From e0dc8c845aae20cacf16d3c442c418430dc3cbb3 Mon Sep 17 00:00:00 2001
From: Jake Hillion <jake@hillion.co.uk>
Date: Mon, 14 Jun 2021 22:43:43 +0100
Subject: [PATCH] Began adding chain logic

---
 Cargo.lock          |  4 ++++
 Cargo.toml          |  1 +
 currency/Cargo.toml |  9 +++++++++
 currency/src/lib.rs | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 47 insertions(+)
 create mode 100644 currency/Cargo.toml
 create mode 100644 currency/src/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index 12542f0..a9d5e2e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,9 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "currency"
+version = "0.1.0"
+
 [[package]]
 name = "farm"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index f49f66b..3cf612c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [workspace]
 
 members = [
+    "currency",
     "farm",
     "node",
     "plot",
diff --git a/currency/Cargo.toml b/currency/Cargo.toml
new file mode 100644
index 0000000..2ebd259
--- /dev/null
+++ b/currency/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "currency"
+version = "0.1.0"
+authors = ["Jake Hillion <jake@hillion.co.uk>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/currency/src/lib.rs b/currency/src/lib.rs
new file mode 100644
index 0000000..8be666e
--- /dev/null
+++ b/currency/src/lib.rs
@@ -0,0 +1,33 @@
+use std::collections::HashMap;
+
+type Hash = [u8; 64];
+type Signature = [u8; 64];
+type Address = [u8; 32];
+
+type ChainHeight = u64;
+type ChainSize = u64;
+type Cost = u128;
+type ChainIndex = u64;
+
+pub struct BeaconEntry {
+    pub prev: Hash,
+    pub height: ChainHeight,
+}
+
+pub struct ShardEntry {
+    pub prev: Hash,
+    pub height: ChainHeight,
+
+    pub transactions: Vec<Transaction>,
+}
+
+pub struct Transaction {
+    pub address: Address,
+    pub signature: Signature,
+}
+
+impl Transaction {
+    fn get_cost(transaction: &Transaction, sizes: HashMap<ChainIndex, ChainSize>) -> Cost {
+        todo!()
+    }
+}