BigInts, save/load, will make a calculation for block rewards soon

include/block/chain.h

@@ -4,6 +4,9 @@
 #include <block/block.h>
 #include <dynarr.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
 
 typedef struct {
     DynArr* blocks;
@@ -16,5 +19,10 @@ bool Chain_AddBlock(blockchain_t* chain, block_t* block);
 block_t* Chain_GetBlock(blockchain_t* chain, size_t index);
 size_t Chain_Size(blockchain_t* chain);
 bool Chain_IsValid(blockchain_t* chain);
+void Chain_Wipe(blockchain_t* chain);
+
+// I/O
+bool Chain_SaveToFile(blockchain_t* chain, const char* dirpath);
+bool Chain_LoadFromFile(blockchain_t* chain, const char* dirpath);
 
 #endif