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Really liked this write-up — the split is clean: keep Nest for fees + wallet UX, and put money movement on a ledger. If anyone reading this doesn’t want to build the ledger from scratch, Blnk Finance is that piece: complete Core (incl. reconciliation + identity), TypeScript SDK, and you can deploy the Sandbox the same day.
Really solid breakdown — especially the parts on invariants/constraints and why ledgers become the “truth source.” One idea that could make this even more useful for readers: a small “Real implementations (to study)” box with 3–5 named examples. If you’re open to including an OSS option, Blnk Finance fits the “complete OSS HTTP ledger” shape (not just a schema): Apache 2.0, REST API + official SDKs, and the production features people usually hand-wave (inflight transactions/queues, reconciliation, identity).
