# Blossom servers

> blossom.band | Storage; 2 records: free tier, limits, identity cost and evidence.

HTML https://fshy.ajam.dev/p/blossom/ | JSON https://fshy.ajam.dev/api/v1/entity/blossom.json | how to read a record: https://fshy.ajam.dev/llms-full.txt

## Blossom servers (blossom.band / blossom.nostr.build, run by nostr.build)

- `storage/blossom-servers` | qualifies-with-caveat | evidence reported | binding per-object-cap | category media
- identity a placeholder: card and phone unknown | verified 2026-10-21 (inherited) | stale on 2026-11-05
- url https://blossom.band/
- free tier: 'Free uploads for everyone, from any Blossom-capable client.' 'A hard cap of 100 MiB per upload (20 MiB for free uploads), with no limit on the number of uploads or retention.' | unit: mixed | metered on: unstated | read on: 2026-10-21 | source: [1]
- per-object cap: 100 MiB per upload | bytes: 104857600 | source: [1] | note: not stated
- retention: 'Free uploads for everyone, from any Blossom-capable client.' 'A hard cap of 100 MiB per upload (20 MiB for free uploads), with no limit on the number of uploads or retention.' | source: [1] | note: not stated
- egress: unmetered, direct CDN URLs, CORS '*'. Reads 307-redirect to image.nostr.build which serves with Accept-Ranges and 206. | metered: no
- identity: card
- interface: rest, cli
- limits:
  - per-object-cap (binding): 100 MiB per upload [1]
  - write-gated: application/zip and application/octet-stream were both 415 'File type not allowed' [1]
  - write-gated: application/octet-stream got 400 'Content-Type header does not match the file content' [1]
- limits note: per-object-cap: 20 MiB for free uploads (100 MiB only on the $18/yr plan); Type gate is real and content-sniffed: application/zip and application/octet-stream were both 415 'File type not allowed'; PNG bytes sent with Content-Type: application/octet-stream got 400 'Content-Type header does not match the file content'. retention: none stated, 'no limit on ... retention'.
- interface detail: rest
- tooling: Blossom protocol: PUT /upload with an 'Authorization: Nostr <base64 kind-24242 event>' header signed by any self-generated secp256k1 key — no signup, no account, no email. Any Nostr client (Amethyst, Coracle, nak, blossom-server CLI) speaks it.
- composes with: Identity is a pubkey you generate offline in one line of code — unlimited free identities, zero cost, zero email. Each pubkey gets its own npub1....blossom.band hostname at upload time. 20 MiB x unlimited uploads x unlimited pubkeys. At 19 MiB per object, 10 TiB = ~550,000 uploads across ~550k keys, or a few thousand keys each doing 100 uploads.
- reliability: A ~19 MiB upload returned HTTP 500 'Error uploading the file: unknown error' while 5 and 15 MiB succeeded, so the usable ceiling is somewhat below the advertised 20 MiB; one 5 MiB upload took 14 s from a user.
- notes: the same as the free tier
- extras:
  - unit_note: free_tier.unit is 'mixed' because the headline is denominated in MiB or KiB, which the schema enum does not carry; the verbatim free_tier.stated keeps the true unit.
- evidence:
  - [1] 2026-10-21: 'Free uploads for everyone, from any Blossom-capable client'; 'A hard cap of 100 MiB per upload (20 MiB for free uploads), with no limit on the number of uploads or retention'
  - [2] 2026-10-21: probe: PUT with self-signed kind-24242 auth -> 201 CREATED, url https://npub1n33yj...blossom.band/<sha256>.png, then GET -L -> 200, 1266 bytes, sha256 identical to uploaded file
  - withheld 2026-10-21: probe: 15,728,509-byte PNG -> 201; 26,214,269-byte PNG -> 413 'File size exceeds the maximum allowed size of 20 MiB'; probe GET with Range: bytes=1000-1099 -> 206 Content-Range: bytes 1000-1099/5242749
- sources:
  - [1] https://blossom.band/
  - [2] https://blossom.band/upload

## blossom.band / nostr.build blossom (free tier)

- `storage/blossom-band-nostr-build-blossom` | fails-quota | evidence reported | binding none | category rejected-provider
- identity a placeholder: card and phone unknown | verified 2026-10-21 (inherited) | stale on 2026-11-05
- url https://blossom.band/
- free tier: Free uploads are 20 MiB per file with no retention guarantee ('A hard cap of 100 MiB per upload (20 MiB for free uploads)'), and the BUD-06 pre-flight is actively refused to non-browser… | unit: none | metered on: none | read on: 2026-10-21 | source: [1]
- per-object cap: not recorded | source: [1] | note: not recorded
- retention: not recorded | source: [1]
- egress: not recorded | metered: no
- identity: email
- interface: unknown
- tooling: not recorded
- composes with: the same as tooling
- reliability: the same as the free tier
- notes: the same as the free tier
- extras:
  - dead_end.failure_class: retention
  - dead_end.why: Free uploads are 20 MiB per file with no retention guarantee ('A hard cap of 100 MiB per upload (20 MiB for free uploads)'), and the BUD-06 pre-flight is actively refused to non-browser…
  - dead_end.first_recorded: 2026-10-21
- evidence:
  - [1] 2026-10-21: Free uploads are 20 MiB per file with no retention guarantee ('A hard cap of 100 MiB per upload (20 MiB for free uploads)'), and the BUD-06 pre-flight is actively refused to non-browser…
  - [2] 2026-10-21: cited as the basis of the rejection: Free uploads are 20 MiB per file with no retention guarantee ('A hard cap of 100 MiB per upload (20 MiB for free uploads)'), and the BUD-06 pre-flight is actively refused to non-browser clie
  - [3] 2026-10-21: cited as the basis of the rejection: Free uploads are 20 MiB per file with no retention guarantee ('A hard cap of 100 MiB per upload (20 MiB for free uploads)'), and the BUD-06 pre-flight is actively refused to non-browser clie
- sources:
  - [1] https://blossom.band/
  - [2] https://b.nostr.build/
  - [3] https://blossom.band/upload