You can do that today: it is possible to embed arbitrary information in a bitcoin transaction. For example, look at the message section https://chain.so/tx/BTC/

You can do that today: it is possible to embed arbitrary information in a bitcoin transaction. For example, look at the message section https://chain.so/tx/BTC/27daac15b942454b32f913a41633151163d1921b0c7bf6ddbea6020462d805ee https://chain.so/tx/BTC/27daac15b942454b32f913a41633151163d1... I don't know of any situation where someone has used this to dox someone, but nothing prevents it.