hash_accepted, but why?
This has confused me for a while, would be grateful if someone here can shed some light:

I am testing the miner on a slow machine with heavy throttle, the average hash rate is around 4H/S. My proxy connects to a pool that has a difficulty of 2000. So it takes about 8 mins to complete a job. 

From my understanding, the Monero blockchain creates a new block every 2 mins, every job is a challenge unique to the block, the result acts as a lottery ticket to claim the block. So at the time my miner completes the job, the block has been created/claimed long time ago, the result I submit to the pool should be invalid.

However, on the contrary, my submission consistently got accepted by the pool.

Here is the screenshot.
![screenshot](https://user-images.githubusercontent.com/3734135/34365028-96b62358-ea40-11e7-9a81-06da01807da0.jpg)

My miner received 3 jobs, it took ~8 mins to complete 2000 hashes, it submitted the job use the last job_id, and got accepted.

What was going on? or it is just me misunderstand the problem?


