user90142: I was reading about the Sheep Marketplace:

Victims of the theft have attempted to identify the thief by sending "tagged" bitcoins to his accounts, using the public nature of bitcoin transactions to follow these moneys through the "blockchain" record of transfers.

What are "tagged" Bitcoins and how do they work? How do they differ from regular Bitcoins?

user-1: 
Source: https://www.theguardian.com/technology/2013/dec/09/recovering-stolen-bitcoin-sheep-marketplace-trading-digital-currency-money
I think it just means that some users discovered this address: 1Eg8WSxvfeZaKmqhNZrECTUb58x3y1AWYN and maybe few others involved in their past transactions to the darknet market. They tried to send small amounts to these addresses hoping they could track when its moved.

90142: <p>I was reading about the <a href="https://en.wikipedia.org/wiki/Sheep_Marketplace" rel="nofollow noreferrer">Sheep Marketplace</a>:</p>
<blockquote>
<p>Victims of the theft have attempted to identify the thief by sending <strong>&quot;tagged&quot; bitcoins</strong> to his accounts, using the public nature of bitcoin transactions to follow these moneys through the &quot;blockchain&quot; record of transfers.</p>
</blockquote>
<p>What are &quot;tagged&quot; Bitcoins and how do they work? How do they differ from regular Bitcoins?</p>
 -1: <p><a href="https://i.stack.imgur.com/u4xPZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/u4xPZ.png" alt="news-screenshot" /></a></p>
<p>Source: <a href="https://www.theguardian.com/technology/2013/dec/09/recovering-stolen-bitcoin-sheep-marketplace-trading-digital-currency-money" rel="nofollow noreferrer">https://www.theguardian.com/technology/2013/dec/09/recovering-stolen-bitcoin-sheep-marketplace-trading-digital-currency-money</a></p>
<p>I think it just means that some users discovered this address: <code>1Eg8WSxvfeZaKmqhNZrECTUb58x3y1AWYN</code> and maybe few others involved in their past transactions to the darknet market. They tried to send small amounts to these addresses hoping they could track when its moved.</p>
