Knowledge Base

Skycoin (The Coin)


Skycoin was created as an answer to the shortcomings of both Bitcoin and Ethereum. Born out of necessity, no other coin was fulfilling Satoshi’s original vision of a fully decentralized digital currency.

Skycoin’s platform is free from centralization and manipulation through its revolutionary Obelisk consensus algorithm. It features CX, a turing complete programming language built from the ground up to allow hundreds of thousands of devs to easily deploy applications to the blockchain. Skycoin functions as a currency with virtually-free transactions, soon-to-be-implemented absolute privacy, and Visa-like speeds with inherent asset-backed value not based on speculation.

Holding Skycoin generates Coin Hours which are used to purchase services on the Skywire network and can be exchanged for more Skycoin.


Skycoin’s suite of decentralized applications.

Skywire Chat

Skywire Chat is the instant messenger of Skywire (not to be confused with the messaging system over which it runs) that connects Skywire nodes. Skywire Chat is one of the apps that each Skywire node has installed and running by default.


SSH (often called „therealssh“) is the remote command executer in Skywire. It is one of the apps that each Skywire node has installed and running by default.

Telegram Groups

The Skycoin community is most active on the messaging app Telegram.


Official Groups

As of Feb 2019

News Channel:
BBS Community:
CX Skycoin Game Development:
Kitty Cash:
Price Discussion:
Skycoin Development:
Sky Fiber:

Official Regional Groups

As of Feb 2019


Join @MeetupsWorldwideSkycoin for presentation resources & ideas on how to start a local group of your own.


Unofficial Groups

Groups are only added to this list as group owners volunteer them. Contact to add your group.

The Skycoin Platform


[this section needs to be a full overview of how the Skycoin platform interconnects and operates as a whole]


A transport is a connection between two Skywire Nodes. There are different types of transports such as messaging transports (established over the messaging system), Skywire transport (direct connection between two nodes not using TCP/IP). Transports handle the reliability of the data transfer and encryption.

Unspent Transaction Output

Skycoin Docs

Wikipedia Entry

Unspent transaction output

In cryptocurrencies, an unspent transaction output (UTXO) is an abstraction of Electronic Money. Each UTXO represents a chain of ownership implemented as a chain of Digital Signatures where the owner signs a message (transaction) transferring ownership of his UTXO to the receiver's Public Key.

The total UTXOs present in a blockchain represent a set , every transaction thus consumes elements from this set and creates new ones that are added to the set. The set thus represents all the coins in the system.

An UTXO defines an output of a blockchain transaction that has not been spent, i.e. used as an input in a new transaction. Bitcoin is the most famous example of a cryptocurrency that uses the UTXO model.[1][2][3]

Outputs are a superset of UTXOs.[1] Accordingly, UTXOs are a subset of the outputs superset. Bitcoin UTXO lifespans have been studied.[4]

In the case of a valid blockchain transaction, unspent outputs (and only unspent outputs) may be used to effect further transactions. The requirement that only unspent outputs may be used in further transactions is necessary to prevent double spending and fraud.

For this reason, inputs on a blockchain are deleted when a transaction occurs, whilst at the same time, outputs are created in the form of UTXOs. These unspent transaction outputs may be used (by the holders of private keys; for example, persons with cryptocurrency wallets) for the purpose of future transactions.

See also


Further reading