It is not possible to be completely loss-proof in cryptocurrency as it is a highly volatile market. However, there are some coins that are considered low risk, especially those with large market caps and strong projects. Here are some coins that are relatively stable:

1. Bitcoin (BTC) - The largest and most stable coin.

2. Ethereum (ETH) – More stable and the second major cryptocurrency.

3. Binance Coin (BNB) - Binance's own platform coin.

4. Ripple (XRP) – Various financial institutions use it.

5. Cardano (ADA) - With a strong project.

6. Polkadot (DOT) – Due to interoperability features.

7. Solana (SOL) – Due to fast transaction processing.

8. Polygon (MATIC) - Increases the scalability of Ethereum.

9. Chainlink (LINK) – For Smart Contracts.

10. Litecoin (LTC) – One of the oldest and stable cryptos.