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According to this post, I can store arbitrary data in the blockchain (as the news about "child pornography in the blockchain" tell). Now I want to store "Hello World" in the blockchain.

Is there a newer website/service that supports me putting data into the blockchain? And what's the difference between a transaction in the blockchain and such a "message"? Is the structure different? Why could those researchers even find out that it's inappropriate content instead of a default transaction?

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  • "Is there a newer website/service that supports me putting data into the blockchain? " I know something in the ethereum platform. According to their whitepaper they allow us to store a message in ethereum blockchain. I didn't tried yet. lovecoin.online
    – Prayag k
    Commented Mar 29, 2018 at 16:26
  • I know that it works on the ethereum chain and I do also know how it works there. Solidity makes it easy. But the bitcoin blockchain seems to be different.
    – hardfork
    Commented Mar 29, 2018 at 18:23

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Have a look to these data sources:

And of course the "modern" (and cheapest) way is storing arbitrary data in segwit part of transactions. I do not know is there ready tool for it, but it is not very difficult to write it.

Is there a newer website/service that supports me putting data into the blockchain?

https://cryptograffiti.info/ (based on bitcoin cash blockchain)

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