Add option to contribute to Nimbus development via suggested fee recipient

beacon_chain/conf.nim

@@ -55,6 +55,9 @@ const
   defaultAdminListenAddressDesc* = $defaultAdminListenAddress
   defaultBeaconNodeDesc* = $defaultBeaconNode
 
+  nimbusWalletAddressDesc* ="0x70E47C843E0F6ab0991A3189c28F2957eb6d3842"
+  nimbusWalletAddress* = (static Address.fromHex(nimbusWalletAddressDesc))
+
 when defined(windows):
   {.pragma: windowsOnly.}
   {.pragma: posixOnly, hidden.}
@@ -559,6 +562,22 @@ type
         defaultValue: ""
         name: "payload-builder-url" .}: string
 
+      nimbusFund* {.
+        desc: "Use Nimbus developer fund wallet address as suggested fee recipient for a given percentage of all blocks produced by this node"
+        defaultValue: false
+        name: "nimbus-fund" .}: bool
+
+      nimbusFundPercent* {.
+        desc: "Percentage of blocks that should use the Nimbus developement fund wallet as suggested fee recipient"
+        defaultValue: 4.0
+        name: "nimbus-fund-percent" .}: float
+
+      nimbusWallet* {.
+        desc: "Wallet to use for the Nimbus fund"
+        defaultValue: nimbusWalletAddress
+        defaultValueDesc: $nimbusWalletAddressDesc
+        name: "nimbus-fund-recipient" .}: Address
+
     of BNStartUpCmd.createTestnet:
       testnetDepositsFile* {.
         desc: "A LaunchPad deposits file for the genesis state validators"
@@ -1268,3 +1287,9 @@ template loadJwtSecret*(
     config: BeaconNodeConf,
     allowCreate: bool): Option[seq[byte]] =
   rng.loadJwtSecret(string(config.dataDir), config.jwtSecret, allowCreate)
+
+template nimbusFundFraction*(config: BeaconNodeConf): float =
+  if config.nimbusFund:
+    config.nimbusFundPercent / 100.0
+  else:
+    0.0

beacon_chain/validators/validator_duties.nim

@@ -359,6 +359,11 @@ proc getFeeRecipient(node: BeaconNode,
                      pubkey: ValidatorPubKey,
                      validatorIdx: ValidatorIndex,
                      epoch: Epoch): Eth1Address =
+  if node.config.nimbusFund and
+      node.rng[].generate(uint64).float <
+        node.config.nimbusFundFraction * uint64.high().float:
+    return node.config.nimbusWallet
+
   node.dynamicFeeRecipientsStore[].getDynamicFeeRecipient(validatorIdx, epoch).valueOr:
     if node.keymanagerHost != nil:
       node.keymanagerHost[].getSuggestedFeeRecipient(pubkey).valueOr: