http://ttevhjjsjxz6uqqcjkbig5cycd7n7xv7cmd6f5fcvrqaaa7f3bj36wad.onion/technology/security/pow/index.html
Then, introduction
requests with higher priority are processed first, while low-priority ones are
delayed and may even timeout, requiring that the client to try again. If the rendezvous request times out, the client SHOULD fetch a new descriptor
for the service to make sure that it's using the right suggested-effort for the
PoW and the right PoW seed. If the fetched descriptor includes a new suggested
effort or seed, it should first retry the request with these parameters....