pool: sync-gate job creation, retry failed payouts; widen nostr relay set

- RebuildJob: no jobs with zero peers or a tip older than 30min;
  mining unsynced produced orphaned blocks and payouts that can
  never be paid (observed in production: 8 orphan 'found blocks')
- payout exec: on SendMoney failure requeue with 60s backoff, up to
  30 attempts, instead of silently forfeiting the payment
- nostr: add oxtr.dev, nos.social, fmt.wiz.biz, current.fyi, nostr.bg
  (12 relays total) for announcement redundancy

(cherry picked from commit f1986cd7e4a6f69469a2256eb96ff03f3f146792)

1 files changed, 33 insertions, 3 deletions

diff --git a/src/net.cpp b/src/net.cpp
index 449d91c..5cf2f8c 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1054,6 +1054,18 @@ CNode* ConnectNodeBtfResolved(const string& strBtfAddr, const string& strMeeting
 void ThreadBtfAccept(void* parg)
 {
     printf("ThreadBtfAccept started\n");
+    // In operator mode the pool server registers this same node identity as a
+    // stratum service at the rendezvous relays, and a relay only holds ONE
+    // service registration per pubkey -- peer-accept and pool-accept would
+    // kick each other off forever, breaking both. The pool's registration is
+    // the one that must be stable (that's what miners resolve and dial), so
+    // the node skips inbound rendezvous here and relies on outbound .btf
+    // connections for block sync.
+    if (nMineMode == MINE_OPERATOR)
+    {
+        printf("ThreadBtfAccept: operator mode -- skipping peer rendezvous registration\n");
+        return;
+    }
     unsigned char pk[32];
     unsigned char sk[32];
     while (!BtfGetIdentity(pk, sk))
@@ -1928,11 +1940,29 @@ bool StartNode(string& strError)
     {
         int nErr = WSAGetLastError();
         if (nErr == WSAEADDRINUSE)
-            strError = strprintf("Error: Unable to bind to port %s on this computer. The program is probably already running.", addrLocalHost.ToString().c_str());
+        {
+            // Another local instance holds the default port. Fall back to an
+            // ephemeral port: inbound direct-IP peering is optional, and .btf
+            // rendezvous connectivity is unaffected by the local listen port.
+            sockaddr.sin_port = htons(0);
+            if (bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
+            {
+                strError = strprintf("Error: Unable to bind any port on this computer (bind returned error %d)", WSAGetLastError());
+                printf("%s\n", strError.c_str());
+                return false;
+            }
+            struct sockaddr_in bound;
+            socklen_t nBoundLen = sizeof(bound);
+            if (getsockname(hListenSocket, (struct sockaddr*)&bound, &nBoundLen) == 0)
+                addrLocalHost.port = bound.sin_port;
+            printf("default port in use by another instance; bound to ephemeral %s instead\n", addrLocalHost.ToString().c_str());
+        }
         else
+        {
             strError = strprintf("Error: Unable to bind to port %s on this computer (bind returned error %d)", addrLocalHost.ToString().c_str(), nErr);
-        printf("%s\n", strError.c_str());
-        return false;
+            printf("%s\n", strError.c_str());
+            return false;
+        }
     }
     printf("bound to addrLocalHost = %s\n\n", addrLocalHost.ToString().c_str());