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Document kavadist infra rewards in the module spec (#1369)

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x/kavadist/spec/01_concepts.md
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# Concepts
The minting mechanism in this module is designed to allow governance to determine a set of inflationary periods and the APR rate of inflation for each period. This module mints coins each block according to the schedule such that after 1 year the APR inflation worth of coins will have been minted. Governance can alter the APR inflation using a parameter change proposal. Parameter change proposals that change the APR will take effect in the block after they pass.
Additionally this module has parameters defining an inflationary period for minting rewards to a governance-specified list of infrastructure partners. Governance can alter the inflationary period and infrastructure reward distribution using a parameter change proposal. Parameter changes that change the distribution or inflationary period take effect the block after they pass.

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x/kavadist/spec/05_params.md
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The kavadist module has the following parameters:
| Key | Type | Example | Description |
|------------|----------------|---------------|--------------------------------------------------|
| -------------------- | -------------------- | ------------- | -------------------------------------------------------- |
| Active | bool | true | an all-or-nothing toggle of token minting in this module |
| Periods | array (Period) | [{see below}] | array of params for each inflationary period |
| InfrastructureParams | InfrastructureParams | [{see below}] | object containing infrastructure partner payout params |
`InfrastructureParams` has the following parameters
| Key | Type | Example | Description |
| --------------------- | --------------------- | ------------- | ----------------------------------------------------------- |
| InfrastructurePeriods | array (Period) | [{see below}] | array of params for each inflationary period |
| CoreRewards | array (CoreReward) | [{see below}] | array of params for reward weights for core infra providers |
| PartnerRewards | array (PartnerReward) | [{see below}] | array of params for infrastructure partner reward schedules |
Each `Period` has the following parameters
| Key | Type | Example | Description |
|------------|--------------------|--------------------------|----------------------------------------------------------------|
| --------- | --------- | ---------------------- | --------------------------------------- |
| Start | time.Time | "2020-03-01T15:20:00Z" | the time when the period will start |
| End | time.Time | "2020-06-01T15:20:00Z" | the time when the period will end |
| Inflation | sdk.Dec | "1.000000003022265980" | the per-second inflation for the period |
Each `CoreReward` has the following properties
| Key | Type | Example | Description |
| ------- | -------------- | --------------------------------------------- | -------------------------------------------------------- |
| Address | sdk.AccAddress | "kava1x07eng0q9027j7wayap8nvqegpf625uu0w90tq" | address of core infrastructure provider |
| Weight | sdk.Dec | "0.912345678907654321" | % of remaining minted rewards allocated to this provider |
Each `PartnerReward` has the following properties
| Key | Type | Example | Description |
| ---------------- | -------------- | --------------------------------------------- | ---------------------------------- |
| Address | sdk.AccAddress | "kava1x0cztstumgcfrw69s5nd5qtu9vdcg7alqtyhgr" | address of infrastructure partner |
| RewardsPerSecond | object (coin) | {"denom": "ukava", "amount": "1285" } | per second reward for this partner |

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x/kavadist/spec/06_begin_block.md
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}
}
```
## Inflationary Coin Minting
The `MintPeriodInflation` method mints inflationary coins for the two schedules defined in the parameters when `params.Active` is `true`. Coins are minted based off the number of seconds passed since the last block. When `params.Active` is `false`, the method is a no-op.
Firstly, it mints coins at a per second rate derived from `params.Periods`. The coins are minted into `x/kavadist`'s module account.
Next, it mints coins for infrastructure partner rewards at a per second rate derived from `params.InfrastructureParams.InfrastructurePeriods`. The coins are minted to the module account but are then immediately distributed to the infrastructure partners.
## Infrastructure Partner Reward Distribution
The coins minted for the `InfrastructurePeriods` are distributed as follows:
* A distribution is made to each of the infrastructure partners based on the number of seconds since the last distribution for each of the defined `params.InfrastructureParams.PartnerRewards`.
* The remaining coins are distributed to the core infrastructure providers by the weights defined in `params.InfrastructureParams.CoreRewards`.

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x/kavadist/spec/README.md
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## Abstract
`x/kavadist` is an implementation of a Cosmos SDK Module that allows for governance controlled minting of coins into a module account. Coins are minted during inflationary periods, which each period have a governance specified APR and duration. This module does not provide functionality for spending or distributing the minted coins.
`x/kavadist` is an implementation of a Cosmos SDK Module that allows for governance controlled minting of coins into a module account. Coins are minted during inflationary periods, for which each period has a governance specified APR and duration. Additionally, coin rewards for governance specified infrastructure partners are minted and distributed.