What are some uses of a signed crytocurrency message in a product or service or some other useful use of this feature?

What are some uses of a signed crytocurrency message in a product or service or some other useful use of this feature?

A signed message is a way to prove a user owns an address. But what are some useful products or services that have been built around this feature with signing a bitcoin / altcoin message with their private key?

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