We presented Harp Nextcloud, a practical extension that brings decentralized metadata reconciliation and verifiable integrity to the Nextcloud ecosystem. Our prototype demonstrates significant reductions in sync conflicts and recovery time, with modest overhead. Future work includes:
By enabling P2P data transfer, you preserve the governance of Nextcloud while unlocking the raw speed of decentralized networks. Your users won’t notice the difference in the UI—but they will notice that their 50GB file now downloads in minutes instead of hours.
| Metric | Standard Nextcloud | Harp Nextcloud | Improvement | |--------|--------------------|----------------|--------------| | Sync conflicts (per 1000 operations) | 142 | 18 | -87% | | Time to reach consistency after partition (seconds, median) | 47.2 | 8.4 | -82% | | Storage overhead per file (metadata) | 512 bytes | 684 bytes | +34% | | GET latency (ms, p95) | 210 | 226 | +7.6% | | PUT latency (ms, p95) | 850 | 918 | +8.0% |
This shift is profound. It changes the internet from a series of centralized hubs (spokes) into a true decentralized network. In a Nextcloud world, your data lives in your home, or in a data center you contract with directly, encrypted with keys that only you possess. The software acts as a bridge between the complexity of server administration and the usability of a modern web interface. It makes the harp playable without requiring the musician to be a master carpenter.
It routes client requests directly to these containers, bypassing the Nextcloud PHP stack entirely for improved efficiency. Key Benefits of HaRP over Docker Socket Proxy (DSP)
Setting up HaRP is crucial for users managing external apps, particularly those using Nextcloud All-in-One (AIO). 1. Prerequisites A running Nextcloud instance . AppAPI installed and enabled. Docker installed. 2. Launching the HaRP Container You can run HaRP alongside your existing Docker setup.
Restart the container stack to allow the system to create the nextcloud-aio-harp infrastructure automatically. 2. Standard Docker-Compose (Same Host)
The first piece of the file arrives in 0.5 seconds with Harp (WebRTC) vs 3 seconds with WebDAV (TCP handshake + TLS).
"Echo just found a match! The tune is a variant of 'La Llorona' from Veracruz. Linking the nodes… done. It's a migration song, not a lament."
Her heart pounded. She was looking at a live node. She opened the chat.
Have you deployed Harp with Nextcloud? Share your experiences in the comments below.
Fill in the HP_SHARED_KEY and NC_INSTANCE_URL as defined in your Docker run command. Common Issues and Troubleshooting (2026 Context)