Azzamo Blossom¶

Azzamo Blossom is a media hosting service for the Nostr ecosystem.

It provides reliable storage and delivery for images, video, and audio using open standards and content-addressed identifiers.

Blossom is designed to integrate seamlessly with Nostr clients while avoiding proprietary lock-in.

Purpose¶

Media is essential for modern communication on Nostr, but hosting large files directly on relays is inefficient and unreliable.

Azzamo Blossom exists to:

Provide stable media storage for Nostr users
Reduce load on relays
Enable fast global delivery of media
Preserve content integrity through cryptographic identifiers

It separates media hosting from event distribution in a clean and scalable way.

What Blossom provides¶

With Azzamo Blossom, users can:

Upload images, video, and audio
Reference media in Nostr events
Serve media through a global CDN
Verify file integrity using SHA256 hashes
Manage storage through clear quotas

Blossom acts as a neutral storage layer rather than a content platform.

Standards and compatibility¶

Azzamo Blossom follows established Nostr and Blossom specifications.

This includes support for:

NIP-96 media uploads
Blossom Upload Drafts (BUDs)
Content-addressed URLs
Standard HTTP delivery

This ensures compatibility with existing and future Nostr clients.

Content-addressed storage¶

All media stored on Blossom is content-addressed.

Files are identified by their SHA256 hash
Identical files share the same identifier
Integrity can be verified independently

This prevents silent modification and enables long-term verifiability.

Upload and access model¶

Uploads¶

Media uploads require active premium access.

Uploads are authenticated via Nostr
Files are validated before storage
Duplicate uploads are deduplicated

Uploads are typically performed through compatible clients.

Access¶

Stored media is publicly readable.

Anyone can fetch media by URL
No login is required for viewing
CDN endpoints are used for performance

Access is optimized for reliability and speed.

Storage and quotas¶

Blossom uses quota-based storage limits.

Each user has a defined storage allocation
Usage is tracked per public key
Additional storage may be purchased

Exceeding limits restricts new uploads until space is freed or upgraded.

Retention and deletion¶

Media retention follows defined rules.

Users may delete their own uploads
Expired or downgraded accounts may lose storage eligibility
Orphaned or abandoned data may be cleaned up

Deletion and retention behavior is documented separately.

Performance and delivery¶

Azzamo Blossom uses distributed storage and CDN caching.

This provides:

Low-latency global access
High availability
Automatic scaling under load

CDN usage is transparent and does not alter content hashes.

Security and abuse prevention¶

Blossom applies safeguards to protect infrastructure.

This includes:

Upload validation
Size and format limits
Rate limiting
Malware and abuse detection

These measures focus on protecting service stability, not moderating content.

What Blossom is not¶

To set expectations clearly:

Blossom is not a social network
Blossom does not curate content
Blossom does not guarantee permanent hosting
Blossom is not a general-purpose file host

It is a Nostr-focused media layer.

When to use Blossom¶

Azzamo Blossom is a good fit if you:

Publish media on Nostr regularly
Want reliable hosting
Need verifiable file integrity
Prefer open standards over proprietary storage

For occasional images, some users may rely on external hosts instead.

Uploading media
Supported NIPs and BUDs
Storage and quotas
CDN and performance
Deletion and retention