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

include/block/block.h

@@ -0,0 +1,36 @@
+#ifndef BLOCK_H
+#define BLOCK_H
+
+#include <stdint.h>
+#include <openssl/sha.h>
+#include <dynarr.h>
+#include <block/transaction.h>
+#include <stdbool.h>
+#include <string.h>
+#include <randomx/librx_wrapper.h>
+
+typedef struct {
+    uint8_t version;
+    uint32_t blockNumber;
+    uint8_t prevHash[32];
+    uint8_t merkleRoot[32];
+    uint64_t timestamp;
+    uint32_t difficultyTarget; // Encoding: [1 byte exponent][3 byte coefficient]; Target = coefficient * 256^(exponent-3)
+    uint64_t nonce; // Higher nonce for RandomX
+} block_header_t;
+
+typedef struct {
+    block_header_t header;
+    DynArr* transactions; // Array of signed_transaction_t
+} block_t;
+
+block_t* Block_Create();
+void Block_CalculateHash(const block_t* block, uint8_t* outHash);
+void Block_CalculateRandomXHash(const block_t* block, uint8_t* outHash);
+void Block_AddTransaction(block_t* block, signed_transaction_t* tx);
+void Block_RemoveTransaction(block_t* block, uint8_t* txHash);
+bool Block_HasValidProofOfWork(const block_t* block);
+bool Block_AllTransactionsValid(const block_t* block);
+void Block_Destroy(block_t* block);
+
+#endif