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Assets Module

The Assets module can be used to manage fungible assets tokens (ERC20)

Overview

The Assets module provides functionality for asset management of fungible asset classes with a fixed supply, including:

  • Asset Issuance (Minting)
  • Asset Transferal
  • Asset Freezing
  • Asset Destruction (Burning)

Terminology

  • Admin: An account ID uniquely privileged to be able to unfreeze (thaw) an account and it's assets, as well as forcibly transfer a particular class of assets between arbitrary accounts and reduce the balance of a particular class of assets of arbitrary accounts.
  • Asset issuance/minting: The creation of a new asset, whose total supply will belong to the account that issues the asset. This is a privileged operation.
  • Asset transfer: The reduction of the balance of an asset of one account with the corresponding increase in the balance of another.
  • Asset destruction: The process of reduce the balance of an asset of one account. This is a privileged operation.
  • Fungible asset: An asset whose units are interchangeable.
  • Issuer: An account ID uniquely privileged to be able to mint a particular class of assets.
  • Freezer: An account ID uniquely privileged to be able to freeze an account from transferring a particular class of assets.
  • Freezing: Removing the possibility of an unpermissioned transfer of an asset from a particular account.
  • Non-fungible asset: An asset for which each unit has unique characteristics.
  • Owner: An account ID uniquely privileged to be able to destroy a particular asset class, or to set the Issuer, Freezer or Admin of that asset class.
  • Zombie: An account which has a balance of some assets in this pallet, but no other footprint on-chain, in particular no account managed in the frame_system pallet.

Goals

The assets system in BitGreen is designed to make the following possible:

  • Issue a new assets in a permissioned or permissionless way, if permissionless, then with a deposit required.
  • Allow accounts to hold these assets without otherwise existing on-chain (zombies).
  • Move assets between accounts.
  • Update the asset's total supply.
  • Allow administrative activities by specially privileged accounts including freezing account balances and minting/burning assets.

Interface

Permissionless Functions

  • create: Creates a new asset class, taking the required deposit.
  • transfer: Transfer sender's assets to another account.

Permissioned Functions

  • force_create: Creates a new asset class without taking any deposit.
  • force_destroy: Destroys an asset class.

Privileged Functions

  • destroy: Destroys an entire asset class; called by the asset class's Owner.
  • mint: Increases the asset balance of an account; called by the asset class's Issuer.
  • burn: Decreases the asset balance of an account; called by the asset class's Admin.
  • force_transfer: Transfers between arbitrary accounts; called by the asset class's Admin.
  • freeze: Disallows further transfers from an account; called by the asset class's Freezer.
  • thaw: Allows further transfers from an account; called by the asset class's Admin.
  • transfer_ownership: Changes an asset class's Owner; called by the asset class's Owner.
  • set_team: Changes an asset class's Admin, Freezer and Issuer; called by the asset class's Owner.

Public Functions

  • balance - Get the asset id balance of who.
  • total_supply - Get the total supply of an asset id.

Additional Documentation

Please refer to the module technical documentation for further information.