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Add keysend invoice #857

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10 changes: 10 additions & 0 deletions 11-payment-encoding.md
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Expand Up @@ -7,6 +7,7 @@ over Lightning.

* [Encoding Overview](#encoding-overview)
* [Human-Readable Part](#human-readable-part)
* [Keysend Invoice Overview](#keysend-invoice-overview)
* [Data Part](#data-part)
* [Tagged Fields](#tagged-fields)
* [Feature Bits](#feature-bits)
Expand Down Expand Up @@ -60,6 +61,15 @@ The following `multiplier` letters are defined:
* `n` (nano): multiply by 0.000000001
* `p` (pico): multiply by 0.000000000001

# Keysend Invoice Overview

Keysend invoice is a subset of standard invoice with the following differences:
- prefix is set to `lnks` + BIP-0173 currency prefix (e.g. `lnksbc` for Bitcoin mainnet,
`lnkstb` for Bitcoin testnet, `lnkstbs` for Bitcoin signet, and `lnksbcrt` for
Bitcoin regtest).
- `p` tagged field MUST NOT be included.
- `amount` and `multiplier` MUST NOT be included.

## Requirements

A writer:
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