⭐ Merited by BenCodie (2)
It's gratifying to know that someone is interested in the technical details we describe in our texts 
This is a simple but crucial part of security.
From our "tests" we haven't found any project that has thought about this feature.
Probably, this feature isn't implemented due to specific 'technical challenges,' like using addresses from different wallets at the same time when creating transactions.
However, we've fully implemented this feature.
In short, we regularly switch wallets.
Everything happens automatically. For example, today deposit addresses come from wallet1, and change also goes to wallet1. Tomorrow, deposit addresses come from wallet2, and change also goes to wallet2. When all addresses from wallet1 are used, we remove that wallet.
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Is this talking just about the website/database, or does this claim also extend to the Bitcoin node(s) being used to run the service? As deleting individual addresses from the wallet.dat in the Bitcoin node has been reported to be not possible on a command-line/operational level, you would need to delete the wallet every time and restart the node, which would be seemingly infeasible for a mixer/tumbler to achieve as this would cause constant node disruption...Unless tumbler.io can additionally claim to have also created a way to create/delete wallets automatically within the node without disrupting system operation?
This is a simple but crucial part of security.
From our "tests" we haven't found any project that has thought about this feature.
Probably, this feature isn't implemented due to specific 'technical challenges,' like using addresses from different wallets at the same time when creating transactions.
However, we've fully implemented this feature.
In short, we regularly switch wallets.
Everything happens automatically. For example, today deposit addresses come from wallet1, and change also goes to wallet1. Tomorrow, deposit addresses come from wallet2, and change also goes to wallet2. When all addresses from wallet1 are used, we remove that wallet.