Mine Genesis block :)

.gitignore

@@ -1,3 +1,5 @@
 
 /target
 **/*.rs.bk
+/src/main
+/.vscode

Cargo.lock

@@ -1,3 +1,122 @@
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Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 authors = ["nutomic"]
 
 [dependencies]
+rust-crypto = "^0.2"

src/lib/block.rs

@@ -0,0 +1,37 @@
+use std::collections::HashSet;
+use crypto::digest::Digest;
+use crypto::sha2::Sha256;
+
+#[derive(Debug)]
+pub struct Block {
+    pub height: u32,
+    pub hash: String,
+    pub previous_block_hash: String,
+    pub data: HashSet<u8>,
+    pub nonce: u32
+}
+
+const DIFFICULTY: u32 = 3;
+
+impl Block {
+
+    pub fn mine_block(&mut self) {
+        loop {
+            self.nonce += 1;
+            let hash = self.calculate_block_hash();
+            let prefix = "0".repeat(DIFFICULTY as usize);
+            if hash.starts_with(prefix.as_str()) {
+                self.hash = hash;
+                break;
+            }
+        }
+    }
+
+    pub fn calculate_block_hash(&self) -> String {
+        // TODO: use byte array instead of string for hashing
+        let data = format!("{}, {}, {:?}, {}", self.height, self.previous_block_hash, self.data, self.nonce);
+        let mut hasher = Sha256::new();
+        hasher.input(data.as_bytes());
+        hasher.result_str()
+    }
+}

src/lib/mod.rs

@@ -0,0 +1,3 @@
+//this part could go to a crate and be used by web
+pub mod block;
+

src/main.rs

@@ -1,3 +1,12 @@
+use std::collections::HashSet;
+extern crate crypto;
+
+mod lib;
+
+use lib::block::Block;
+
 fn main() {
-    println!("hello world")
+    let mut block = Block { height: 0, previous_block_hash: "".to_string(), hash: "".to_string(), data: HashSet::new(), nonce: 0};
+    block.mine_block();
+    println!("block is {:?}", block);
 }