SWS-4: Multi-Token Standard Interface

Status: Draft

Version: 1.0.0

Author: Jim Toth ([email protected])

Abstract

This document describes the standard interface for SmartWeave Contracts that represent multitple tokenized assets simultaneously.

Motivation

While most SmartWeave Contracts represent tokenized assets with a single, uniform balance structure, there are use cases for combining the balances of more than one token - fungible or non-fungible. For example, a developer may want to track a fungible balance alongside a non-fungible one. Other developers may want to track multiple balances of the same class of fungibility without being fungible between themselves.

Specification

The multi-token standard is identical to the SWS-2: Smartweave Token specification with the addition of an optional parameter tokenId. If tokenId is not provided it should be assumed the "default" token is desired.

Standard Interface

balanceOf

balanceOf(target: Address, tokenId?: string) => { target: Address, balance: number }

• Returns the current balance of a target address for a given tokenId

transfer

transfer(target: Address, qty: number, tokenId?: string) => void

• Transfers qty of tokenId tokens to target address
• SHOULD THROW if the caller does not have enough balance to transfer

name

name(tokenId?: string) => string | undefined

• Returns the name of the SmartWeave Token for tokenId

ticker

ticker(tokenId?: string) => string | undefined

• Returns the ticker of the SmartWeave Token for tokenId

decimals

decimals(tokenId?: string) => number

• Returns the number of decimal places the token amount should display for tokenId
• MUST return an integer

defaultToken

defaultToken() => string

• Returns the tokenId of the "default" token
• MAY be ommitted if the contract state includes a property defaultToken of type string.