The hope is to offer cold storage for up to $20 billion worth of cryptocurrency. Cryptocurrency exchanges and brokers want cold storage because custodians would take the problems and liabilities associated with storage.
For example, many exchanges and brokers have a hard time getting insurance for stored assets. However, established custodians like BNY Mellon already have such insurance.
On the positive side, all that is standing between companies and BNY Mellon and cryptocurrency storage is SEC approval. On the negative side, the cryptocurrency market has dropped dramatically in recent weeks losing up to 80% of its value.
The cryptocurrency market is certainly huge, BNY Mellon estimates that there are 1,000 cryptocurrencies with a market capitalization of $400 billion. On the other hand, US equities have a market capitalization of $25 trillion.
Therefore, cryptocurrency is a small portion of the global economy. However, cryptocurrency is growing fast.