November 2021 was a pivotal month for the cryptocurrency market, according to a recent statement by global banking giant, JP Morgan. The bank's strategists have observed that the cryptocurrency market's structure has changed significantly.

As per the report, the Bitcoin futures market, which has traditionally been in a state of backwardation (where the spot price is higher than the futures price), moved to contango (where the futures price is higher than the spot price) in November. This shift indicates growing optimism among investors about future price increases. This change also suggests that the market structure has become more like traditional assets, which typically see their futures trade at a premium to the spot price.

Another significant shift noticed by the strategists was in the cryptocurrency market's liquidity. They observed that liquidity in the market improved considerably in November. This improvement is crucial as it makes the market more efficient, reducing the cost for investors to trade and hold cryptocurrencies.

Furthermore, JP Morgan strategists highlighted that the Ethereum market showed signs of maturing in November. They noted a decline in the 'basis', which is the difference between the futures price and the spot price. A narrowing basis is usually a sign of a more mature market and could indicate that Ethereum is becoming a more accepted and mainstream asset.

However, the bank's strategists caution that these changes do not necessarily mean that the crypto market is now free from risks. They pointed out that the market still remains highly volatile, with rapid price swings being a common occurrence. Moreover, it is also prone to regulatory changes that could significantly impact prices.

In conclusion, while November marked significant changes in the cryptocurrency market structure, making it resemble traditional financial markets more closely, it is essential to approach these markets with caution given their inherent volatility and regulatory uncertainties.