If you share a Bitcoin address corresponding to a specific unspent transaction output (UTXO), it can indeed be relatively straightforward for someone to trace the transaction history using blockchain analysis tools. The Bitcoin blockchain is a public ledger, so the movement of funds is transparent.

What They Can See

	1.	Source of the UTXO: The person can see which address (or addresses) the UTXO was previously associated with, meaning they can track back to see where the funds came from.
	2.	Change Address: If you spend the UTXO, the transaction will typically have two outputs: one to the recipient and one for the “change” that is returned to a new address you control. An observer can often deduce which output is the change, especially if:
	•	The amount sent to the recipient is rounded, while the change amount looks more random.
	•	Your change addresses follow a similar pattern or are clustered in a way that suggests they belong to the same wallet.

Blockchain Analysis

Sophisticated blockchain analysis firms and tools can use heuristics to make these links more reliable. Although it’s not “trivial” to deanonymize completely without additional data, the transparency of the blockchain makes it feasible to infer a lot about transaction patterns.

Improving Privacy

	1.	Use CoinJoin: Mixing services like CoinJoin can help obfuscate transaction history.
	2.	Separate Addresses: Using a new address for each transaction increases privacy.
	3.	Avoid Address Reuse: This helps prevent easy tracking of funds.

Privacy on Bitcoin is pseudonymous but not fully anonymous, so extra care is needed if privacy is a significant concern. 

 Thank you! Tried zapping but says ‘error fetching invoice’ 

 Hmmm no worries