Editor's note:  Marc van der Chijs is a former Dutch serial entrepreneur in Shanghai turned venture capitalist in Vancouver. He lived and worked for over 13 years in China, where he co-founded popular online video sharing site Tudou.com. He is a big believer in bitcoin.

It seems banks have started to realize that bitcoin could be a major threat for them.

In the US many banks don't accept any bitcoin businesses as clients, possibly because of regulatory concerns and money laundering risks.

Individuals aren't free from bitcoin banking issues either. CoinDesk reported recently that a Swedish bank froze a customer's account for selling just 5 BTC.

Now it is the Netherlands' turn. A bank has taken matters a step further and simply blocked most of its customers from buying bitcoins at exchanges.

According to an article in the Dutch press, Rabobank cancelled 99% of its customers’ transactions with bitcoin exchanges on Tuesday and Wednesday.

Rabobank did not give a reason for this, but a spokesperson for Dutch bitcoin exchange BTCNext said it was because transactions are seen as potential fraud.

However, many clients of Rabobank could not finalize and complete their transaction, even after calling to confirm that their transfers were not fraudulent.

Coincidentally, I have an account at Rabobank that I have used to buy bitcoins. This worked well until September, but after that transactions did not get processed reliably. I assumed it was problem with the bitcoin exchange I was using, and accepted that I could not buy additional coins.

I now wonder if the bank may have been behind this issue all along. Could it be that the Rabobank has been intervening in its client’s transactions for far longer than just the past two days?

Because the bank claimed that the problems were technical and had been solved, I decided to try to buy five bitcoins just now through Rabobank.

The transaction went through until the moment I hit the pay button. Then I got an error message saying that my account number was not correct.

I tried this several times and each time I got the same error. Then I tried to transfer a small amount to someone else as a test, and guess what? The transaction went through right away! So Rabobank is still not allowing people to buy bitcoin.

I understand why a bank would try to do this, of course. This is money that people may normally leave in their savings accounts. When a customer decides to use it to purchase bitcoin the bank has less money on its books, meaning that they can't lend out as much as before. If just a few people would do this, it would not be a big issue. But when the general public starts to adopt bitcoin it could endanger part of the bank's business.

If I was running a bank, I would not try to stop bitcoin, but instead actively look at embracing the cryptocurrency.

Why not set up or buy a bitcoin exchange, or create an easy-to-use wallet and make sure that people keep their bitcoin deposits with you? Not only would it be great PR, but it could create a lot of new customers as well.

I understand that banks are conservative, but they are making the same mistakes as the music and newspaper industries did over the past ten years.

You can't stop financial innovation. If you can't beat them, then you’d better join them.