What builders shipped on Arkiv at hackathons and challenges. Browse by use case, see which Arkiv primitive each one proves — and replicate the ideas.
Where to start
CLI scaffolder that generates 5 ready-to-run Next.js starter apps, each demonstrating a different Arkiv primitive (CRUD, TTL, queries, subscriptions, attributes).
Replicate this → Ship a `create-X-app` CLI with one template per core primitive — the fastest onboarding path for any new SDK.
Wallet-owned p2p mentorship network: profiles, asks, offers, and session booking stored as Arkiv entities with TTL-aware UX.
Replicate this → Tie TTL to real-world event duration — sessions expire when they end, making on-chain cleanup automatic and semantically correct.
Bluetooth mesh relay that hops encrypted payloads device-to-device until a beacon can publish them to Arkiv as tamper-proof, queryable entities.
Replicate this → PBKDF2-derive a per-device Arkiv wallet from device pubkey + server salt — each field device self-funds without sharing keys.
Browse the catalog
104 projects
Anonymous ZK social platform — post, vote, and form communities without revealing identity, with group metadata stored and queried via Arkiv.
Replicate this → Use Arkiv subscribeEntityEvents to stream new ZK-verified posts in real-time without polling or a centralized relay.
CLI scaffolder that generates 5 ready-to-run Next.js starter apps, each demonstrating a different Arkiv primitive (CRUD, TTL, queries, subscriptions, attributes).
Replicate this → Ship a `create-X-app` CLI with one template per core primitive — the fastest onboarding path for any new SDK.
Wallet-owned p2p mentorship network: profiles, asks, offers, and session booking stored as Arkiv entities with TTL-aware UX.
Replicate this → Tie TTL to real-world event duration — sessions expire when they end, making on-chain cleanup automatic and semantically correct.
Bluetooth mesh relay that hops encrypted payloads device-to-device until a beacon can publish them to Arkiv as tamper-proof, queryable entities.
Replicate this → PBKDF2-derive a per-device Arkiv wallet from device pubkey + server salt — each field device self-funds without sharing keys.
Decentralized payroll platform storing employee profiles and invoices on Arkiv, with cross-chain payments via LiFi and Wormhole on Scroll L2.
Replicate this → Use Arkiv as the employee/invoice data layer (server-side createEntity + buildQuery) so payroll records are on-chain queryable without a centralized DB.
Wiki/docs platform where spaces, pages, revisions, backlinks, and live presence are all Arkiv entities — wallet owns the content, no DB needed.
Replicate this → Use 90s-TTL presence entities with a server-signed heartbeat to show live collaborators without wallet popups on every renew.
Event platform that turns in-person attendance into on-chain reputation — check-in codes expire in 2h, RSVPs in 60d, scores roll over 365d.
Replicate this → Use differential TTLs (2h codes, 60d RSVPs, 365d reputation) to keep on-chain state self-cleaning without manual deletes.
Darwinian memory for AI agents: observations start with a 1h TTL and earn longer life every time they influence a real decision.
Replicate this → Use extendEntity as a reinforcement signal — cited memories grow their TTL, uncited ones decay free, no cleanup code needed.
ESP32 signs EVM transactions offline, relays them via LoRa or Iridium satellite, and logs the full relay lifecycle as queryable Arkiv entities.
Replicate this → Use Arkiv's TTL + updateEntity for a durable scheduled-tx queue that survives service restarts — then transfer receipt ownership to the user on completion.
AI fact-checks cryptographically signed by an agent wallet and stored on Arkiv — anyone can verify the verdict without trusting the vendor.
Replicate this → Use Arkiv $creator immutability as a tamper-proof signer record — no centralized DB can forge or delete it after the fact.
Decentralized event platform (create, RSVP, check-in) where every interaction is an Arkiv entity — no database, no MetaMask required.
Replicate this → Model a full relational graph (6 entity types with attribute cross-references) entirely on Arkiv — no external DB needed.
Encrypted document vault where sharing links self-destruct on-chain — access grants live as Arkiv entities with per-link TTLs, no backend sweeper needed.
Replicate this → Use Arkiv TTL as your access-control layer: mint an access_grant entity whose lifespan equals the share window — revocation is just on-chain expiry.
Showing 12 of 104
Open challenges
Gaps spotted across the 104projects in this catalog. If you’re hunting for a hackathon idea — these are free real estate.
Nine event platforms were built — but an event created in one can't appear in another or feed a shared attendance reputation. Define a common entity schema and make two apps interoperate.
A worker network that watches queries, reacts to entity expiration or state changes, executes actions, and writes signed receipts back to Arkiv.
Nobody has tackled CRDT-style merging on top of Arkiv's single-owner entities. Build conflict resolution for collaborative docs or shared game state.
Turn human retention rules ('keep 5 years, then forget') into entity lifecycles with managed extensions — and explain what becomes unqueryable vs. what stays in history.
Multi-owner data + micropayments: publishers earn whenever their records satisfy someone's query. The pieces exist in separate projects — nobody has combined them.
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Every build above started at a weekend hackathon. Bring your idea to the Arkiv builder community — get help, share what you ship, and land on this page.