Yes it does, i tried to start an account, you want my bitcoin signature.. come on man!

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We’re a non-custodial service, so your Bitcoin stays yours, we don’t hold it. The signature proves you own the address and helps to prevent scams. Lots of small UTXOs can lead to higher transaction fees in the future when combining them for spending.

https://www.youtube.com/watch?v=UWCw8s6cZO0