chore(docs): add draft of MetaChain consensus (#101)

#### What this PR does / why we need it:

As per the title, this PR is a working draft version of MetaChain
Consensus.

Signed-off-by: Fuxing Loh <[email protected]>
Co-authored-by: Eli <[email protected]>

docs/:200:DeFiChain Basics/:100:what-is-metachain.md

@@ -2,16 +2,15 @@
 title: What is MetaChain?
 ---
 
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::
+
 `DeFiCh/metachain` started as a codename research & development
 for [DFIP 2111-B: VOC: Ethereum Virtual Machine (EVM) Support](https://github.com/DeFiCh/dfips/issues/96). Proposed as a
 DFIP on Nov 2021; DFIP 2111-B provided DeFiChain with more flexibility to think beyond what is possible today. It
 introduced a new dimension to the DeFiChain ecosystem, allowing us to stretch the definition of Native DeFi.
 
 - Smart contract capability through a turing-complete environment for faster paced innovation
 - Embrace the multi-chain future enabling easier cross compatibility and extensibility.
-
----
-
-:::div{class="admonitions red"}
-TODO
-:::

docs/:200:DeFiChain Basics/:110:what-is-nativechain.md

@@ -1,3 +1,8 @@
 ---
 title: What is NativeChain?
 ---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::

docs/:200:DeFiChain Basics/:120:what-is-dfi.md

@@ -1,3 +1,8 @@
 ---
 title: What is DFI?
 ---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::

docs/:200:DeFiChain Basics/:500:wallet.md

@@ -1,3 +1,8 @@
 ---
 title: DeFiChain Wallets
 ---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::

docs/:300:MetaChain Protocol/:100:whitepaper.md

@@ -1,3 +1,8 @@
 ---
 title: MetaChain Whitepaper
 ---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::

docs/:300:MetaChain Protocol/:200:consensus.md

@@ -0,0 +1,87 @@
+---
+title: MetaChain Consensus
+---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::
+
+## Proof-of-?
+
+'Proof-of-' is often colloquially referred to as the consensus mechanism generally agreed upon between multiple actors
+for moving the chain forward. Given there is no disagreement between multiple actors, a consensus is achieved. Since its
+genesis, DeFiChain has used a Proof-of-Stake (PoS) consensus mechanism adapted from Bitcoin Core's original
+Proof-of-Work (PoW) implementation for moving the chain forward.
+
+```mermaid
+graph LR
+
+n[UTXO Based Ledger]
+m[EVM Based Ledger]
+
+subgraph "NativeChain (PoS)"
+n
+end
+
+subgraph "MetaChain (PoA)"
+m
+end
+
+n --Mint Block--> m
+n --Propogate Block--> m
+
+```
+
+For the purpose of describing the different DeFiChain consensus at play, NativeChain refers to the UTXO Bitcoin-based
+chain, while MetaChain refers to the EVM-based chain.
+
+### Proof-of-Stake (PoS) at NativeChain
+
+NativeChain utilizes a Proof-of-Stake (PoS) algorithm similar to Bitcoin Core's original Proof-of-Work (PoW) mining
+algorithm. Validators are selected in proportion to their quantity of holdings in the associated cryptocurrency.
+
+NativeChain uses the concept of Masternode for its PoS implementation. To run a Masternode on NativeChain, a staker must
+hold a minimum of 20,000 DFI. Masternodes on NativeChain participate in active transaction validations and block
+creations. Each staking node can perform only 1 hash per second, with the nonce from the Bitcoin Core PoW algorithm
+replaced by a staker's masternode ID.
+
+### Proof-of-Authority (PoA) at MetaChain
+
+The Proof-of-Authority (PoA) is a consensus method that gives a designated number of actors the power to validate
+transactions within the network. MetaChain validators are Masternodes appointed from the NativeChain group of
+validators. Running a Masternode on NativeChain allows the actor to validate transactions on the MetaChain network as
+they do on the NativeChain network.
+
+## MetaChain Consensus-lite Design
+
+Operating on a consensus-lite design via Proof-of-Authority (PoA), the MetaChain embeds each EVM Block on the
+NativeChain. It relies on NativeChain peer-to-peer networking for block propagation. Connectivity between NativeChain
+and MetaChain is established through JSON-RPC, secured within a trusted communication medium.
+
+### Block Creation
+
+When the NativeChain validator finds a valid hash, it will instruct the attached MetaChain node to mint a new block. The
+attached MetaChain node will mint a new block encoded
+with [SCALE CODEC](https://docs.substrate.io/reference/scale-codec/). The newly minted block will be next on top of the
+current tip, embedded into the NativeChain block index and propagated via NativeChain peer-to-peer networking.
+
+### Block Connecting
+
+MetaChain has no peer-to-peer (p2p) networking capability; encoded blocks are imported and propagated via the
+NativeChain p2p network. The encoded blocks are imported into MetaChain during NativeChain `connectBlock()`. MetaChain
+does its block validation separately and in addition to NativeChain's validation. Once validated and indexed on
+MetaChain, NativeChain will deem the entire block as valid during the `connectBlock()` subroutine.
+
+### Benefits of a consensus-lite Design
+
+Utilizing a consensus-lite design removes the usual complexity and problems that arise from a consensus-heavy design.
+Piggybacking on NativeChain, we isolate and concentrate consensus design decisions into the NativeChain. Rollback and
+fork resolutions become a non-issue on MetaChain as the NativeChain handles it.
+
+> ### Precedent for Innovation
+>
+> To set the precedent for innovation, MetaChain consensus is designed to be consensus-lite for continuous and
+> sustainable iterative development. MetaChain is designed to be operated as a parallel subnet of the NativeChain; it
+> utilizes the NativeChain consensus mechanism to move the chain forward, allowing more subchains to be abstracted and
+> added.

docs/:300:MetaChain Protocol/:300:token-bridge.md

@@ -1,3 +1,8 @@
 ---
 title: MetaChain Tokens & Bridge
 ---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::

docs/:300:MetaChain Protocol/:600:node-upgrades.md

@@ -0,0 +1,8 @@
+---
+title: MetaChain Node Upgrades
+---
+
+:::div{class="admonitions yellow"}
+Currently work in progress — this article/page is consider draft, the information reflected here might not be
+up-to-date.
+:::