🌸 Blossom - Blobs stored simply on mediaservers

Blossom uses nostr public / private keys for identities. Users are expected to sign authorization events to prove their identity when interacting with servers

What is it?

Blossom is a specification for a set of HTTP endpoints that allow users to store blobs of data on publicly accessible servers

What are blobs

Blobs are packs of binary data addressed by their sha256 hash

Protocol specification (BUDs)

BUDs or Blossom Upgrade Documents are short documents that outline an additional feature that a blossom server may implement.

BUDs

• BUD-00: Blossom Upgrade Documents
• BUD-01: Server requirements and blob retrieval
• BUD-02: Blob upload and management
• BUD-03: User Server List
• BUD-04: Mirroring blobs
• BUD-05: Media optimization
• BUD-06: Upload requirements
• BUD-08: Nostr File Metadata Tags
• BUD-09: Blob Report

Endpoints

Blossom Servers expose a few endpoints for managing blobs

• GET /<sha256> (optional file .ext) BUD-01
• HEAD /<sha256> (optional file .ext) BUD-01
• PUT /upload BUD-02
  • Authentication: Signed nostr event
  • Return a blob descriptor
• HEAD /upload BUD-06
• GET /list/<pubkey> BUD-02
  • Returns an array of blob descriptors
  • Authentication (optional): Signed nostr event
• DELETE /<sha256> BUD-02
  • Authentication: Signed nostr event
• PUT /mirror BUD-04
  • Authentication: Signed nostr event
• HEAD /media BUD-05
• PUT /media BUD-05
  • Authentication: Signed nostr event
• PUT /report BUD-09

Event kinds

kind	description	BUD
24242	Authorization event	01
10063	User Server List	03

License

Public domain.