Implemented and activated Identity module

[markopoloparadox]

Overview

A federated naming system, allowing for multiple registrars to be added from a specified origin. Registrars can set a fee to provide identity-verification service. Anyone can put forth a proposed identity for a fixed deposit and ask for review by any number of registrars (paying each of their fees). Registrar judgements are given as an enum, allowing for sophisticated, multi-tier opinions.

Some judgements are identified as sticky, which means they cannot be removed except by complete removal of the identity, or by the registrar. Judgements are allowed to represent a portion of funds that have been reserved for the registrar.

A super-user can remove accounts and in doing so, slash the deposit.

All accounts may also have a limited number of sub-accounts which may be specified by the owner; by definition, these have equivalent ownership and each has an individual name.

The number of registrars should be limited, and the deposit made sufficiently large, to ensure no state-bloat attack is viable.

Interface

Dispatchable Functions
For general users

• set_identity - Set the associated identity of an account; a small deposit is reserved if not already taken.
• clear_identity - Remove an account's associated identity; the deposit is returned.
• request_judgement - Request a judgement from a registrar, paying a fee.
• cancel_request - Cancel the previous request for a judgement.

For general users with sub-identities

• set_subs - Set the sub-accounts of an identity.
• add_sub - Add a sub-identity to an identity.
• remove_sub - Remove a sub-identity of an identity.
• rename_sub - Rename a sub-identity of an identity.
• quit_sub - Remove a sub-identity of an identity (called by the sub-identity).

For registrars

• set_fee - Set the fee required to be paid for a judgement to be given by the registrar.
• set_fields - Set the fields that a registrar cares about in their judgements.
• provide_judgement - Provide a judgement to an identity.

For super-users

• add_registrar - Add a new registrar to the system.
• kill_identity - Forcibly remove the associated identity; the deposit is lost.

References

Parent issue: https://github.com/availproject/engineering/issues/84

[delroybosco]

Have we tested this internally? @markopoloparadox

[markopoloparadox]

Have we tested this internally? @markopoloparadox

I haven't done it. It's on my TODO list :)