Willow is a protocol for peer-to-peer data stores that offers several unique features. It allows for fine-grained permissions and prioritizes privacy, ensuring that other users cannot access your data unless they already have knowledge of it and are able to decrypt it. One interesting aspect is the total erasure of data, using prefix pruning to delete entries and their metadata. Fine-grained capabilities allow for restriction of read and write access based on meaningful ranges of data or time. Partial sync allows for selective replication of data to specific devices, and destructive edits overwrite old values and associated metadata. Willow is versatile, allowing users to choose their preferred transport and cryptographic methods. Concurrent writing from multiple devices is also supported.
https://willowprotocol.org/