✨ Use original filename with prefix as output filename

[williamchong]

Hacky way to solve #10

[edmondyu]

It seems to miss one important and related issue. If the purpose of this change is for supporting concurrent processes, the processes must be run with different wallet address or else code 32 error will occur.
Differentiating the output filenames cannot solve the problem completely, but yet is an improvement for better readability.

[williamchong]

Your issue is too specific then, I dont think this can work without major restructuring
A very simple hack would be just copy and paste many instance of this repo with different config
And to step even further back, if the problem you concern is the speed of upload, we dont event need multiple instances, we just need non-blocking sync broadcast with result callback
So I guess when opening an issue you dont want to go too specific into technical details, if you just have a issue with a story in mind