Why to NOT use old bitcoin addresses?

[GCInc.]

Another simple question, WHY is it recommended to use a new bitcoin address for different purposes, or even for every transaction? Is there some technological reason behind that, as it would be much clearer to use a single payment address to identify your "bitcoin account" to make it more like the old ways for transferring money that people are used to?

Thank you

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[spruce]

It helps with anonymity. You can promote a single receive address if you want — Wikileaks does.

[hsf_context]

So it'll be hard for people to track how much bitcoins you have. Besides, the idea is anonymity.

[GCInc.]

Are there any risks for sender anonymity making repeated transfers if the receiver is using a static bitcoin address?

[DrHaribo]

If two people owe you 10 BTC each, and you give them separate addresses to use when paying, it's easy to tell who it was if only one of them payed.

If you only ever use the same address you just see 10 BTC arrived.

[OmegaNemesis28]

If two people owe you 10 BTC each, and you give them separate addresses to use when paying, it's easy to tell who it was if only one of them payed.

If you only ever use the same address you just see 10 BTC arrived.

I hadn't thought of it like that even after reading all the different scenarios. Nice!

[Weaver]

Or you could just tell one person to send 10.0012 and the other to send 10.0013 btc

[cAPSLOCK]

Two addresses is easier and more foolproof.