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zpay32: add distinct hrp to invoice

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The Core devs decided to us the same bech32 HRP for Signet as is used
for the current Testnet3. This might be okay for on-chain addresses
since they are compatible in theory. But for invoices we want to use a
distinct HRP to distinguish testnet from signet.
Also see spec PR
https://github.com/lightningnetwork/lightning-rfc/pull/844 for more
information about the reasoning.
This commit is contained in:
Oliver Gugger
2021-03-04 16:12:07 +01:00
parent 4460903399
commit 044e1e692f
2 changed files with 23 additions and 5 deletions
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11
zpay32/encode.go
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@@ -5,6 +5,7 @@ import (
"encoding/binary"
"fmt"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcutil/bech32"
@@ -51,8 +52,16 @@ func (invoice *Invoice) Encode(signer MessageSigner) (string, error) {
return "", err
}
// The human-readable part (hrp) is "ln" + net hrp + optional amount.
// The human-readable part (hrp) is "ln" + net hrp + optional amount,
// except for signet where we add an additional "s" to differentiate it
// from the older testnet3 (Core devs decided to use the same hrp for
// signet as for testnet3 which is not optimal for LN). See
// https://github.com/lightningnetwork/lightning-rfc/pull/844 for more
// information.
hrp := "ln" + invoice.Net.Bech32HRPSegwit
if invoice.Net.Name == chaincfg.SigNetParams.Name {
hrp = "lntbs"
}
if invoice.MilliSat != nil {
// Encode the amount using the fewest possible characters.
am, err := encodeAmount(*invoice.MilliSat)