The configuration presented is NOT intended to be used on the public network. These are the parameters used for the Catapult Testnet version (MIJIN_TEST).

Namespaces allow you to create an on-chain unique place for your business and your assets on the NEM blockchain.

A namespace starts with a name that you choose, similar to an internet domain name. If one account creates a namespace, that namespace will appear as unique in the NEM ecosystem.

After registering your namespace, you have the ability to define your own subdomains, as well as the names for your mosaics.


On the internet, a domain can have a sub-domain. In NEM, namespaces can have subnamespaces.

It is possible to create multiple subnamespaces with the same name (example: and, bar is the subnamespace/sub-domain).

Namespaces can have up to 3 levels, a namespace and its two levels of subnamespace domains.

Register namespace transaction

Register namespace transaction is used to create and re-rent a namespace or subnamespace.


A namespace name must be unique and may have a maximum length of 64 characters.

Allowed characters are a, b, c, …, z, 0, 1, 2, …, 9, ‘, _ , -.

Parent namespace

If it is a subdomain, a reference to parent namespace name is required.


Level of the namespace. Namespace foo level is 0, whereas level is 1.


The public key of the namespace creator.

Renting duration

Renting duration represents the number of confirmed blocks we would like to rent our namespace for.

During the renting period, it is possible to extend the rental by sending a register namespace transaction with the extra-confirmed block to rent the namespace.

When a renting period ends, the namespace will become inactive, and you will have N blocks to re-rent it.