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Peer backup storage (feature 40/41/42/43) #881

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Commits on May 24, 2022

  1. Peer backup storage (features 40/41/42/43)

    Nodes can offer to altruistically store small amounts of data on behalf
    of their channel peers. It complements `option_data_loss_protect` and can
    let nodes that lost data fully recover their channels.
    
    There are two types of backups available:
    
    * Per-channel backups, for channel-related data
    * Per-node backups, for data potentially unrelated to channels
    
    There are two distinct pairs of features bits, because this is an
    assymmetric feature: one feature bit for the consumers and one for the
    providers of peer backups.
    
    This gives a lot of flexibility for use-cases where nodes may want to be
    both a consumer and provider of the feature, and lets consumers require
    their peers to be providers of the feature.
    t-bast committed May 24, 2022
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