Static contracts¶
TokenRegistry¶
Address in v2: https://etherscan.io/address/0xf0E474592B455579Fe580D610b846BdBb529C6F7#code
It’s just a helper contract which gets the token list from the bZxProtocol contract and provides the token list in a more client-friendly way since it uses the ABIEncoderV2.
bZxProtocol¶
Address in v2: https://etherscan.io/address/0xd8ee69652e4e4838f2531732a46d1f7f584f0b7f#code
It’s a Proxy contract which supports having multiple implementation contracts, storing a mapping from call signature to implementation target.
Example implementation: LoanOpenings https://etherscan.io/address/0x471b40d3f490150e2dc581e01d14440dd3c1ce03#code
Warning
This means there can be more than one ‘implementation’ contract active at a time.
There are two ways to add an implementation contract (only by the contract’s owner):
- setTarget: add a (function signature, implementation contract) pair normally. Is an external function and can be handled but it’s seldom used
- replaceContract: does a delegatecall to the contract so it can register its own methods. doesn’t emit events and only the contract address is a parameter of the call. It’s the most frequently used.