Copied TCP impl from other project, basic Block implementation, randomx pow, signing via secp256k1

include/block/chain.h

@@ -0,0 +1,20 @@
+#ifndef CHAIN_H
+#define CHAIN_H
+
+#include <block/block.h>
+#include <dynarr.h>
+#include <stdlib.h>
+
+typedef struct {
+    DynArr* blocks;
+    size_t size;
+} blockchain_t;
+
+blockchain_t* Chain_Create();
+void Chain_Destroy(blockchain_t* chain);
+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);
+
+#endif