AlmondBlossom media server for Nostr

Blob storage on your filesystem or S3 bucket. No database, no user accounts — just Nostr signatures. Keep files permanently or enable automatic expiration. Cache blobs from other Blossom servers.

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Configuration

Rust library

GitHub

🌸

Blossom API

Upload (including resumable chunked uploads), download, mirror, list, delete and report. Implements BUD-01, BUD-02, BUD-04, BUD-06, BUD-07, BUD-09, BUD-11 and BUD-12.

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Database-free storage

Files on disk or in an S3-compatible bucket, no database or user accounts. Optional age limits, size and count caps, and oldest-first eviction.

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Nostr access control

Every write endpoint is off, public, wot (web of trust) or dvm, plus an optional npub allowlist. Optional Cashu payments per operation.

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Upstream caching

Blobs missing locally are fetched from configured upstream servers or client hints, then proxied, redirected or cached.

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Operations ready

Prometheus metrics, BUD-11 hash filter, report quarantine, static file serving, config editor and built-in TLS.

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Embeddable

A Rust library — merge the Blossom routes into your own Axum 0.8 application and keep your own homepage, auth and shutdown policy.