Verification Contract

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Purpose
The verification contract manages verifiers and users verified by them. It allows:
Management (addition and removal) of verifiers by the admin
Management of user verification by verifiers
It helps to think of each verification as a separate identity of the user, similar to how one would have multiple digital accounts like Twitter, Github, or Youtube. Each identity can thus be thought of as There is an associated master address, to which additional child addresses can be linked (this is an important feature since oftentimes users utilize multiple wallet addresses actively).
Roles
Admin
Assignment
by deploying the contract
gaining ownership from previous owner
Permissions
Can transfer ownership to another admin
Can update contract implementation addresses
Verifier
Assignment
Onboarded by admin
Permissions
Can register, unregister user addresses to their verification method
Functionality
Adding a verifier
Adding a verifier is akin to adding a new verification method. The verifier handles all aspects of the registration process related to their verification method. Currently, new verifiers can only be added via admin. 
Function
function addVerifier(address _verifier) external onlyOwner {
Approvals
None
Restrictions
Only admin can call this function for now
Every verifier needs to be unique
Arguments
_verifier: address of the verifier for the new verification method
Registering a new user
Registering a user involves adding their address to the verifier's mapping. This simply involves setting masterAddresses[_masterAddress][msg.sender] as true to indicate _masterAddress is verified by msg.sender.
Function
function registerMasterAddress(address _masterAddress, bool _isMasterLinked) 
    external override onlyVerifier {
Approvals
None
Restrictions
_masterAddress mustn't already be registered with msg.sender
Arguments
_masterAddress: Address of the user being verified
_isMasterLinked: if true, _masterAddress will be usable to perform other functions (such as identifying users registered with a verifier). If false _masterAddress will purely be considered for registering the user. Further addresses associated with the _masterAddress via linkAddress() will only be considered for any activities pertaining to verification.
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Smart Contracts - Previous
Verification
Admin Verifier
Last modified 10mo ago
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Purpose
Roles
Admin
Verifier
Functionality
Adding a verifier
Registering a new user