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include

include

include <openssl/sha.h> // For SHA-256 hashing

class Block { public: std::string data; std::string previousHash; std::string timestamp; std::string hash;

Block(const std::string& data, const std::string& previousHash)
    : data(data), previousHash(previousHash) {
    timestamp = std::to_string(time(nullptr)); // Get current timestamp
    hash = calculateHash();
}

std::string calculateHash() const {
    // Combine data, previousHash, and timestamp into a string
    std::string combined = data + previousHash + timestamp;

    // Calculate SHA-256 hash of the combined string
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    SHA256_Update(&sha256, combined.c_str(), combined.length());
    SHA256_Final(hash, &sha256);

    // Convert hash bytes to a string
    std::stringstream ss;
    for (int i = 0; i < SHA256_DIGEST_LENGTH; i++) {
        ss << std::hex << std::setw(2) << std::setfill('0') << (int)hash[i];
    }
    return ss.str();
}

};