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I'm creating a tipping type app where I issue unique monero private keys for all my users like how an exchange has a different monero address for each user. I'm sure they are just using a payment id for each user while all funds goto the same wallet.

But in my case, I'm not using a payment ID. How can I sweep all coins from these addresses to my own without a rescan of the blockchain for each address? FYI, I also have a copy of the private keys for my users.

  • Scanning for an updated balance takes awhile. Can this be skipped?
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To be able to make a transaction, the wallet must know how much it contains.

The approach for you would be to only scan from when the user made the transaction by specifying a restore height or date. Allowing you to only scan i.e. the last 10 blocks.

This technique only works if you are sure that each user only used an address from a specific moment. You can couple it with a remote node to allow multiple scans from multiple wallets without being bothered by the download speed.

However, I still would advise you to really consider the option of a single address as this entire process becomes automated.

Keep yourself informed you still use separated addresses as sub-addresses may be useful for your case once these become a thing.

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  • My setup is generating a unique address for each user where they control the private keys. So having just 1 private key I control isn't going to work even if I issue a payment id for each user. My app involves working with a "shared" private key.
    – Patoshi パトシ ♦
    Commented Jan 6, 2018 at 19:06

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