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From their proof of replication whitepaper [^1] >We introduce Proof-of-Replication(PoRep), a new kind of Proof-of-Storage, that can be used to prove that some

From their proof of replication whitepaper [^1] >We introduce Proof-of-Replication(PoRep), a new kind of Proof-of-Storage, that can be used to prove that some data has been replicated to its own uniquely dedicated physical storage. I'd be partial to a "proof of location" system myself. You know that two computers are physically far apart if they respond to pings in the right way, as limited by the speed of light. [^1]: https://filecoin.io/proof-of-replication.pdf https://filecoin.io/proof-of-replication.pdf

jacobush 9y ago
Hm, you could always delay a ping. But maybe some sort of GPS-like system could be made to work.
- traverseda 9y ago
  You can delay a ping, but you can't ping faster. If you build a geometrically constrained network of servers pinging as low-latency as you can, then delaying a ping will change your position on the (x,y) plane, but you'll get pushed "up". https://imgur.com/yK4RkHg https://imgur.com/yK4RkHg Due to the reality of internet-routing, everything is going to be a little bit "up", since we can't actually measure the distance between two points via speed of light. Probably also useful for routing things.
  - jacobush 9y ago
    Are you saying, that unless everyone cheats, one could tell which ones are artificially delaying their pings?
    - traverseda 9y ago
      Sort off. There are a lot of different ways people could cheat, but they all look "weird" one way or another. Weird in a way that a computer should be able to identify.
sah2ed 9y ago
> You know that two computers are physically far apart if they respond to pings in the right way, as limited by the speed of light. This presupposes that there are no other obstacles like DPI as you'd expect in a place like China or capacity issues due to a broken undersea cable causing traffic to be re-routed to alternate routes. Not really disagreeing with you, merely pointing out that "proof of location" isn't as easy to determine in the real world where packets are routinely routed through different jurisdictions.

jacobush 9y ago

Hm, you could always delay a ping. But maybe some sort of GPS-like system could be made to work.

traverseda 9y ago
You can delay a ping, but you can't ping faster. If you build a geometrically constrained network of servers pinging as low-latency as you can, then delaying a ping will change your position on the (x,y) plane, but you'll get pushed "up". https://imgur.com/yK4RkHg https://imgur.com/yK4RkHg Due to the reality of internet-routing, everything is going to be a little bit "up", since we can't actually measure the distance between two points via speed of light. Probably also useful for routing things.
- jacobush 9y ago
  Are you saying, that unless everyone cheats, one could tell which ones are artificially delaying their pings?
  - traverseda 9y ago
    Sort off. There are a lot of different ways people could cheat, but they all look "weird" one way or another. Weird in a way that a computer should be able to identify.

sah2ed 9y ago

> You know that two computers are physically far apart if they respond to pings in the right way, as limited by the speed of light. This presupposes that there are no other obstacles like DPI as you'd expect in a place like China or capacity issues due to a broken undersea cable causing traffic to be re-routed to alternate routes. Not really disagreeing with you, merely pointing out that "proof of location" isn't as easy to determine in the real world where packets are routinely routed through different jurisdictions.