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How people SPAM you with Bitcoin

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Recently I received a weird payment to my Bitcoin wallet. It was 1 Satoshi (0.00000001 Bitcoin) sent to me from an unknown address. I didn’t really understand why was this sent to me. Here’s an example of such a transaction:

Spam transaction


After searching around for the meaning of this I found a thread on BitcoinTalk explaining this. Apparently these are SPAM transactions.

How people use micro Bitcoin transactions to SPAM you

Let’s say you own a Bitcoin gambling website. You send out 1,000,000 transactions of 1 Satoshi (0.00000001 Bitcoin). This costs you 0.01 Bitcoins which is roughly $4. In each micro transaction you embed a message with your website’s name. For example “My Bitcoin SPAM Company”. It’s safe to say that out of 1,000,000 people that receive “free” money at least 1% will check out where it came from.

bitcoin spam

So now you have 10,000 people looking up your website on Google and perhaps becoming a client. Even if only 1 of these million becomes a paying customer you’re already at a profit. Of course there’s still a fee to pay for all of these transactions but it’s might still be a profitable method to get your name out there.

The fee structure of Bitcoin is set up in a way that you wouldn’t be able to scale such an operation, but apparently some companies still find it profitable.

How to embed SPAM messages inside a transaction

The Bitcoin protocol allows you to attach a message to a transaction. This is done through your Bitcoin wallet. Here’s an example of how to attach a message through

blockchain message


What can I do to prevent this SPAM ?

Unfortunately nothing. There’s no way to block specific addresses from sending you money at the moment. The good news is that it you shouldn’t be worried to much about it either. Just ignore these messages and in time spammers will hopefully find this less efficient. If this really annoys you, you can just archive your current Bitcoin address and use a new one that hopefully the spammers aren’t aware of.

Having delved into futures trading in the past, my intrigue in financial, economic, and political affairs eventually led me to a striking realization: the current debt-based fiat system is fundamentally flawed. This revelation prompted me to explore alternative avenues, including investments in gold and, since early 2013, Bitcoin. While not extensively tech-savvy, I've immersed myself in Bitcoin through dedicated study, persistent questioning, hands-on experience with ecommerce and marketing ventures, and my stint as a journalist. Writing has always been a passion of mine, and presently, I'm focused on crafting informative guides to shed light on the myriad advantages of Bitcoin, aiming to empower others to navigate the dynamic realm of digital currencies.

View all Posts by Alexander Reed

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14 comments on “How people SPAM you with Bitcoin”

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  1. These transactions are too small to be allowed by the current version of the bitcoin protocol, yet somehow they are being generated.

    I first noticed them in february before MTGOX lost all the bitcoin, like a hailstorm of covering fire, which gradually resolves away to nothing – otherwise the blockchain filesize would become too large.

    It ensures that whichever machine wins the mining contract is busy clearing up shrapnel for thw entire 10 minutes so there is no gap between bitcoin miners.

    They could even overlap by a few milliseconds which could be used to do unusual things on the blockchain.

  2. Riccardo Casatta

    “The Bitcoin protocol allows you to attach a message to a transaction” this is not correct! The web site gives you the possibility to do so. The message is not stored in the real bitcoin blockchain.

  3. Or give the spammers room to experiment, I don’t mind receiving more pointless satoshi’s. At least they are willing to innovate in Bitcoin and communication.

    1. True, but most of the times you won’t even receive them since the transaction won’t go through. You see the spammers don’t even pay the fee for these transactions so miners don’t pick them up most of the time. What you see is just an unconfirmed transaction.

  4. This is a very smart way to get known by a lot of people! These spammers are really smart and if they would only put their minds to doing some good, well, this world might be different. Great post!

  5. OK, the value is neglectable, but at least it’s better than spam email where you have to waste time junking them ;^>

  6. 1,000,000 transactions!!! WOW! That’s a lot of Satoshi!
    It’s amazing that this only amounts to $4! Good to know!

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