigt wie man Colored-Coins braucht
+- 2.779.530.283.000.000 Iota maximale Coinmenge
+- Weltbevölkerung 2021: 7.915.559.780
+- Pro Kopf Geldmenge Gradido: 53.476
+- Benötigte Iota Coins für Gradido mit 4 Nachkommastellen mit 25% Puffer: 
+- 7.915.559.780 * 534.760.000 * 1.25 = 5.291.155.935.000.000.000
+- Vorhandene Iota coins:                   2.779.530.283.000.000
+- Es sind nicht genügend Iota Coins vorhanden im die ganze Welt mit Gradido auf Basis von Iota versorgen zu können
+
+## Kosten 
+- Kurs am 30.08.2021: 1 Miota = 0,84
+- Bei Verwendung von 4 Nachkommastellen braucht es 10 Miota für 1.000 Colored Coins (Gradido) also Miota im Wert von 8,40€
+- Aktuell (30.08.2021) geschöpfte Gradido Cent: 17.001.990.500
+- Notwendige Miota: 17.002.0, Wert: 14.286,73 €
+- Solange die Benutzer Kontrolle über ihre Keys haben können sie mit einem regulärem Iota Wallet die Gradidos wieder in Iota umwandeln (um z.B. der Vergänglichkeit zu entgehen)
+- Mit 2 Nachkommastellen wird die Vergänglichkeit schon bei 100 Gradido und 1 Stunde ungenau 
+- 1 Stunde,	100 Gradido, Vergänglichkeit: 0,00576, Gradidos nach einer Stunde: 99,99424 GDD
+- 1 Minute,	100 Gradido, Vergänglichkeit: 0,000096, Gradidos nach einer Minute:	99,999904 GDD
+
+## Dust-Protection
+- Iota erlaubt bei leeren Adressen nur Transaktionen von mindestens 1 Miota
+- Nachdem 1 Miota da ist sind bis zu 10 Transaktione < 1 Miota erlaubt, bevor ein weitere Transaktion mit mindestens 1 Miota eingehen muss
+- Bei Verwendung von 4 Nachkommastellen entspricht das 100 GDD, bei 2 Nachkommastellen 10.000 GDD
+
+## Lösung
+Wir können nur 3 Nachkommastellen verwenden. 
+### Kosten
+- 0,84 € für 1.000 GDD
+- 1.428 Euro für alle bisherigen geschöpften Gradidos
+### Dust-Protection
+- 1.000 GDD entspricht 1 Miota, die erste Schöpfung muss also zwangsläufig 1k Gradido betragen
+- Jeder kann nur maximal 10 Transaktionen < 1k GDD empfangen bevor er die GDD weitergesendet haben muss um neue erhalten zu können oder eine neue Schöpfung von 1k GDD bekommen hat
+
+
diff --git a/docu/Concepts/Snippets/images/classes.drawio b/docu/Concepts/Snippets/images/classes.drawio
new file mode 100644
index 000000000..ad4f88aa2
--- /dev/null
+++ b/docu/Concepts/Snippets/images/classes.drawio
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/docu/Concepts/Snippets/images/classes.png b/docu/Concepts/Snippets/images/classes.png
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diff --git a/docu/Concepts/Snippets/images/example_blockchain.drawio b/docu/Concepts/Snippets/images/example_blockchain.drawio
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index 000000000..ac043b21b
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@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/docu/Concepts/Snippets/images/example_blockchain.png b/docu/Concepts/Snippets/images/example_blockchain.png
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diff --git a/docu/Concepts/Snippets/images/iota.drawio b/docu/Concepts/Snippets/images/iota.drawio
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