Blossom servers
blossom.band · 2 records in Storage · JSON
Records 2
- caveatBlossom servers (blossom.band / blossom.nostr.build, run by nostr.build)
Storagefree tieridentity card?card?limit per-object-capevidence reportedstale on 2026-11-05
- fails: quotablossom.band / nostr.build blossom (free tier)
Storageidentity email?card?evidence reportedstale on 2026-11-05
- Free allowance
- '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.'
- Verdict
- caveatusable, with a named limit or an unprobed read path
- Cost
- free tier
- Identity
- card?placeholder, not evidence; card unknown, phone unknown
- Binding limit
- per-object-cap100 MiB per upload
- Evidence
- reported3 sources; a third party said so
- Freshness
- stale on 2026-11-05checked 2026-10-21 (inherited); stale on 2026-11-05
| 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 |
|---|---|
| Price | none stated |
| Limits |
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'. |
| Identity | card (inferred, not read) not published |
| Egress | unmetered, direct CDN URLs, CORS '*'. Reads 307-redirect to image.nostr.build which serves with Accept-Ranges and 206. |
| Per-object cap | 100 MiB per upload (104857600 bytes) |
| 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.' |
| Interface | rest, cli 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. |
| Parsed numbers |
|
Evidence 3
| date | source | what it proved |
|---|---|---|
| 2026-10-21 | blossom.band/ | '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' |
| 2026-10-21 | blossom.band/upload | 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 |
| 2026-10-21 | source not published | 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 |
More fields 1
| 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. |
|---|
Unknown values 2
- per object cap notes: the field may be stated in a source that was not read
- retention notes: the field may be stated in a source that was not read
- Free allowance
- 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…
- Verdict
- fails: quotathe free allowance is too small to matter
- Cost
- not stated
- Identity
- email?placeholder, not evidence; card unknown, phone unknown
- Binding limit
- noneno named constraint binds
- Evidence
- reported3 sources; a third party said so
- Freshness
- stale on 2026-11-05checked 2026-10-21 (inherited); stale on 2026-11-05
| 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 |
|---|---|
| Price | none stated |
| Identity | email (placeholder) not published |
| Egress | not recorded |
| Interface | unknown |
| Tooling | not recorded |
Evidence 3
| date | source | what it proved |
|---|---|---|
| 2026-10-21 | blossom.band/ | the text of Free tier, above |
| 2026-10-21 | b.nostr.build/ | 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 |
| 2026-10-21 | blossom.band/upload | 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 |
More fields 1
| dead end | {"failure_class": "retention","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…","retry_when": null,"first_recorded": "2026-10-21"} |
|---|
Unknown values 7
- chaining: no value was recorded for this field
- egress terms: no value was recorded for this field
- interface: the access interface was not established
- per object cap notes: no value was recorded for this field
- per object cap stated: no value was recorded for this field
- retention stated: no value was recorded for this field
- tooling: no value was recorded for this field