Tutorial: Non-Fungible Tokens on Tezos Using FA2

This tutorial shows how to originate and interact with the FA2 NFT contract. The tutorial uses an FA2 NFT contract written in LIGO smart contract language and a command line interface (CLI) to originate and interact with the NFT contracts either on the Flextesa sandbox or Tezos testnet (Ghostnet).

Disclaimer: We highly recommend users to take necessary precautions before following this tutorial and interacting with experimental technology. Use this tutorial at your own risk.

Table of Contents

• Introduction
  • What is FA2 (TZIP-12)?
  • What is a Non-Fungible Token (NFT)?
• Tutorial
  • Prerequisites
  • The CLI Tool
  • Initial Setup
  • Create NFT Collection
    • Prepare NFT Collection Metadata
    • Originate NFT Collection Contract
    • Prepare Tokens Metadata
    • Pin Tokens Metadata on IPFS
    • Mint Tokens
  • Inspect The NFT Contract
    • Inspect Token Metadata
    • Inspect Token Balances
  • Transfer Tokens
  • Operator Transfer
  • Configuration
    • Network Configuration Commands
    • Alias Configuration Commands

Introduction

What is FA2 (TZIP-12)?

FA2 refers to a token standard (TZIP-12) on Tezos. FA2 proposes a unified token contract interface, supporting a wide range of token types. The FA2 provides a standard API to transfer tokens, check token balances, manage operators (addresses that are permitted to transfer tokens on behalf of the token owner) and manage token metadata.

What is a Non-Fungible Token (NFT)?

An NFT (non-fungible token) is a special type of cryptographic token which represents something unique; non-fungible tokens are thus not mutually interchangeable. NFTs can represent ownership over digital or physical assets like virtual collectibles or unique artwork.

For each individual non-fungible token, the FA2 assigns a unique token ID and associates it with the token owner address. The FA2 API enables the inspection of token balances for the specific token ID and token owner address. For NFTs the balance can be either 0 (which means that the address does not own this particular token) or 1 (the address owns the token).

To enable discovery of the token contracts and tokens by indexers, wallets, market places and other DApps, the FA2 contract also associates some metadata with each token. At least, each token metadata has the name attribute. However, it is also possible to provide extended metadata such as an associated image or document URL and its crypto-hash. The metadata format is described in TZIP-12 and TZIP-21 (rich metadata) standards.

Tutorial

Prerequisites

• Node.js must be installed. The Node installation must also include npm (Node package manager).

• Docker must be installed. You need docker to run Flextesa sandbox. You might skip docker installation if you plan to run this tutorial on the testnet (Ghostnet) only.

The CLI Tool

You will need to install tznft CLI tool. After the installation, you can invoke various commands in the form of tznft <command> [options]. tznft provides the following command categories:

• configuration and bootstrapping Tezos network and configure address aliases
• generate and validate NFT collections and tokens metadata
• create NFT collection (FA2 contract origination) and mint tokens
• token inspection
• token transfer
• pin files and directories to Pinata IPFS server

The commands will be explained in more detail below. You can always run

$ tznft --help

to list all available commands.

Initial Setup

1. Install @oxheadalpha/tznft npm package:

   $ npm install -g @oxheadalpha/tznft
   

   The command installs tznft CLI tool.

2. Create a new project directory to keep your project configuration and other files:

   $ mkdir nft-tutorial
   $ cd nft-tutorial

3. Initialize tutorial project:

   $ tznft init
   
   tznft.json config file created

4. Check that the default active network is sandbox:

   $ tznft show-network
   
   active network: sandbox

5. Bootstrap Tezos network:

   $ tznft bootstrap
   
   ea4b3e3c52c37214344cbd82988c475f84125546ca6534c0ce870582e688ca18
   
   starting sandbox...
   connecting to Tezos node rpc...
   connecting to Tezos node rpc...
   connecting to Tezos node rpc...
   connecting to Tezos node rpc...
   connecting to Tezos node rpc...
   sandbox started

   If you are bootstrapping a sandbox network for the first time, Docker will download the Flextesa docker image as well.

   The default configuration comes with two account aliases bob and alice that can be used for token minting and transferring.

   The bootstrap command starts and initializes a sandbox. If you are using testnet or mainnet Tezos networks, bootstrap command has no effect and can be skipped.

Create NFT Collection

To create a new NFT collection (FA2 contract) we would follow the steps bellow:

1. Prepare collection (FA2 contract) metadata.
2. Create a collection (originate a contract).
3. Prepare tokens metadata.
4. Pin tokens metadata on IPFS
5. Mint tokens.

Prepare NFT Collection Metadata

create-collection-meta command generates a new contract metadata JSON file and requires <collection_name> parameter.

$ tznft create-collection-meta <collection_name>

Example:

$ tznft create-collection-meta my_collection

Created collection metadata file my_collection.json

my_collection.json file contains a template for the collection contract metadata:

{
  "name": "my_collection",
  "description": "Awesome NFT collection",
  "homepage": "https://github.com/oxheadalpha/nft-tutorial",
  "authors": [
    "John Doe <[email protected]>"
  ],
  "version": "1.0.0",
  "license": {
    "name": "MIT"
  },
  "interfaces": [
    "TZIP-016",
    "TZIP-012",
    "TZIP-021"
  ],
  "source": {
    "tools": [
      "LIGO"
    ],
    "location": "https://github.com/oxheadalpha/nft-tutorial"
  }
}

You can edit the file before using it to originate a collection contract. Please refer to the contract metadata TZIP-16 and FA2 Contract Metadata standards for more details.

validate-collection-meta command validates contract metadata JSON and requires the following parameters:

• <metadata_file> path to a metadata JSON file
• --errors_only optional flag to suppress validation warning messages

Example:

$ tznft validate-collection-meta my_collection.json

Warning: It looks like "description" has a sample value. Replace with a real description or remove it
Warning: It looks like "homepage" has a sample value. Replace with a real URL or remove it
Warning: It looks like one of the authors is a sample 'John Doe <[email protected]>'. Replace with a real author e-mail or URL or remove it

Originate NFT Collection Contract

create-collection command originates FA2 collection contract and requires the following parameters:

• <owner> alias or address of the new collection owner
• --meta_file <file> path to a new collection metadata file
• --alias <alias> optional alias for a new collection contract address

$ tznft create-collection <owner> --meta_file <file> --alias <alias>

Example:

$ tznft create-collection bob --meta_file my_collection.json --alias my_collection

originating new NFT contract...
originated contract nft with address KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
consumed gas: 2799
alias my_collection has been added

You can inspect newly created contract using TZComet or BCD contract explorers by copying and pasting a new contract address. TZComet can automatically discover a contract on either Tezos mainnet, testnet or a locally running sandbox. BCD can discover contracts on mainnet and testnet only.

Prepare Tokens Metadata

create-nft-meta command generates a new token metadata JSON file and requires the following parameters:

• <nft_name> name of the token
• <creator> alias or address of the NFT collection owner
• <uri> token artifact URI

$ tznft create-nft-meta <nft_name> <creator> <uri>

Token metadata can store a reference to some external document and/or image. This tutorial supports storing external data on IPFS and keeping an IPFS hash as a part of the token metadata (which we will store on IPFS as well).

Let's create metadata for an NFT token which references an image on IPFS with the hash code (CID) QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj.

Example:

$ tznft create-nft-meta Token1 bob ipfs://QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj

Created token metadata sample file Token1.json

Token1.json file contains a template for the token metadata:

{
  "decimals": 0,
  "isBooleanAmount": true,
  "name": "Token1",
  "description": "",
  "tags": [
    "awesome",
    "nft"
  ],
  "minter": "tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU",
  "artifactUri": "ipfs://QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj",
  "displayUri": "ipfs://QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj",
  "thumbnailUri": "ipfs://QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj",
  "creators": [],
  "rights": "",
  "attributes": [
    {
      "name": "sample attribute",
      "value": "sample value"
    }
  ]
}

You can edit the file before using it to mint an NFT and create multiple metadata files per each token you intend to mint. You may edit generated and add many other attributes. Please refer to the rich metadata TZIP-21 standard for more details.

validate-nft-meta command validates token metadata JSON and requires the following parameters:

• <metadata_file> path to a metadata JSON file
• --errors_only optional flag to suppress validation warning messages

Example:

$ tznft validate-nft-meta Token1.json

Warning: Property "description" has empty string value. Consider removing or provide a value for the property.
Warning: Property "rights" has empty string value. Consider removing or provide a value for the property.
Warning: It looks like "tags" property contains sample values "awsome", "nft". Remove or replace them with actual tag values
Warning: It looks like "attributes" property contains sample attribute. Remove or replace it with actual attributes

For this tutorial, we will mint two tokens. We will use two token metadata files Token1.json and Token2.json derived from the generated template file. Both tokens will share the same artifactUri and would have different names. Feel free to customize tokens metadata as you see fit.

Pin Tokens Metadata on IPFS

Before minting tokens, you need to pin token metadata files to IPFS and use their IPFS URIs for minting. There are multiple ways to do this, but in this tutorial we will use Pinata. First, you need to create a Pinata account (there is a free option available). You can upload (pin) Token1.json and Token2.json files created on the previous step manually or use tznft CLI.

Create Pinata keys using Pinata's web UI. You would need an API key and a secret key.

Execute set-pinata-keys command that requires the following parameters:

• <pinata_api_key> Pinata API key
• <pinata_secret_key> Pinata secret key
• --force optional flag to override existing keys in configuration if any

$ tznft set-pinata-keys <pinata_api_key> <pinata_secret_key> --force

Example:

$ tznft set-pinata-keys 38dxxx e9fxxx --force
38dxxx e9fxxx
Pinata keys have been added.

Note: Pinata keys are stored in the tznft.json configuration file in your project directory. Please you caution to not share your secret Pinata key.

Use pin-file command to pin token metadata files on Pinata IPFS service. Required parameter:

• <file> path to a file to be pinned
• --tag IPFS tag (can be the same as file name)

$ tznft pin-file <file> --tag <tag>

Example:

$ tznft pin-file Token1.json --tag Token1

ipfs://QmfVUCoqRuR83Hhk9iJeobbqwDhdA1HLRGkbDQzdjHrezw

$ tznft pin-file Token2.json --tag Token2

ipfs://QmbAhKqNn9L3dP9pYoutsDq6UjqrjCTuJCNRkJDAF12GL8

There is also a similar command pin-dir to pin a whole directory on IPFS.

Mint Tokens

mint command requires the following parameters:

• <owner> alias or address of the nft collection owner.
• <collection> alias or address of the NFT collection contract created by create-collection command
• --tokens new token descriptors. Each token descriptor is a comma delimited string: '<token_id>, <token_metadata_uri>':

$ tznft mint <owner_alias> <collection_alias> --tokens <tokens_list>

Example:

$ tznft mint bob my_collection --tokens '1, ipfs://QmfVUCoqRuR83Hhk9iJeobbqwDhdA1HLRGkbDQzdjHrezw' '2, ipfs://QmbAhKqNn9L3dP9pYoutsDq6UjqrjCTuJCNRkJDAF12GL8'

minting tokens...
tokens minted

Alternatively, you can use mint-from-file command to specify token descriptors in a csv file instead of CLI. Required parameters:

• <owner> alias or address of the nft collection owner
• <collection> alias or address of the NFT collection contract created by create-collection command
• --toke_file <file> path to a file with definitions of new tokens

Let's create tokens.csv file as following:

3, ipfs://QmfVUCoqRuR83Hhk9iJeobbqwDhdA1HLRGkbDQzdjHrezw
4, ipfs://QmbAhKqNn9L3dP9pYoutsDq6UjqrjCTuJCNRkJDAF12GL8

and run mint-from-file command:

$ tznft mint-from-file bob my_collection --token_file tokens.csv

minting tokens...
tokens minted

You can mint multiple batches of tokens into the same NFT collection contract. The only requirement is that token IDs must be unique.

Once, you finished populating your NFT collection you can freeze it (i. e. prevent it from accepting more tokens).

mint-freeze command has the following parameters:

• <owner> alias or address of the nft collection owner
• <collection> alias or address of the NFT collection contract created by create-collection command

$ tznft mint-freeze <owner> <collection>

Example:

$ tznft mint-freeze bob my_collection

freezing nft collection...
nft collection frozen

Beware that freeze is a one way operation. Once a collection is frozen it is impossible to "unfreeze" it and mint more tokens.

Inspect The NFT Contract

Using KT1.. address (or an address alias) of the NFT contract created by the create-collection command, we can inspect token metadata and balances (i. e. which addresses own the tokens).

Inspect Token Metadata

show-meta command requires the following parameters:

• --nft alias or address of the FA2 NFT contract to inspect
• --tokens a list of token IDs to inspect

$ tznft show-meta --nft <nft_address_or_alias> --tokens <token_id_list>

Example:

$ tznft show-meta --nft my_collection --tokens 1 2

querying token metadata...
{
  "token_id": 1,
  "decimals": 0,
  "isBooleanAmount": true,
  "name": "Token1",
  "description": "My awesome token",
  "tags": [
    "awesome",
    "nft"
  ],
  "minter": "tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU",
  "artifactUri": "ipfs://QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj",
  "attributes": [
    {
      "name": "sample attribute",
      "value": "sample value"
    }
  ]
}
{
  "token_id": 2,
  "decimals": 0,
  "isBooleanAmount": true,
  "name": "Token2",
  "description": "My awesome token",
  "tags": [
    "awesome",
    "nft"
  ],
  "minter": "tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU",
  "artifactUri": "ipfs://QmRyTc9KbD7ZSkmEf4e7fk6A44RPciW5pM4iyqRGrhbyvj",
  "attributes": [
    {
      "name": "sample attribute",
      "value": "sample value"
    }
  ]
}

Beware that IPFS might require some time to propagate the information about pinned token metadata files. show-meta command may timeout if ran soon after the token metadata was pinned.

Inspect Token Balances

show-balance command requires the following parameters:

• --nft alias or address of the FA2 NFT contract to inspect
• --signer alias or address on behalf of which contract is inspected
• --owner alias or address of the token owner to check balances
• --tokens a list of token IDs to inspect

$ tznft show-balance --nft <nft_address> --signer <alias> --owner <alias> --tokens <token_id_list>

Example 1, check bob's balances:

$ tznft show-balance --nft my_collection --signer bob --owner bob --tokens 1 2

querying NFT contract KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
requested NFT balances:
owner: tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	token: 1	balance: 1
owner: tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	token: 2	balance: 1

Example 2, check alice balances:

$ tznft show-balance --nft my_collection --signer bob --owner alice --tokens 1 2

querying NFT contract KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
requested NFT balances:
owner: tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	token: 1	balance: 0
owner: tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	token: 2	balance: 0

Transfer Tokens

transfer command requires the following parameters:

• --nft alias or address of the FA2 NFT contract that holds tokens to be transferred
• --signer alias or address that initiates the transfer operation
• --batch a list of individual transfers. Each individual transfer is represented as a comma delimited string: <from_address_or_alias>, <to_address_or_alias>, <token_id>. We do not need to specify amount of the transfer for NFTs since we can only transfer a single token for any NFT type.

$ tznft transfer --nft <nft_address> --signer <signer> --batch <batch_list>`

Example, bob transfers his own tokens 1 and 2 to alice:

$ tznft transfer --nft my_collection --signer bob --batch 'bob, alice, 1' 'bob, alice, 2'

transferring tokens...
tokens transferred

Now, we can check token balances after the transfer:

$ tznft show-balance --nft my_collection --signer bob --owner bob --tokens 1 2

querying NFT contract KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
requested NFT balances:
owner: tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	token: 1	balance: 0
owner: tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	token: 2	balance: 0

$ tznft show-balance --nft my_collection --signer bob --owner alice --tokens 1 2

querying NFT contract KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
requested NFT balances:
owner: tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	token: 1	balance: 1
owner: tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	token: 2	balance: 1

Operator Transfer

It is also possible to transfer tokens on behalf of the owner.

bob is trying to transfer one of alice's tokens back:

$ tznft transfer --nft my_collection --signer bob --batch 'alice, bob, 1'

transferring tokens...
Tezos operation error: FA2_NOT_OPERATOR

As we can see, this operation has failed. The default behavior of the FA2 token contract is to allow only token owners to transfer their tokens. In our example, bob (as an operator) tries to transfer token 1 that belongs to alice.

However, alice can add bob as an operator to allow him transfer any tokens on behalf of alice.

update-ops command has the following parameters:

• <owner> alias or address of the token owner to update operators for
• --nft alias or address of the FA2 NFT contract
• --add list of pairs aliases or addresses and token id to add to the operator set
• --remove list of aliases or addresses and token id to remove from the operator set

$ tznft update-ops <owner> --nft <nft_address> --add [add_operators_list] --remove [add_operators_list]

Example, alice adds bob as an operator:

$ tznft update-ops alice --nft my_collection --add 'bob, 1'

updating operators...
updated operators

Now bob can transfer a token on behalf of alice again:

$ tznft transfer --nft my_collection --signer bob --batch 'alice, bob, 1'

transferring tokens...
tokens transferred

Inspecting balances after the transfer:

$ tznft show-balance --nft my_collection --signer bob --owner bob --tokens 1 2

querying NFT contract KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
requested NFT balances:
owner: tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	token: 1	balance: 1
owner: tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	token: 2	balance: 0

$ tznft show-balance --nft my_collection --signer bob --owner alice --tokens 1 2

querying NFT contract KT1FpmL3pDfq1rc6WsftCPr5wfHkMLGyyYyx
requested NFT balances:
owner: tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	token: 1	balance: 0
owner: tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	token: 2	balance: 1

Token 1 now belongs to bob.

Configuration

tznft can be configured to interact with different Tezos networks. The user can also configure address aliases to sign Tezos operations and/or use them as command parameters when addresses are required. The default configuration that is created by tznft init command includes two pre-configured networks: sandbox and testnet (Ghostnet). Each pre-configured network has two bootstrap aliases: bob and alice.

Network Configuration Commands

• set-network <network> select specified pre-configured network as an active one. All subsequent commands will operate on the active network

  Example:

  $ tznft set-network sandbox
  
  network sandbox is selected

• show-network [--all] show currently selected network. If --all flag is specified, show all pre-configured networks

  Example:

  $ tznft show-network --all
  
  * sandbox
    testnet
    mainnet

• bootstrap bootstrap sandbox and deploy helper Taquito view contract. If selected network is sandbox this command needs to be run each time sandbox is restarted. This command has no effect on other network types and can be skipped.

  Example:

  $ tznft bootstrap
  
  ea4b3e3c52c37214344cbd82988c475f84125546ca6534c0ce870582e688ca18
  
  starting sandbox...
  connecting to Tezos node rpc...
  connecting to Tezos node rpc...
  sandbox started

• kill-sandbox stop Flextesa sandbox process if selected network is sandbox. This command has no effect on other network types.

  Example:

  $ tznft kill-sandbox
  
  flextesa-sandbox
  
  killed sandbox.

The sandbox network (selected by default) is configured to bake new Tezos blocks every 5 seconds. It makes running the commands that interact with the network faster. However, all originated contracts will be lost after the sandbox is stopped.

If you are using testnet, your originated contracts will remain on the blockchain and you can inspect them afterwards using an explorer like BCD.

Note: Although testnet configuration already has two bootstrap aliases bob and alice, it is a good practice to create your own alias from the faucet file (see tznft add-alias-faucet command described below) and use it as a signer for the commands like mint and transfer. In this way, your Tezos operations will not interfere with the operations initiated by other users.

Alias Configuration Commands

tznft allows user to configure and use short names (aliases) instead of typing in full Tezos addresses when invoking tznft commands. Each network comes with two pre-configured aliases bob and alice. The user can manage aliases by directly editing tznft.json file or using the following commands:

• show-alias [alias] show address and private key (if configured) of the specified [alias]. If [alias] option is not specified, show all configured aliases.

  Example:

  $ tznft show-alias bob
  
  bob	tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	edsk3RFgDiCt7tWB2oe96w1eRw72iYiiqZPLu9nnEY23MYRp2d8Kkx
  
  $ tznft show-alias
  
  bob	tz1YPSCGWXwBdTncK2aCctSZAXWvGsGwVJqU	edsk3RFgDiCt7tWB2oe96w1eRw72iYiiqZPLu9nnEY23MYRp2d8Kkx
  alice	tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	edsk3QoqBuvdamxouPhin7swCvkQNgq4jP5KZPbwWNnwdZpSpJiEbq

• add-alias <alias> <private_key> add alias using its private key. Aliases that configured with the private key can be used to sign operations that originate or call smart contracts on chain. tznft commands that require Tezos operation signing have --signer option.

  Example:

  $ tznft add-alias jane edsk3QoqBuvdamxouPhin7swCvkQNgq4jP5KZPbwWNnwdZpSpJiEbq
  
  alias jane has been added
  
  $ tznft show-alias jane
  
  jane	tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb	edsk3QoqBuvdamxouPhin7swCvkQNgq4jP5KZPbwWNnwdZpSpJiEbq

  Warning: Your Tezos alias private key (along with other configuration) is stored in tznft.json file in the working directory. Use extreme caution when using private keys for the Tezos mainnet.

• add-alias <alias> <address> add alias using Tezos address (public key hash). Such aliases do not have associated private key and cannot be used to sign Tezos operations.

  Example:

  $ tznft add-alias michael tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb
  
  alias michael has been added
  
  $ tznft show-alias michael
  
  michael	tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb

• add-alias-faucet <alias> <faucet_json_file_path> add alias with private key from the faucet file (see Tezos Faucet). This command will not work on sandbox network. An alias configured from the faucet has the private key and can be used to sign Tezos operations.

  Example:

  $ tznft add-alias-faucet john ~/Downloads/tz1NfTBQM9QpZpEY6GSvdw3XBpyEjLLGhcEU.json
  
  activating faucet account...
  faucet account activated
  alias john has been added
  
  $ tznft show-alias john
  
  john	tz1NfTBQM9QpZpEY6GSvdw3XBpyEjLLGhcEU	edskRzaCrGEDr1Ras1U55U73dXoLfQQJyuwE95rSkqbydxUS4oS3fGmWywbaVcYw7DLH34zedoJzwMQxzAXQdixi5QzYC5pGJ6

• gen-keys --alias <alias> generate a new set of Tezos account keys. If alias option is specified, add newly generated keys to config.

  Example:

  $ tznft gen-keys --alias sarah
  
  new keys generated:	tz1VHJ4U4WyF58VWDyFCQ76EFV9BcFkzMPr2 edsk4M6wiX4pKX9SfgB6HDdSsYXtMuki4ryn6q3fHv3Vj5DSit9Ghn
  alias sarah has been added tznft.json config file was updated

  Warning: If you choose to store a new private key in tznft.json file in the working directory. Use extreme caution when using private keys for the Tezos mainnet.

• remove-alias <alias> remove alias from the selected network configuration.

  Example:

  $ tznft remove-alias john
  
  alias john has been deleted

• show-tz-balance <owner> show Tezos account balance in mutez. <owner> is an address or configured account alias.

  Example:

  $ tznft show-tz-balance sarah
  
  Owner tz1VHJ4U4WyF58VWDyFCQ76EFV9BcFkzMPr2 has 100,000,000 mutez

TBD

• Support TZIP-16 off-chain views