Limit rewards per IPv4 /24 subnet

[bajtos]

When calculating SPARK rewards, we can see many nodes completing the same task. To make sybil attacks more expensive, we should reward only one checker in each IPv4 /24 subnet.

Tasks

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1. Record "inet_group" in measurements
2. Evaluate inet_group field - reward one participant per group
3. Visualise measurements & evaluations in Grafana

[bajtos]

The grouping algorithm must allow us to identify participants from U.S- or E.U.- sanctioned countries to implement geofencing and ensure we don't pay them.

[patrickwoodhead]

Cloudflare using IPV6 which is slowing things down a bit.

[bajtos]

The grouping algorithm must allow us to identify participants from U.S- or E.U.- sanctioned countries to implement geofencing and ensure we don't pay them.

We decided to implement a different solution: we put Cloudflare's WAF (web application firewall) in front of SPARK API and configured it to reject requests coming from the sanctioned countries.

[bajtos]

Visualisations:

• Winning rate: https://protocollabs.grafana.net/d/c4bd3c80-9360-4ea3-8b75-c5ecea90765b/spark?orgId=1&from=now-6h&to=now&viewPanel=30
• Fraud detection breakdown - no changes were necessary: https://protocollabs.grafana.net/d/c4bd3c80-9360-4ea3-8b75-c5ecea90765b/spark?orgId=1&from=now-6h&to=now&viewPanel=24