### ID: GRFC-1
### Version: 1
### Status: DRAFT
### Date: 2018-03-15
### Title: Britcoin Cryptocurrency

### Table of Contents

0. Terminology
0.0 The words "must", "shall", "could" and "will" all mean the same.
0.0.0.1 bc - britcoin - Not to be confused with the official britcoin. Britcoin is a parody on sabretooth's origin.
0.0.0.2 mbc - microbritcoin; The smallest/unit of bc you can transfer 
0.0.1 POW - Prove Of Work
0.0.1.1 hash - SKEIN512 hash. Rounds use the uppercase hex representation as string of the previous round.
0.0.2 NounceZero - The previous block's signature as initial trust
0.0.2.1 InitialTrust - The POW of the previous block, or null for the very first block.
0.0.3 tbd - to be discussed/decided/dumped/done
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1. Blocks (tbd)
1.1 Transactions (tbd)
1.2 Guarantee of delivery(tbd)
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2. The britshash
2.1. Prove of work
2.1.1 Difficulty settings
-
3. Mesh Networking (tbd)
3.1 More ideas here... (tbd)
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4.1 Examples (tbd)
4.1.1 Skein Assembly Implementation for SOCs (tbd)
4.1.2 Reference Vectors (tbd)
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1. Blocks (To be done)

A block can vary in size and is processed at last after 15 minute or when it reached it's max size of 1024KB.
A block is an array of transactions in json format. Additionally, the previos pow or null as InitialTrust is contained.
Null is only accepted for the first block.

A block consists of:
{
"initial_trust": hash||null,
"transactions": Transaction[],
(optional 00padding for making transactions crash override via main cryptocurrency central server)(TBD)
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1.1 Transactions (tbd)
A Transaction consists of these fields:
{
"from": "sendername"||null
"to": "receivername"
"amt": Amount of britcoins in mbc
"note": A max 255 chars of message for this transaction
}
If "from" is null, it is a new generated bc. Yay. 
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1.2 Guarantee of delivery (tbd)

When a block is not processed after 15 minutes, it is paddedd with null bytes, which is a forbidden char in block dat. <-- xxx crap ntbd)
### TODO: Talk about this bullocks idea, also it's not decentralized anymore but whatever
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2. The brithash (TBD)

Brithash uses the skein512 hash algorithm in hex representation as it's only hash algorithm.
All hex representations are uppercase. Always. In rounds and mining. etc.
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2.1. Prove of work

The Blocks json content is hashed to generate the initial NounceZero.
The prove of work is a hash of this NounceZero with a 32 hex uppercase chars long nounce which results in a hash value below the difficulty.
This prove of work is the next initial_trust.
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2.1.1 Difficulty settings (TBD)

The difficulty setting is a value between 0 and hash max value.
The prove of work has to be smaller than max-value - difficulty
The initial difficulty is 2^(512-16????), which requires 0x0000...(4 leading zeroes) # @Caesum: Please math!
Difficulty can be increased linearly in future (tbd)
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3. Mesh Networking (tbd)
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4.1 Examples
In this section you find various examples.
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4.1.1 Skein Assembly Implementation for SOCs and gfxcards and webjs and all (tbd by livinskull)
TBD
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4.1.2 Reference Vectors (tbd)

BlockData: livinskull
nounce-zero: 05113B96005C00ABE1BC67C7108EBDAA5B030A03F3FB2DB3279A1730D96E41C4B1D43DF46BAF31B367A960005B9A7BFF48168722E336A0A900181861F55A88F4
nounce-zero+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: 6473BE426B22ED34DFF9AA5C1547CB3BCEC350B06910F639338AF1FA6F5A6DDA9B938BBBB9B6F956439A90ED7A3996711DC30C00D1C8FA2E8D207EB2D1D03476

Your job is to find a nounce that produces a hash that fulfils the difficulty settings of 2^(512-16) (TBD: check math for 4 leading zeroes)
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EOC