Cryptocurrencies have a set of fundamental characteristics that make them resilient and ensure their long-term existence:

1. Decentralization: Most cryptocurrencies are built on blockchain technology, providing a decentralized nature. This means there is no single point of control, making them less vulnerable to interference and control by a single organization or government.

2. Transparency: Blockchain technology also provides a high level of transparency and immutability of transactions. This eliminates the risks of manipulation and corruption that can be issues in traditional financial systems.

3. Global Access: Cryptocurrencies offer the opportunity for global financial transactions without borders and time constraints. This is particularly important for people in countries with limited access to traditional banking services.

4. Innovation and Development: Cryptocurrency and blockchain projects are constantly evolving, introducing new technologies and concepts. This innovative nature allows cryptocurrencies to adapt to changing conditions and challenges.

5. Global Interest: Increasing interest from investors and major financial institutions contributes to the widespread adoption of cryptocurrencies. This creates a sustained demand and supports their resilience.

All these factors collectively contribute to the long-term sustainability of cryptocurrencies. However, it's important to note that cryptocurrencies also face various challenges, such as regulation and security issues, which can impact their future.