CIP-1853 | Adjust preamble and structure w.r.t CIP-0001 (cardano-foundation#725)

* first draft remediation of CIP-1853

* spelled NA instead of standard N/A

* not quite so adopted as thought, so need 3 specific implementations

Co-authored-by: Ryan Williams <[email protected]>

* duplicating implementation status of other not-yet-implemented key paths

* continuing precedent of 3 wallets to signify active derivation path

* add Ledger App as implementation

Co-authored-by: Ryan Williams <[email protected]>

* add Vacuum Labs as implementor

Co-authored-by: Ryan Williams <[email protected]>

---------

Co-authored-by: Ryan Williams <[email protected]>

Author: rphair

CIP-1853/README.md

@@ -1,10 +1,15 @@
 ---
 CIP: 1853
 Title: HD (Hierarchy for Deterministic) Stake Pool Cold Keys for Cardano
-Authors: Rafael Korbas <[email protected]>
-Comments-URI: https://forum.cardano.org/t/stake-pool-cold-keys-hd-derivation/43360
-Status: Active
-Type: Standards
+Status: Proposed
+Category: Wallets
+Authors:
+  - Rafael Korbas <[email protected]>
+Implementors:
+    - Vacuum Labs <https://vacuumlabs.com/>
+Discussions:
+  - https://github.com/cardano-foundation/CIPs/pull/56
+  - https://forum.cardano.org/t/stake-pool-cold-keys-hd-derivation/43360
 Created: 2020-12-14
 License: CC-BY-4.0
 ---
@@ -13,13 +18,13 @@ License: CC-BY-4.0
 
 [CIP-1852] establishes how Shelley-era hierarchical deterministic (HD) wallets should derive their keys. This document is a follow-up of this CIP specifying how stake pool cold keys should be derived.
 
-## Motivation
+## Motivation: why is this CIP necessary?
 
 (Hierarchical) deterministic derivation of stake pool cold keys enables their restorability from a seed and most importantly, their management on hardware wallet devices. This in turn mitigates man-in-the middle attacks to which pool operators would otherwise be vulnerable if they managed their stake pool cold keys on a device not specifically hardened against alteration of the data to be signed/serialized without operator's explicit consent.
 
 ## Specification
 
-Using `1853'` as the purpose field, we define the following derivation path structure for stake pool cold keys.
+Using `1853'` as the purpose field, we define the following derivation path structure for stake pool cold keys:
 
 ```
 m / purpose' / coin_type' / usecase' / cold_key_index'
@@ -31,7 +36,7 @@ Here the `usecase` is currently fixed to `0'`.
 
 Given that stake pool cold keys are cryptographically the same as wallet keys already covered in CIP-1852, the master node and subsequent child keys derivation **MUST** be implemented in the same way as specified for wallets in CIP-1852.
 
-## Rationale
+## Rationale: how does this CIP achieve its goals?
 
 ### Why introducing a new purpose?
 
@@ -53,8 +58,19 @@ Each stake pool is supposed to be managed separately so there is currently no in
 
 We chose hardened derivation at the usecase index as there is no incentive to mix the stake pool cold keys with other potential usecases and if there was such incentive, it would most likely be more appropriate to create a separate usecase/purpose for that.
 
+## Path to Active
+
+### Acceptance Criteria
+
+- [ ] Standardisation of this derivation path among three wallets as of the Shelley ledger era.
+    - Ledger App Cardano <https://github.com/LedgerHQ/app-cardano>
+
+### Implementation Plan
+
+- [x] Common agreement on the above Motivation, Rationale and Specification during the planning of Cardano's Shelley release.
+
 ## Copyright
 
-This CIP is licensed under [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/legalcode)
+This CIP is licensed under [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/legalcode).
 
 [CIP-1852]: https://github.com/cardano-foundation/CIPs/blob/master/CIP-1852