SRC20 Registry Contract

• Smart Contract: globally across all SRC20

• Created: pre-exists / created only once

• Purpose: Registry of all SRC20 tokens created and the associated SWM stakes

• Example: On Ropsten

Feature Description

Glossary

Item	Description
(SWM) Stake	On Swarm token issuers are required to stake an amount of SWM token to trigger the minting and distribution of SRC20 tokens; the required stake amounts follow a staking rate card which has been adopted as a network policy by the Swarm Network

Read Functions

Function	Description
swmNeeded() returns (uint256)	Returns the SWM stake amount needed to mint an additional amount of specific SRC20 tokens; this function translates the Net Asset Value into USD denominated staking amounts based on the network policy and then uses the referenced SWMPriceOracle to translate them into SWM values based on current prices
contains() returns (bool)	Returns true when a SRC20 token address is successfully registered with this SRC20 Registry contract
getStake() returns (uint256)	Returns the amount of SWM staked for a specific SRC20
owner() returns (address)	Returns the address of the contract owner
isOwner() returns (bool)	Returns true if the caller is the contract owner
calcTokens()	External function allowing users to check the corresponding amount of SRC20 tokens that can be minted for a SWM stake value; responds in SRC20 in Wei (e.g. 1 = 1 additional SRC20); This differs from the calcStake() function in the Minter contract which is for staking/minting a brand new token. This function instead is for calculating the additional incremental stake on an existing SRC20 token
getMinter() returns (address)	Returns address of the Minter contract for a specific SRC20
getTokenOwner() returns (address)	Returns the address of the owner (and staker) of a specific SRC20

Write Functions

Function	Description
remove() returns (bool)	Removes specific SRC20 from the SRC20 Registry; can only be executed by the contract owner; returns true on success
addFactory() returns (bool)	Adds new factory to the SRC20 Registry contract address that can register a specific SRC20 token; returns true on success
removeMinter() returns (bool)	This proxy function removes a contract from the list of authorized minters; use the address of the Minter contract to remove; returns true on success
removeFactory() returns (bool)	This proxy function removes a SRC20Factory contract that can register a specific SRC20 token; use the address of the SRC20Factorycontract to remove; returns true on success
renounceManagement() returns (bool)	Allows the manager to renounce management for a specific SRC20 token address; returns true on success
getSrc20toSwmRatio() returns Amount()	External function for calculating how much SWM tokens are needed to be staked in order to get 1 SRC20 token
increaseSupply()returns (bool)	This function the token issuer can call in order to increase his SRC20 supply and stake his tokens; enter parameters with src20 (address of src20 token contract), swmAccount (address from which stake tokens are going to be deducted), and srcValue (Value of desired SRC20 token supply increase in unit256/Wei); returns true on success
renounceOwnership()	Contract owner can renounce ownership of the contract
transferManagement()returns (bool)	Allows the manager to transfer management for a specific SRC20 token address to a new address; returns true on success
addMinter()	This proxy function adds a contract to the list of authorized minters
mintSupply() returns (bool)	Mints additional supply of a specific SRC20 token based on SWM token stake; can be used for initial supply and subsequent minting of new SRC20 tokens; When used, Manager will update SWM/SRC20 values in this call and use it for token owner's increaseSupply() / decreaseSupply() calls, minting/burning SRC20 based on current SWM/SRC20 ratio. Only owner (Swarm network controlled address) of this contract can invoke this method; returns true on success
put()	Adds a SRC20 token to the SRC20 Registry; only factories can add; returns true on success
decreaseSupply() returns (bool)	This function the token issuer can call in order to decrease his SRC20 supply and receive his SWM stake; enter parameters with src20 (Address of src20 token contract), swmAccount (address to which SWM stake tokens will be returned), and srcValue (Value of desired SRC20 token supply decrease in unit256/Wei); returns true on success
transferOwnership()	Transfers ownership of this contract to another address. Can only be called by the contract owner