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

src/block/chain.c

@@ -0,0 +1,53 @@
+#include <block/chain.h>
+
+blockchain_t* Chain_Create() {
+    blockchain_t* ptr = (blockchain_t*)malloc(sizeof(blockchain_t));
+    if (!ptr) {
+        return NULL;
+    }
+
+    ptr->blocks = DYNARR_CREATE(block_t, 1);
+    ptr->size = 0;
+
+    return ptr;
+}
+
+void Chain_Destroy(blockchain_t* chain) {
+    if (chain) {
+        if (chain->blocks) {
+            DynArr_destroy(chain->blocks);
+        }
+        free(chain);
+    }
+}
+
+bool Chain_AddBlock(blockchain_t* chain, block_t* block) {
+    if (chain && block && chain->blocks) {
+        DynArr_push_back(chain->blocks, block);
+        return true;
+    }
+
+    return false;
+}
+
+block_t* Chain_GetBlock(blockchain_t* chain, size_t index) {
+    if (chain) {
+        return DynArr_at(chain->blocks, index);
+    }
+    return NULL;
+}
+
+size_t Chain_Size(blockchain_t* chain) {
+    if (chain) {
+        return DynArr_size(chain->blocks);
+    }
+    return 0;
+}
+
+bool Chain_IsValid(blockchain_t* chain) {
+    if (!chain || !chain->blocks) {
+        return false;
+    }
+    // Add validation logic here
+    return true;
+}