Watchtowers send LN breach remedy transactions (justice transactions) when they detect that one of their client’s counterparty has broadcast an outdated channel close transaction.

The service provided by watchtowers allows their clients to go offline for significant amounts of time without having to worry about their funds being stolen by a counterparty. Watchtowers are not entrusted with any funds, just the responsibility of monitoring the block chain and broadcasting transactions, although breach remedy transactions can be designed so that the watchtower receives a portion of the safeguarded funds if their services are needed.

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