ZIP 1001: Keep the Block Distribution as Initially Defined -- 90% to Miners

Thanks to:
* Str4d for the help with the specification.
* Daira for pointing out issues with my interpretation of how the current FR/ECC structure works.
* Sonya for her extensive help with this.
* Everyone else on the forum and ECC/Zfnd that helped me with this.

Co-Authored-by: Jack Grigg <str4d@electriccoin.co>
Co-Authored-by: Daira Hopwood <daira@electriccoin.co>
Co-Authored-by: Sonya Mann <sonya@zfnd.org>
Signed-off-by: Daira Hopwood <daira@electriccoin.co>

Keep the block distribution as initially defined.rst

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+::
+
+  ZIP: unassigned
+  Title: ZIP proposal Keep the block distribution as initially defined. 90% to miners
+  Owner: unassigned
+  Advocate: mistfpga (zcash forums) <steve@mistfpga.net>
+  Category: Protocol
+  Created: 2019-08-01
+  License: CC BY-SA 4.0 (Creative Commons Attribution-ShareAlike 4.0) [1]
+
+Originally posted and discussed `on the Zcash Community Forum <https://forum.zcashcommunity.com/t/zip-proposal-keep-the-block-distribution-as-initaly-defined-90-to-miners/33843>`__.
+
+
+`RFC2119 <https://tools.ietf.org/html/rfc2119>`__. references will be in CAPS.
+
+**The key words include "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL"**
+
+For clarity in this ZIP defines these terms:
+
+-  Mining software in the context of this zip refers to pool software, local mining software, or staking software.
+-  Mining is defined as the action of processing transactions, so this include proof of stake, if zcash would switch to that.
+-  Mining coins transferred via fees are considered rewards (infinite), coins generated via block generation are considered distribution (finite).
+-  Block distribution is defined as the block reward - transaction fees.
+-  Spirit is defined as what is the intended outcome of the zip.[2]
+-  Initial promise is non neutral language referencing the block distribution rules as initially set out.[3]
+
+Abstract
+========
+
+The spirit of this zip is to is to ensure that the FR ends.  It is not the intention of this zip to stop protocol based donations.
+
+It is a simplistic short zip.
+
+Hopefully it will be compatible with a number of other zips and can be worked into them.
+
+Out of Scope for this proposal
+==============================
+
+-  Governance on how decisions are made, this ZIP is not meant to be used as a form of governance. 
+-  Future funding
+-  It does not cover other donations or revenue streams. 
+
+Motivation
+==========
+
+-  The Founders Reward is set to expire in 2020.
+-  To honour the initial promise of giving 90% of total block distribution to miners. Therefore the protocol giving them 100% of the block distribution after the first halving.
+
+Requirements
+============
+
+-  The FR MUST end at the fist halving.
+-  This zip SHOULD NOT preclude the ECC from sourcing funding elsewhere, or from donations.
+
+Specification
+=============
+
+-  The existing Founders’ Reward consensus rules [4],[5] MUST be preserved.
+-  Specifically, `FoundersReward(height) MUST equal 0 if Halving(height) >= 1` (For clarity once the halving happens the FR stops. as per the rules outlined in [4],[5])
+-  This line of code is only meant to stop the FR not protocol based donations.
+-  Enforcing some kind of mandatory donation via whatever mechanism would be seen as continuation of the FR.
+
+Implications to other users 
+===========================
+
+-  Block distribution payouts to FR addresses will need to be removed from the codebase. (I think this already happens though)
+-  Pools and other software may need to make adjustments for this.
+ 
+Technical implementation
+========================
+
+-  ?
+
+References
+==========
+
+[1] https://creativecommons.org/licenses/by-sa/4.0/
+[2] If there is contradiction between Spirit and any other part of the proposal that needs to be addressed. in the even it is not addressed Spirit is assumed to overrule all.
+[3] Cant find the document! the one with the graph in it. will update.
+[4] Section 7.7: Calculation of Block Subsidy and Founders Reward. Zcash Protocol Specification, Version 2019.0.0 [Overwinter+Sapling] 
+[5] Section 7.8: Payment of Founders’ Reward. Zcash Protocol Specification, Version 2019.0.0 [Overwinter+Sapling]
+