How will you prove you have completed the work?

How will you prove you have completed the work?

When disputing a buyer's claim that you have not completed the work, it helps to provide some type of proof of work. And, this might differ for each specific type of service. For instance, if you are an article writer, your proof is usually the article file uploaded when you submitted your work. For forum posts, you could screenshot your final post (which proves you reached a specific post count) and if later the forum owner rejects the order when completed, you would have proof that you completed the job as requested.

But there are many other types of services provided here, not just those based on writing.

Please suggest other ways to provide proof that you have completed work.

For instance, how would you document that you had provided Facebook fans; Twitter followers or website traffic?

This would not necessarily be proof that you submit to your buyer upon completion of the job, but something you would hold onto for yourself just in case you were required to refute a buyer's contention that you had not completed the job.

Please provide tips so that other sellers here can learn.