ledger-core · playground — an event-sourced ledger, ● live
the story
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concurrency
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failure design
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Every button below makes real calls to the public API with the key above — the page has no backdoor. Start with step 1.
ask the statement
read models — projections (eventually consistent)
Balances appear once accounts exist. Watch the version tick as projections catch up.
api exchange — what the caller sees
No calls yet. Run step 1.
the journal — what was recorded
The append-only event log is the source of truth; balances above are derived from it. Entry № is the global position. Dots thread one command’s correlation id across streams.
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The log is empty. Every action appends here; nothing is ever updated in place.