Base
Hardened build
minimal ports, security patches applied at build time
Blnk 0.15 open-source double-entry ledger and financial core with PostgreSQL 16 and Redis on Ubuntu 24.04 LTS
Azure
Application Infrastructure
An open source double entry ledger and financial core, recording every money movement as an immutable, balanced transaction over a simple HTTP API.
Overview
Blnk is an open source double entry ledger exposed as an HTTP JSON API. It records money movements between balances as immutable, balanced transactions, enforces double entry invariants so every posting nets to zero, and supports multi currency balances, precise integer amounts and reconciliation. It is the state keeping foundation for fintech applications that move and hold funds, such as wallets, neobanks, payment flows and marketplaces.
Why the cloudimg image
cloudimg ships Blnk with PostgreSQL 16 and Redis together on one hardened, fully patched appliance that runs its database migrations and comes up ready to accept transactions on first boot, with a small demo ledger seeded so it is immediately live. Because the ledger holds financial records, the appliance is secure by default: the database and the queue are bound to loopback and never routable, and the ledger API runs in secure mode so every request must carry the per instance secret key. The secret key and the database and queue passwords are all minted uniquely per instance with no default login, and 24/7 support is included.
Common uses
- User balances and wallet accounting
- Payment and settlement flows
- Neobank and marketplace ledgering back ends
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