Here you will find our fee schedule and a list of guides to help you use the Nexus Wallet for purposes such as registering Assets (NFTs), creating Tokens and Namespaces. If you have any further questions please join one of the Nexus Community Channels found in the footer, and post a message asking for help.


Nexus aims to offer fee-free transactions for the majority of transactions that users make. It is free to send NXS/tokens (OP::DEBIT), and in most cases it is free to receive them (OP::CREDIT). Similarly it is free to transfer an asset or other register (OP::TRANSFER) and in most cases it is free to receive ownership (OP::CLAIM).

To maintain security of the network, a transaction fee is applied, regardless of the types of contracts and operations within it, if the user makes more than one transaction in a 10-second period.

The breakdown of fees for all operation types is as follows:

Action Cost Note

Sending NXS or other tokens


Receiving NXS or other tokens


If the debit being credited has contract conditions, a fee may apply for executing those conditions depending on their complexity. A fee-free threshold for conditions means that simple contract conditions such as adding an expiry to a debit will mean crediting them will be free

Transferring assets (NFTs) and other registers


Claiming ownership of assets or other registers


If the register being claimed is a named register, i.e. there exists a local name for it in the previous owners signature chain, then a corresponding local name is created for it when claiming. This name creation attracts a 1 NXS fee.

If the transfer being claimed has contract conditions, a fee may apply for executing those conditions depending on their complexity. A fee-free threshold for conditions means that simple contract conditions such as adding an expiry to a transfer will mean claiming them will be free

Creating a NXS or token account


If the account is given a name, there is a 1 NXS fee applied for the creation of the name register.

Creating an asset or other register


The fee is calculated based on the size of data stored in the register at 0.001 NXS per byte. However there is a minimum fee of 1 NXS and (at the time of writing) a maximum register size of 1Kb, meaning the fee will vary between 1 an 1.024 NXS.

Updating an asset or other register


Creating a local name


Creating a global name


Creating a namespace


Creating a token


The fee calculation for creating a token is based on the number of total supply of token divisible units, which in turn is calculated from the token supply and the number of decimals in the token definition. For example, a token with supply 1,000,000 and 2 decimals has a total of 100,000,000 divisible units. The actual fee calculation is a logarithmic scale based on this number, using the formula:

Fee = (log10(divisible units) – 2) * 100

A minimum fee of 1 NXS always applies. This yields the following fees based on number of divisible units

100 = 1 NXS
1,000 = 100 NXS
100,000 = 300 NXS
1,000,000 = 400 NXS
1,000,000,000 = 700 NXS
1,000,000,000,000 = 1000 NXS

Transaction Fee

0-1 NXS

A transaction fee is applied whenever a transaction is created within 10 seconds of the last transaction within a signature chain. The fee is calculated based on the number of contracts within the transaction at a rate of 0.01 NXS per contract, of which there can be a maximum of 100 (at the time of writing). Therefore the transaction fee will be between 0 and 1 NXS.

The transaction fee is applied in addition to any of the other fees described in this table.

What is an Asset (NFT)?

Assets are non-fungible tokens (NFTs), meaning they are non-divisible. In its simplest form, an Asset is nothing more than arbitrary data stored on the Nexus blockchain in a state register. You as the user can decide what data is stored in that Asset, and depending on the way the Asset is created, whether or not the data in the Asset can ever be changed (is mutable / immutable). Think of it like writing on a piece of paper. You can choose to write what you want on that piece of paper. If you write it in ink then it is permanent. If you write some of it in pencil, then you can erase it and change it to something else.

What is a State Register?

The Nexus architecture uses state registers for storing many different types of data including Accounts, Tokens, Names, and Assets. A state register sounds fancy, but it is really just a space where information can be stored.

With the Nexus API, you can make special kinds of transactions to create these registers or update / append to the data in them. When the data in a register changes, it is said that the register is 'changing state' from what it was previously to what you are now changing it to - hence the name state register.

Every register on the Nexus blockchain has two main properties: An address (referred to as a register address) which is used to determine the location of the data in the register database, and an owner, which is the genesis hash of the Signature Chain that currently owns the register.

What can Assets be used for?

Allowing users to store arbitrary data in a blockchain is not a new concept - we've been able to do that since the early days of Bitcoin. What's unique about Nexus' register-based blockchain is that all changes to a register - including changes to the data and to the ownership of it - are captured in the transactions recorded on the blockchain. Not only does this allow us to validate data changes via consensus rules, but it also allows us to view the entire history of changes to the data in a register and its ownership.

It becomes an audit log for data, allowing users to see what that data looked like and who owned it at any point in time. That's a hugely powerful concept and opens the door to many use cases where a history of the data is required, e.g. supply chains, postal tracking, land/real estate deeds, certificates of authenticity, art watermarking, wills, etc. Each Asset is owned by a Signature Chain, which is great for situations where there is one single owner of an Asset.

However, what about those use cases where partial ownership is required, for example where a piece of real estate is owned by two or more investors and they want to prove their ownership via a public blockchain? Nexus solves this by allowing an Asset to be tokenized, which means that the ownership of an Asset is transferred to a token rather than a Signature Chain. Once tokenized, any users that hold the tokens in their Signature Chain become partial owners of the Asset, much like owning shares in a company.

Furthermore, tokenized Assets provide the ability for shared revenue to be automatically distributed in the form of NXS payments to the partial owners of the Asset, based on the percentage of tokens held. This is useful for use cases such as the automatic payment of dividends for Security Token Offerings (STO's), and for the distribution of royalties from revenue earned from an Asset such as a music album.

How do I create an Asset?

The Nexus API provides a straightforward and intuitive interface for users to create, update, and transfer Assets. To create a basic Asset you can use the Wallet console or Nexus command line interface (CLI) and issue a simple command:

assets/create/asset name=myfirstasset data=this_is_some_data

The create/asset API method allows the Asset to be defined in several different formats. Shown above is the basic format, which is the default. In the basic format the data is supplied in key=value pairs, all data is treated internally as a string (a series of alphanumeric characters), and all data is immutable (cannot be changed). The create/asset API alternatively allows complex Assets to be defined using JSON format.

The following example shows how an Asset might be used to store the title deeds to a property:


address=1640 Riversdale Drive, CA

What does it cost to create an Asset?

The fee charged for creating Assets depends on the amount of data you are storing. The charge is 0.01 NXS ber byte, with a minimum fee of 1 NXS. This means that the cost of an Asset will be between 1 and 10 NXS depending on how much data it contains.

How much data can I store in an Asset?

Currently all registers are limited to a maximum of 1Kb, which is about 1000 characters of text.

How do I transfer an Asset?

You can transfer ownership of an Asset to another Signature Chain with a simple API command specifying the name/address of the Asset you own, and the username/genesis of the recipient:

assets/transfer/asset name=myasset username=bob

How do I define which fields are editable?

In order to update data in an Asset, you have to initially create them using a JSON format, as opposed to the basic format shown above. Using the JSON format allows you to specify field type, length, mutability, and an initial value for each data field in the Asset.

What is a Token?

In the broader sense, tokens can be thought of as virtual currencies that exist on a blockchain.

What can Tokens be used for?

They can be used for a variety of uses such as:

  1. Representing ownership in an Asset:

    • a company
    • property / land title
    • rights to a book / album / film / piece of art
    • patents
  2. Utilities
  3. Loyalty programs
  4. Gaming tokens
  5. DAO voting rights

How does a Token created on the Nexus blockchain differ to tokens created on Ethereum, Waves, NEO, NEM, Stellar, etc?

The primary difference is simplicity. To create a token on Ethereum, or most other token platforms, users must write a smart contract - code written in a specific programming language - to define the token and how it will be used/distributed. This requires the user to have programming skills and the task can often be quite complicated. Nexus has taken a different approach by simplifying the process, allowing users to create a token in one short console command / API request. The wallet interface goes a step further providing a simple interface to guide users through the process.

Are there any limitations to this simplified approach?

The tradeoff for simplicity is flexibility. A token created from a traditional smart contract allows developers to define any rules they wish for the distribution and use of a token, which are encoded in the token definition contract. This flexibility is certainly useful, but is overly complex for people without programming skills.

Nexus decouples the contract rules from the token definition allowing the token creation to be far simpler, though provides further steps if more complex rules are needed. For those use cases that require more complex token utility, Nexus users can add contract rules as conditions to token debit transactions.

If the rules are too complex to be supported by a transaction condition, developers can write these rules into their application layer.

What properties does a token have?

When you first create a token you must specify the supply (the maximum number of whole tokens that will be available) and decimals (the number of decimal places that a token amount can have).

The combination of these two values gives the number of token divisible units that will be available (the equivalent of Bitcoin’s Satoshi’s property). For example a decimals value of 3 means that each token can be divided into 10^3 (1,000) parts. Therefore a token created with a supply of 1,000,000 and decimals of 3 would result in 1,000,000,000 (1,000,000 x 1,000) token divisible units. This is important, as this figure is what is used to calculate the fee applied when creating the token.

Once created, the token has three important properties:

  • maxsupply - the maximum number of tokens that will exist
  • currentsupply - the number of circulating tokens that have been distributed to token accounts
  • balance - the number of tokens that have not yet been distributed (maxsupply - currentsupply)

How do I create a token?

Tokens can easily be created through the Nexus Wallet or the console/CLI. The user defines a new token so that it can be distributed, traded, or used to tokenize an asset.

To create a new Token, go to the User module in the Wallet, and please follow the below instructions:

  1. Click on Tokens.
  2. Click Create new Token.
  3. Choose a Token Name.
  4. Choose the total number of Tokens to be created.
  5. Choose the amount of significant digits the Token will have.
  6. At the top of the box, the fee will be displayed in NXS for creating your supply of tokens.
  7. Click Create Token.
  8. Pay Fees.

To achieve the same using the console use the following command:

tokens/create/token name=My Token supply=100 decimals=2

How much does it cost to create?

The fee is based on the number of token divisible units you define (the combination of supply and decimals). There is a minimum fee of 1 NXS and the calculation is linear thereafter, so that each additional significant digit costs an additional 100 NXS. E.g.

100 units = 1 NXS

1000 units = 100 NXS

1000000 units = 400 NXS

10000000000 units = 800 NXS

How do I distribute my token?

Initially all of the token supply is held in the balance of the token. Distributing your token to other users is then very similar to how you send NXS. The first step is that the receiving users must create a new account for your token type and then provide you with the account name/address. Then you can use the wallet interface to send them just like you would send NXS, choosing the token from the Send From list. Alternatively, you can use the console with the following command:

tokens/debit/token name=My Token name_to=paul:tokenaccount amount=1000

Can I increase the supply once I have created my token?

At the time of writing, no the maximum supply cannot be changed once the token has been created. However, this ability is planned for a future release. How do I use a token to represent partial ownership of a digital or real-world asset?

One of the most significant use cases for tokens is the ability to tokenize an asset. Tokenized Assets provide the ability for shared revenue to be automatically distributed in the form of NXS payments to the partial owners of the Asset, based on the percentage of tokens held. This is useful for use cases such as the automatic payment of dividends for Security Token Offerings (STO’s), and for the distribution of royalties from revenue earned from an Asset such as a music album.

What Does Tokenizing An Asset (NFT) Mean?

Simply put, tokenizing an asset means to digitally represent the value and ownership credentials of a real world asset in a secure and easily transferable manner on the internet using blockchain technology. We refer to this digital representation of data as a token.

Nexus utilizes Signature Chains (SigChains) technology to simplify the creation of tokenized assets and validate ownership on the Nexus blockchain. Once created, a token (and all the value & rights associated with it) can be easily transferred from one SigChain to another (or in other words, from person to person). In other words, if we transfer ownership of an example real estate property to a token called, for instance, "Ownership_1020_Greengate_Dr_Columbia_SC_29229", and the amount of that token is 100, the token can serve as a percentage of ownership in the property. So, someone buying in 10% ownership in the property would receive, in exchange for their money, 10 of the ownership tokens. Alternatively, if someone purchased 50% ownership in a self portrait asset, they would receive half of the available tokens associated with the asset, which might be called "Ownership in Self Portrait".

Why Tokenize An Asset?

For the purposes of this article, there are two primary reasons for tokenizing an asset. First, it can store asset ownership permanently by the person who owns the tokens. For the self portrait asset, this percentage ownership can be made accessible via DApp created for the purpose of reporting high-value asset ownership. Second, it can automatically distribute revenue associated with the asset to the owners according to the allocated percentages. In the case of our fictitious real estate property, when the occupant pays the rent, 10% of the rent paid will be automatically transferred to the signature chain which owns 10% of the "Ownership..." token for this asset. This can be done with NXS (the cryptocurrency itself) or with a fungible token that the owners of the property agree to accept as rental proceeds, using the same mechanism used to send NXS or a token to any other address on the Nexus network.

Asset Examples

Briefly, an asset is a user-definable entity that is recorded on a SigChain. Examples of assets used for this article include a) a real estate property and b) a high-value work of art. On the blockchain, a real estate property asset might be represented with fields containing a tax identifier, a URL to a deed, and a hash used to verify the integrity of the deed file.

assets/create/asset name=1020_Greengate_Dr_Columbia_SC_29229

For the high-value work of art, one might represent the asset with fields containing the artist, creation date, a URL to a certificate of authenticity, and a hash to verify the integrity of that certificate file.

assets/create/asset name=Self Portrait artist=Neal Helman

Rest assured that the above examples are purely fictional. The assets and documents referenced do not exist. The API calls, however, exemplify how you might create an asset from the console in the Nexus wallet. This guide will also look at how one would use the wallet to do the same things demonstrated here with the console and API calls. It is anticipated that someone will create a DApp that will allow such assets to be created in a more industry-appropriate manner.

The following screenshot shows the location in the wallet to create an asset. On the User screen, in the Assets tab, click the Create new asset button to begin creating a new asset.

The next screenshot shows the fields filled in for the real estate asset. Note that none of the fields are numeric, so they are all string types, and none of them can be changed in the future meaning their mutable buttons are turned off. Upon scrolling to the bottom of this screen, one will see the button for submitting the fields and creating the asset. The user PIN for the SigChain is required in order to confirm the creation of the asset.

After Creating The Asset, Create A Token

As mentioned previously, two tokens will have to be created for the purpose of tokenizing our two fictitious assets. The API calls below show how one might create these two tokens, with the assumption being that we only need 100 tokens to represent percentage ownership. For this example, fractional percentage ownership of up to four decimal places can be used (e.g., 5.1200%). Of course, one would provide the proper PIN for the SigChain on which the tokens are being created.

tokens/create/token pin=1234

tokens/create/token pin=1234
name=Ownership in Self Portrait

The following screenshots shows the corresponding process using the wallet of creating the token representing ownership in the real estate asset. First, on the User screen, go to the Tokens tab. There you will see the Create new token button.

This screenshot demonstrates the filled fields for the real estate asset’s ownership token. The supply is set at 100 to easily represent percentage amounts, and by allowing 4 decimal places, someone might have 45.5123% ownership in the asset. Note that with this supply parameter, the fee for creating this token is currently 400 NXS. Click the Create token button to submit the form fields and create the token.

The formula for calculating the fee for creating a token is (log10(TotalSupply) - 2) * 100 NXS, with a minimum of 1 NXS. TotalSupply is the number of divisible token units, so, in our case 100 tokens divisible into 4 decimal places is 1,000,000 divisible units. Thus, 400 NXS to create this token.

After creating the token, the wallet prompts to create an account. This isn’t a requirement unless the SigChain (in this case, bobby.walsh) will also be represented in the ownership of the asset.

Tokenizing The Assets

Now that the assets and tokens have been created, the asset can be tokenized. The following API calls illustrate how this might be done from the Nexus wallet console.

assets/tokenize/asset pin=1234

assets/tokenize/asset pin=1234
name=Self Portrait token_name=Ownership in Self Portrait

Note that, as with most of the API calls, the asset and token addresses can be used as an alternative to the names that are used in the example above. Here is what it looks like when these API calls are issued from the wallet’s console.

Owners Create a Token Account to Receive Ownership

Once the assets have been tokenized, the tokens can be distributed to the owners in their allotted percentages. Note that to participate in the ownership of the assets, the SigChain on which the assets and tokens were created will also need accounts for the tokens used to tokenize the assets, and will also need tokens sent to those accounts.

The next screenshots demonstrate the process of creating an account for the token just used to tokenize the real estate asset. The account is being created on the SigChain of claudia.hush, who we will then give 45% ownership of the real estate asset to.

First, Claudia needs to look up the token for which she will create the account. The lookup function is on the User screen in the Tokens tab. At the top right of the tab is a Lookup a token button. Clicking that button displays the following input where she can enter the fully-qualified name (e.g., including the SigChain) of the token representing ownership in the real estate asset. The Lookup this token button retrieves the token information from the blockchain.

Here we see that Claudia has found the token. She can now create the token account on her SigChain by clicking the Create new account with this token button. On the resulting prompt, she confirms to create the account.

Conferring Ownership of an Asset on a SigChain

Now that the SigChains of the owners have accounts for the tokens with which the real estate asset was tokenized, the owner of the token (e.g., bobby.walsh) can transfer a percentage of tokens to the accounts in order to represent partial ownership. This includes a token account on his own SigChain as well as a token account on the SigChain of claudia.hush. The following screenshot demonstrates Bobby transferring 45 tokens (45% ownership in the real estate asset) to Claudia’s token account.

After transferring the remaining tokens to his own token account, the following screenshot reflects that Bobby now owns 55% ownership in the real estate asset.

Revenue Splitting

Once Claudia’s 45% ownership in the tokenized asset is represented by her SigChain’s possession of 45 of the tokens used to tokenize the asset, she qualifies for 45% of the revenue paid to the asset. For our example, a third entity, harry.twilight is paying rent on the real estate asset, in this case 100 NXS. In addition to NXS, he could have paid with any fungible token residing on the Nexus blockchain. As seen below, Claudia receives 45 NXS from Harry’s payment of 100 NXS (topmost CREDIT transaction). The second topmost transaction shows where Claudia received the 45 tokens representing her ownership stake in the real estate asset.


Nexus has simplified the blockchain tokenization process so that even ordinary users can monetize their own creations with appropriate royalty allocations. This has wide reaching implications to a variety of industries. Many of the applicable use cases and respective industries are depicted in the diagram on the What is Nexus webpage.

This guide provides details on how to install the Nexus Invoice System module, create a new invoice, and pay an invoice. Screenshots from the current Nexus wallet along with descriptions provide users with the knowledge required to use this fairly simple module for accounting tasks on the Nexus network. To read more about the applications of the system, please read Invoicing.

Installing The Invoicing Module

The Module section of the Nexus wallet is accessible via the top Settings menu or gears icon on the bottom. Choose the Modules section within the Settings screen. The following screenshot shows the Modules section without any modules installed.

As the instructions on the screen indicate, installing a module is as simple as dragging a module's archive file (e.g., tar.gz archive file) into the field on the screen.


Upon dragging the invoicing module’s archive file onto the screen depicted above, the following prompt is displayed. If everything is as expected (e.g., the module hash matches that listed on the github repository), click the Install Module button to begin installation.


The following prompt is presented to indicate that the module has been successfully installed. Upon dismissing this prompt, the wallet will be restarted.


Now, as a result of installing the invoicing module, it is included in the list of installed modules, and the toggle button indicates that the module is active.

Note also that a new icon has been added to the bottom of the wallet for the Nexus Invoice System.


Introducing the Nexus Invoice System

Running the Nexus Invoice System is as simple as clicking on the icon at the bottom of the wallet screen which was added when the module was installed. The first time the module is run, the Nexus Invoice System is displayed with an empty list of invoices. On subsequent review after creating invoices, this is where they will be listed.


Before getting into the creation of invoices, it is worth noting that the More options dropdown displayed above reveals additional fields with which invoices can be searched, as shown in the screenshot below. These fields include Description, the Payable account, the Recipient identifier (e.g., the username for a SigChain), and a toggle to cause only past due invoices to be displayed.


Creating New Invoices

To create a new invoice, click the +New Invoice button shown in the above screenshot. The following screen is displayed where details comprising this invoice are entered. These details include Description, Reference (typically used to tie an invoice and payment to an accounting ledger item), Number (used to help identify particular invoices), and Due Date.


In the From group of fields, the Account Payable information for this invoice is specified, which is used to indicate which account within the sender’s SigChain will receive the funds once paid. In addition, the Sender Details for this invoice can be specified, for instance, to include the human-readable name of the person being paid in this invoice.

The following screenshot shows the dropdown in the From section which lists the accounts to where the funds for this invoice could be paid. Choose one from the list.


The next screenshot shows in the To section, the Recipient field is filled out. This field takes the username or hash of the SigChain that will be paying this invoice. Below that, in the To section, Recipient Details could be included such as the human-readable name associated with the paying SigChain (if the hash is being used to identify the SigChain).


Further down on the invoice screen, the Items section holds the specific elements being invoiced. In the example shown below, the recipient is being invoiced for laptop upgrade items: memory, an SSD, and labor. For each item, the unit cost in NXS is provided, as is the number of units being invoiced. The module multiplies these to get the Total for each item. It also totals all items to show the Total for this invoice at the bottom right. The total is listed in NXS and the currency configured to be shown in the wallet (in this case USD).

Note that the invoice screen has two buttons at the bottom of it: Submit and Save As Draft. Next to the Submit button the fee in NXS for submitting the form is displayed.


The following screenshot shows the invoice saved as a draft. Note that at this point, the Reference does not display. However, draft invoices can be displayed by selecting DRAFT from the Status dropdown at the top of the invoice module.


Upon clicking the Submit button to send an invoice to the recipient, the following prompt is presented to enter the PIN for the SigChain from which the invoice is being sent.


After submitting an invoice, it displays in the list of invoices with a Status of OUTSTANDING. Note that this is how the invoice will be displayed to both the sender and receiver.


Paying (or Canceling) an Invoice

If the sender wants to cancel the invoice, they should open the invoice and click the Cancel button. A prompt to enter the sender’s SigChain PIN will be presented, and after entering the PIN, the invoice will be marked CANCELLED.

To pay the invoice, the receiver clicks on the invoice in the list of invoices (as displayed above). The following prompt will be displayed.


Clicking the Pay button presents a prompt allowing the payer to choose an account from their SigChain from which the invoice will be paid. The dropdown on this prompt lists all available accounts from which the payer can choose.


After selecting the payment account, the payer clicks the Pay with this Account button to indicate their designation. A confirmation prompt, shown below, is presented to validate the payer’s intention to fulfill this invoice.


As a final confirmation and authentication, when the payer clicks the Yes button (above) to indicate their confirmed intention to fulfill the invoice, they are presented with a prompt to enter their SigChain’s PIN.


Finally, the invoice is marked PAID. The screenshot below depicts what displays in both the sender’s and receiver’s list of invoices in the invoice module.


The following screenshot shows from the receiver’s perspective the transaction resulting from paying the invoice. The screenshot was taken before any blockchain confirmations of the transaction had been applied.


The ensuing screenshot shows both the invoice creation transaction (the lower one with the FEE deducted) and the transaction in which the sender has been paid.



This concludes the basic instructions for invoice usage and functions. More features are under development and this guide will be updated as these are released. If you have any questions, comments or suggestions please feel free to reach out on our social media channels or github page that are linked at the bottom of this webpage.