This is absolutely impossible. There is no direct relation of the actual number of people using bitcoin to anything. If others may say that we can clearly see the increasing number of bitcoiner because of the price hike of bitcoin, it can be true but there is no direct relations because of the fluctuation of bitcoin's value. We cannot say that there is an increase of bitcoin users when the value of bitcoin increases nor there is a decrease of bitcoin users when the value of bitcoin also decreases. If we are talking about number of wallets and accounts, it is also impossible because may users of bitcoin have multiple wallets and multiple accounts. So practically speaking, we cannot determine the number of bitcoin users unless any government or international body imposes law that would make all users to register to their database first before they can make any transactions using bitcoin.

You are probably right mate, but isn't hard/difficult to do it, who among people here are patiently do that things for so many wallets that he/she going to count it. And true bitcoin was not 100% anonymous, its actually pseudonymous as we all know.

no more 100k people in the world using daily btc...  at least one time in the life I think we are around 500k users

If you mean a million users that day trade bitcoin to eek out small profits then maybe. However, I seriously doubt there are even 25k users that buy something daily with bitcoin.

The number of people that shop online, buy a beer at a bar, or send money to friends or family long distance is very small. Bitcoin is just too difficult and clumsy to use and there are too many better options available today for bitcoin to be that widely used.

Let us say that the bitcoin is not meant for a global take over because the block size is not capable of adapting more users to use at a single given time and so even with the current number of transactions we find it difficult to make everyone happy with the kind of delay we are encountering. It is really difficult to understand or determine the number of individuals using bitcoin but you can determine with the amount of transactions made per day and that could be the average.

I'm afraid we cannot determine the exact number of people who are owning Bitcoin. It is going to be very hard to track all of them. In the first place, they are scattered all over the world. Secondly, unlike bank accounts, Bitcoins are stored in wallets without any personal information linked to the account. We cannot count the each wallet as individual owner either because a single person can own several Bitcoin wallets. In the same manner that a single account cannot be counted a single Bitcoin owner because there are also accounts where the Bitcoins are owned by several people.

If you look around, it seems like everyone in the world is now buying bitcoin. Ever since the price surge started and all the news media started covering the rising price of bitcoin people want to buy more bitcoin. This raises a question – just how many people are using bitcoin in the world? We already know that there are around 16.7 million bitcoin in existence. How many people are these divided into? Let’s find out.

The first problem we run into is that bitcoin is an anonymous platform. When you give someone bitcoin or buy something from them you don’t share your name and you don’t get the other person’s name either. This is one of the major benefits of using bitcoins. It affords you an anonymity which you just do not find anywhere else. You get to do all of your transactions anonymously. Now, we know what you are wondering – how does anything get verified if you do not share your details which can be used to verify things?

Bitcoin has a genius solution to this. Whenever a user signs up for bitcoin they have to create a wallet. This virtual wallet is what they use to buy and sell bitcoins. Every bitcoin has a unique public key. So you can verify it by finding out the key of the wallet the bitcoin came from. You cannot connect the wallet to a real person, but you can verify the transaction and ensure that no fraud took place. The bitcoins go where they are supposed to because the keys are unique and no two people have the same key. There are around 14 million bitcoin wallets currently in the public ledger though if they keep growing at the same rate we will have 15 million wallets soon.

Now, you may think that this gives us a good estimate about the number of people using bitcoin, but there is a problem in using wallets to calculate bitcoin users. The problem is that a person isn’t limited to owning just one wallet. You can create as many wallets as you want, there is no restriction. Each wallet will have a unique key to it. Since the owner’s name isn’t registered with every wallet and isn’t made public, we cannot calculate the total number of wallets out there. Then there are the millions of people who created a wallet just to see what bitcoin was like but never really used bitcoin. Technically they are bitcoin users, but they aren’t really active so it isn’t right to count them.

Still, we can assume that there are easily around 10 million people using bitcoin right now, because most people will just have one wallet for their bitcoin. However, this is just an estimate. The only way to find out for sure would be to take identifying information from every bitcoin wallet owner but that would be a breach of the core values of bitcoin.

It is really difficult to determined the actual numbers of people throughout the whole world who are using bitcoin. But honestly speaking with the good news spreading to the whole world about bitcoin good benefits, I think bitcoin users were get increasing and increasing and might be bitcoin will become a future direct currencies.

I think every number is never accurate because each person can use multiple wallets and different accounts to participate in Bitcoin. So, I just predict that this number will increase and never stop because the crypty market is growing and has potential in the future.