Nostr as a Foundation for Social Media

Sound identity layer. Unproven as social media.

Nostr is a deliberately minimal, open protocol that replaces platform-owned accounts with cryptographic keypairs and platform servers with simple, untrusted relays — a design that genuinely solves account portability and censorship-resistance at the identity layer in a way Mastodon's federation does not.¹²⁸

But solving identity did not solve social media. Independent measurement shows traffic and hosting concentrating heavily despite nominal decentralization,⁵ and practitioners and critics converge on a consistent set of unsolved problems: relay economics, content discovery, moderation/spam, and key-management UX.⁵⁶ Adoption peaked early and has since plateaued — Nostr never crossed 100,000 weekly active users in any week of 2025, and growth has flatlined or declined, conceded even by advocates.¹³¹⁴ The verdict: a technically sound identity-and-transport protocol with a real but small, stagnant user base. [ ok ]

Architecture: keys, events, relays.

The protocol's single data structure is the Event — a JSON object with fields id, pubkey, created_at, kind, tags, content, and sig, where id is a SHA-256 of the serialized event and sig is a Schnorr signature over secp256k1.¹ Users are identified not by usernames but by public keys (surfaced as npub…); every post is signed client-side, so any client can verify authenticity regardless of which server delivered it.¹⁴

Servers — relays — are intentionally minimal. Clients publish with ["EVENT", …] and subscribe with ["REQ", …], receiving stored events then an ["EOSE"] marker and live events.¹ The protocol is extended through NIPs (Nostr Implementation Possibilities) and is public domain.³⁴

“A relay is very simple and dumb. It does nothing besides accepting posts from some people and forwarding to others… Relays don't have to be trusted.”

— fiatjaf, protocol creator [2]

The design thesis.

Creator fiatjaf, a pseudonymous Brazilian developer, first wrote Nostr in 2020 in reaction to perceived moderation problems on Twitter, naming it "Notes and Other Stuff Transmitted by Relays."⁴ His stated goal: "the simplest open protocol that is able to create a censorship-resistant global 'social' network."²³ His rejection of federation is explicit — in federated systems "user identities are attached to domain names controlled by third-parties," "server owners can ban you, just like Twitter," and "migration between servers is an afterthought."²

Bias note: this entire "better than Mastodon" framing traces to a single origin — the creator — and is presented here as his argument, not neutral fact.

Nostr vs. ActivityPub vs. AT-Protocol.

The three leading decentralized-social protocols differ most at the identity and portability layer.⁸⁹

The trade-off is real and runs both ways: Nostr's keypair model removes the server's power over your identity, but pushes the hard problems — discovery, moderation, spam — out of the protocol and onto clients and relays.⁴⁶

Zaps and funding.

Nostr integrates Bitcoin Lightning Network micropayments called "Zaps" via NIPs.⁴ single-source

The ecosystem is heavily funded by Jack Dorsey through his #startsmall initiative and the non-profit OpenSats — but exact figures conflict across sources. OpenSats-linked reporting describes a $10M grant (2023) and a $21M grant (Dec 2024) including a $5M dedicated Nostr Fund;⁷ other reporting describes a "~$250,000 in Bitcoin" donation and a separate "$10M" tranche.⁴ contested These conflate distinct donations, so no single "Dorsey gave Nostr $X" figure should be stated as settled. Edward Snowden and Dorsey have both publicly endorsed the protocol.⁴

Peaked early, then plateaued.

The strongest longitudinal baseline is the 2023 academic measurement: 17.8M posts across 712 relays, but only ~1.5M unique users (Jul–Dec 2023).⁵ That sits against a frequently-cited "over 18 million users by May 2023" claim⁴ — reconcilable only if the larger number counts cumulative keypairs created rather than active participants, so the "18M users" figure is misleading and not repeated here as adoption. contested

Since then, growth has stalled. A neutral prediction market tracking the canonical stats.nostr.band "weekly active users" metric resolved NO — Nostr did not reach 100,000 weekly active users in any week of 2025.¹³ A late-2025 sample put active writers at ~80,000 pubkeys,¹⁵ and even prominent advocates concede the trend.

“Activity on Nostr has not only flatlined, but may have even declined… stuck at the same level it was 12 months ago.”

— Aleksandar Svetski, CEO of Satlantis & Nostr advocate [14] · source-against-interest

On the network's structure, the academic study found that — despite decentralization in principle — the top relay hosted 73% of posts, posts were replicated to an average of 34.6 relays, 98.2% of download traffic was redundant, and 20% of relays were down >40% of the window — while availability stayed "around 90% even after the top 50 relays… are removed."⁵ Greater decentralization than the Fediverse, at heavy replication cost.

What the protocol doesn't solve.

The most substantive critique comes from Bryan Ramos, a systems engineer who endorsed Nostr in 2023 and retracted by 2025.⁶ His arguments — attributed opinion, but corroborated in part by the measurement data:

• Relay economics are unsolved: "Relays that charged enough to be sustainable were too expensive for casual users. Free relays became spam sinks."⁶
• Discovery is structurally broken: "Finding interesting people outside the dominant cluster requires already knowing who they are. The protocol has no answer for this."⁶
• The censorship-resistance promise narrowed: "no censorship of the specific things the dominant community wanted to say."⁶
• Key-management UX is a hard barrier: "Lose your key, lose your identity."⁶

On spam and moderation, frictionless account creation enables spam, and bridges have routed Nostr posts through ActivityPub to spam Bluesky.⁴ single-source From the fediverse camp, the critique is consistent across two independent voices: Nostr is seen as a crypto "mono-culture,"¹⁰ and as needless "fragmentation" — Laszlo Fazekas argues ActivityPub should be extended rather than replaced, since its censorship and incentive gaps are "completely solved" by decentralized storage layers, concluding "the future clearly belongs to ActivityPub."¹¹

The honest gaps.

• Dorsey's exact contribution — figures conflict and conflate different donations.⁴⁷ contested
• Precise mid-2026 active-user count — the trend (plateau, sub-100k WAU, flat-to-declining) is firmly sourced,¹³¹⁴¹⁵ but the live stats.nostr.band / nostr.watch dashboards are client-side JS that couldn't be rendered, so the exact current-week number isn't pinned.
• Zaps prevalence, China App-Store removal, bridge-spam — each rests on a single source.⁴ single-source
• Bias clusters: the "Nostr beats federation" case is largely the creator's own framing;² the stall finding leans on advocate concessions + a neutral market — source-against-interest, not an anti-Nostr echo chamber.

The register.

1. NIP-01 — Basic Protocol Flow Primary · protocol authority
2. fiatjaf — nostr.html Primary · creator · not independent of [3]
3. nostr-protocol/nostr README Primary · same origin as [2]
4. Wikipedia — Nostr Tertiary · sole source for several claims
5. Wei & Tyson — An Empirical Analysis of the Nostr Social Network, Proc. ACM on Networking 2025 Primary research · independent
6. Bryan Ramos — Why Nostr Never Took Off Secondary opinion · independent ex-advocate
7. Bitcoin Magazine — OpenSats / #startsmall · crypto.news ($21M) Secondary · figures conflict with [4]
8. Gigazine — AT Protocol vs ActivityPub vs Nostr Secondary · independent
9. Soapbox — Comparing Protocols Secondary · Nostr-adjacent vendor
10. Shellsharks — Nostr vs. Mastodon Secondary opinion · independent
11. Laszlo Fazekas — Decentralized ActivityPub Could Be the Future Secondary · fediverse advocate · corroborates [10]
12. Rost Glukhov — Nostr Overview & Statistics (Oct 2025) Secondary · figures cautioned, not load-bearing
13. Manifold — Will Nostr reach 100k WAU in 2025? (resolved NO) Secondary · neutral market vs. stats.nostr.band · independent
14. Aleksandar Svetski — Beyond the Feed Secondary opinion · advocate · source-against-interest
15. whynostr.org — Biweekly Review (Dec 2024–Jan 2025) Secondary · community, quoting nostr.band