How can I tell if I've won a block?

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1

I am running a farmer and would like to know how I can tell if i have won a block or not?

2

You will want to check your reward address on the Subspace/Substrate explorer.

If you have not yet setup your account on the polkadot.js extension refer to this post

3

Another way is to check the log of your farmer, if log says “successfully signed a block” then you won it.

4

Almost. You might need to check node’s logs for re-orgs as well, it is possible that farmer signed the block, but block was pruned as part of non-canonical chain, see Сoin disappeared from wallet balance - #2 by Diana_Subspace