How do payment channels work?

#1

How do payment channels work?

#2

You can find a description in the spec, presently at https://github.com/filecoin-project/specs/blob/master/payments.md#payment-channels. Basically, the payer funds a channel with FIL and then provides signed vouchers to payees indicating the maximum value the bearer is entitled to withdraw from a payment channel. Payees can send a message to the PaymentChannelBroken to redeem a voucher.