Blisk stores Blossom blobs in a local indexed database designed for deduplicated storage.
Open source
24 alternativesBlossom
Blossom specifies HTTP endpoints for storing blobs on media servers using Nostr public and private keys for identity.
About Blossom
Blossom is a specification for HTTP endpoints that allow users to store blobs of data on publicly accessible servers. It uses Nostr public and private keys for user identity, and addresses blobs by their SHA-256 hash.
Additional behavior is defined in Blossom Upgrade Documents (BUDs), which describe features a server may implement, including upload, retrieval, deletion, mirroring, media optimization, and authorization. Capabilities therefore vary by server.
Key features
- Store blobs addressed by SHA-256 hash on public servers
- Identify users with Nostr public and private keys
- Upload blobs via PUT /upload endpoint
- Delete blobs via DELETE / endpoint
- Mirror blobs to other servers via PUT /mirror
- Track user servers with Nostr kind 10063 events
Best for: Developers building Nostr clients or media servers that need to store binary blobs.
Good for
- Public domain specification with open source repository
- Uses existing Nostr keys for user identity
Watch out for
- Additional features depend on which BUDs a server implements
- Blob listing endpoint is marked as unrecommended
Blossom at a glance
- Website
- github.com/hzrd149/blossom
- Category
- Social & Communities › Nostr
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Blossom FAQ
What is Blossom?
A specification for HTTP endpoints that allow users to store blobs of data on publicly accessible servers.
What are blobs?
Packs of binary data addressed by their SHA-256 hash.
What are BUDs?
Short documents that outline an additional feature that a Blossom server may implement.
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