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remote-signing.md

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Remote signing

Remote signing refers to an operating mode of lnd in which the wallet is segregated into two parts, each running within its own instance of lnd. One instance is running in watch-only mode which means it only has public keys in its wallet. The second instance (in this document referred to as "signer" or "remote signer" instance) has the same keys in its wallet, including the private keys.

The advantage of such a setup is that the lnd instance containing the private keys (the "signer") can be completely offline except for a single inbound gRPC connection. The signer instance can run on a different machine with more tightly locked down network security, optimally only allowing the single gRPC connection from the outside.

An example setup could look like:

         xxxxxxxxx
  xxxxxxxxx      xxxx
xxx                 xx
x   LN p2p network  xx
x                   x
xxx               xx
   xxxxx   xxxxxxxx
        xxx
          ^                       +----------------------------------+
          | p2p traffic           | firewalled/offline network zone  |
          |                       |                                  |
          v                       |                                  |
  +----------------+     gRPC     |   +----------------+             |
  | watch-only lnd +--------------+-->| full seed lnd  |             |
  +-------+--------+              |   +----------------+             |
          |                       |                                  |
  +-------v--------+              +----------------------------------+
  | bitcoind/btcd  |  
  +----------------+

Example setup

In this example we are going to set up two nodes, the "signer" that has the full seed and private keys and the "watch-only" node that only has public keys.

The "signer" node

The node "signer" is the hardened node that contains the private key material and is not connected to the internet or LN P2P network at all. Ideally only a single RPC based connection (that can be firewalled off specifically) can be opened to this node from the host on which the node "watch-only" is running.

Recommended entries in lnd.conf:

# We apply some basic "hardening" parameters to make sure no connections to the
# internet are opened.

[Application Options]
# Don't listen on the p2p port.
nolisten=true

# Don't reach out to the bootstrap nodes, we don't need a synced graph.
nobootstrap=true

# Just an example, this is the port that needs to be opened in the firewall and
# reachable from the node "watch-only".
rpclisten=10019

# The signer node will not look at the chain at all, it only needs to sign
# things with the keys contained in its wallet. So we don't need to hook it up
# to any chain backend.
[bitcoin]
# We still need to signal that we're using the Bitcoin chain.
bitcoin.active=true

# And we're making sure mainnet parameters are used.
bitcoin.mainnet=true

# But we aren't using a "real" chain backed but a mocked one.
bitcoin.node=nochainbackend

After successfully starting up "signer", the following command can be run to export the xpubs of the wallet:

signer>  $  lncli wallet accounts list > accounts-signer.json

That accounts-signer.json file has to be copied to the machine on which "watch-only" will be running. It contains the extended public keys for all of lnd's accounts (see required accounts).

A custom macaroon can be baked for the watch-only node, so it only gets the minimum required permissions on the signer instance:

signer>  $ lncli bakemacaroon --save_to signer.custom.macaroon \
                message:write signer:generate address:read onchain:write

Copy this file (signer.custom.macaroon) along with the tls.cert of the signer node to the machine where the watch-only node will be running.

The "watch-only" node

The node "watch-only" is the public, internet facing node that does not contain any private keys in its wallet but delegates all signing operations to the node "signer" over a single RPC connection.

Required entries in lnd.conf:

[remotesigner]
remotesigner.enable=true
remotesigner.rpchost=zane.example.internal:10019
remotesigner.tlscertpath=/home/watch-only/example/signer.tls.cert
remotesigner.macaroonpath=/home/watch-only/example/signer.custom.macaroon

After starting "watch-only", the wallet can be created in watch-only mode by running:

watch-only>  $  lncli createwatchonly accounts-signer.json

Input wallet password: 
Confirm password: 

Input an optional wallet birthday unix timestamp of first block to start scanning from (default 0): 


Input an optional address look-ahead used to scan for used keys (default 2500):

Alternatively a script can be used for initializing the watch-only wallet through the RPC interface as is described in the next section.

Migrating an existing setup to remote signing

It is possible to migrate a node that is currently a standalone, normal node with all private keys in its wallet to a setup that uses remote signing (with a watch-only and a remote signer node).

To migrate an existing node, follow these steps:

  1. Create a new "signer" node using the same seed as the existing node, following the steps mentioned above.
  2. In the configuration of the existing node, add the configuration entries as shown above. But instead of creating a new wallet (since one already exists), instruct lnd to migrate the existing wallet to a watch-only one (by purging all private key material from it) by adding the remotesigner.migrate-wallet-to-watch-only=true configuration entry.

Migrating a remote signing setup from 0.14.x to 0.15.x

If you were running a remote signing setup with lnd v0.14.x-beta and want to upgrade to lnd v0.15.x-beta, you need to manually import the newly added Taproot account to the watch-only node, otherwise you will encounter errors such as account 0 not found when doing on-chain operations that require creating (change) P2TR addresses.

NOTE: For this to work, you need to upgrade to at least lnd v0.15.3-beta or later!

The upgrade process should look like this:

  1. Upgrade the "signer" node to lnd v0.15.x-beta and unlock it.
  2. Run lncli wallet accounts list | grep -A5 TAPROOT on the "signer" node and copy the xpub... value from extended_public_key.
  3. Upgrade the "watch-only" node to lnd v0.15.x-beta and unlock it.
  4. Run lncli wallet accounts import --address_type p2tr <xpub...> default on the "watch-only" node (notice the default account name at the end, that's important).
  5. Run lncli newaddress p2tr on the "watch-only" node to test that everything works as expected.

Required accounts

In case you want to provide your own account xpubs and not export them from an lnd node, you can derive them yourself. The extended public keys don't have to come from the same master root key, but normally they would. The main requirement is that the xpubs are at derivation level 3 (m/X'/Y'/Z').

In order for lnd to work properly, the following accounts MUST be provided as extended public keys when creating the watch-only wallet (otherwise you'll get an error along the lines of unable to create wallet: address manager is watching-only):

  • Purpose: 49, coin type 0, account 0 (m/49'/0'/0', np2wkh)
  • Purpose: 84, coin type 0, account 0 (m/84'/0'/0', p2wkh)
  • Purpose: 86, coin type 0, account 0 (m/86'/0'/0', p2tr)
  • Purpose: 1017, coin type X (mainnet: 0, testnet/regtest: 1), account 0 to 255 (m/1017'/X'/0' up to m/1017'/X'/255', internal to lnd, used for node identity, channel keys, watchtower sessions and so on).

Example initialization script

This section shows an example script that initializes the watch-only wallet of the public node using NodeJS.

To use this example, first initialize the "signer" wallet with the root key tprv8ZgxMBicQKsPe6jS4vDm2n7s42Q6MpvghUQqMmSKG7bTZvGKtjrcU3PGzMNG37yzxywrcdvgkwrr8eYXJmbwdvUNVT4Ucv7ris4jvA7BUmg using the command line. This can be done by using the new x option during the interactive lncli create command:

signer>  $ lncli create
Input wallet password: 
Confirm password:

Do you have an existing cipher seed mnemonic or extended master root key you want to use?
Enter 'y' to use an existing cipher seed mnemonic, 'x' to use an extended master root key 
or 'n' to create a new seed (Enter y/x/n):

Then run this script against the "watch-only" node (after editing the constants):

// EDIT ME:
const WATCH_ONLY_LND_DIR = '/home/watch-only/.lnd';
const WATCH_ONLY_RPC_HOSTPORT = 'localhost:10018';
const WATCH_ONLY_WALLET_PASSWORD = 'testnet3';
const LND_SOURCE_DIR = '.';

const fs = require('fs');
const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');
const loaderOptions = {
    keepCase: true,
    longs: String,
    enums: String,
    defaults: true,
    oneofs: true
};
const packageDefinition = protoLoader.loadSync([
    LND_SOURCE_DIR + '/lnrpc/walletunlocker.proto',
], loaderOptions);

process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA'

// build ssl credentials using the cert the same as before
let lndCert = fs.readFileSync(WATCH_ONLY_LND_DIR + '/tls.cert');
let sslCreds = grpc.credentials.createSsl(lndCert);

let lnrpcDescriptor = grpc.loadPackageDefinition(packageDefinition);
let lnrpc = lnrpcDescriptor.lnrpc;
var client = new lnrpc.WalletUnlocker(WATCH_ONLY_RPC_HOSTPORT, sslCreds);

client.initWallet({
    wallet_password: Buffer.from(WATCH_ONLY_WALLET_PASSWORD, 'utf-8'),
    recovery_window: 2500,
    watch_only: {
        accounts: [
        {
            'xpub': 'upub5Eep7H5q39PzQZLVEYLBytDyBNeV74E8mQsyeL6UozFq9Y3MsZ52G7YGuqrJPgoyAqF7TBeJdnkrHrVrB5pkWkPJ9cJGAePMU6F1Gyw6aFH',
            purpose: 49,
            coin_type: 0,
            account: 0
        },
        {
            'xpub': 'vpub5ZU1PHGpQoDSHckYico4nsvwsD3mTh6UjqL5zyGWXZXzBjTYMNKot7t9eRPQY71hJcnNN9r1ss25g3xA9rmoJ5nWPg8jEWavrttnsVa1qw1',
            purpose: 84,
            coin_type: 0,
            account: 0
        },
        {
            'xpub': 'tpubDDtdXpdJFU2zFKWHJwe5M2WtYtcV7qSWtKohT9VP9zarNSwKnmkwDQawsu1vUf9xwXhUDYXbdUqpcrRTn9bLyW4BAVRimZ4K7r5o1JS924u',
            purpose: 86,
            coin_type: 0,
            account: 0
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tHKVWG2gNjjijKUH1Lyv5NKFYdJnuaLGVNBVwyV5AbykhR43iy8wYozEMbw2QfmAqZhb8gnuL5mm9sZh8YsR6FjGAbew1xoT',
            purpose: 1017,
            coin_type: 1,
            account: 0
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tKkccDqNfDqZpd5wCs2n6XRV2Uh185DzCTbkDaEd9v7P837zZTYBNVfaRriuxgGVgxbGjDui4CKxyzBzwz4aAZxjn2PhNcQy',
            purpose: 1017,
            coin_type: 1,
            account: 1
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tNH4KH41i4oTsWfRjFigoH1Ee7urvHow51opH9xJ7mu1qSPMPVtkVqQZ5tE4NTuFJPrbDqno7TQietyUDmPTwyVviJbGCwXk',
            purpose: 1017,
            coin_type: 1,
            account: 2
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tQj5Zvav2ALhkU6dRQAhEtNPnYJVBC8hs2U1A9ecqxRY3XTiJKBDD7e8tudhmTRs8aGWJAiAXJN5kXy3Hi6cmiwGWjXK5Cv5',
            purpose: 1017,
            coin_type: 1,
            account: 3
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tSSR2LLBJtotxx2U45cuESLWKA72YT9td3SzVKHAptzDEx5chsUNZ4WRMY5h6HJxRSebjRatxQKX1uUsux1LvKS1wsfNJ2PH',
            purpose: 1017,
            coin_type: 1,
            account: 4
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tTwzfWvNoMoPpZbxdMEfe1WhbXJxvXikGixPa4ggSRZeGx6T5yxVHTVT3rjVh35Veqsowj7emX8SZfXKDKDKcLduXCeWPUU3',
            purpose: 1017,
            coin_type: 1,
            account: 5
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tYEDS2EByRedfsUoEwBtrzVbS1qdPrX6sAkUYGLrZWvMmQv8KZDZ4zd9r8WzM9bJ2nGp7XuNVC4w2EBtWg7i76gbrmuEWjQh',
            purpose: 1017,
            coin_type: 1,
            account: 6
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tYpwnFJEQaM8eAPM2UV5uY6gFgXeSzS5aC5T9TfzXuawYKBbQMZJn8qHXLafY4tAutoda1aKP5h6Nbgy3swPbnhWbFjS5wnX',
            purpose: 1017,
            coin_type: 1,
            account: 7
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tddKpAjUegXqt7EGxRXnHkeLbUkfuFMGbLJYgRpG4ew5pMmGg2nmcGmHFQ29w3juNhd8N5ZZ8HwJdymC4f5ukQLJ4yg9rEr3',
            purpose: 1017,
            coin_type: 1,
            account: 8
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tgE89V8ZdgMytC2Jq1iT9ttGhdzR1X7haQJNBmXt8kau6taC6DGASYzbrjmo9z9w6JQFcaLNqbhS2h2PVSzKf79j265Zi8hF',
            purpose: 1017,
            coin_type: 1,
            account: 9
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tiy9Bo8pRekXBPjExSDcHC4iSvvjABx4dzf63p8sYi2AcVbhc23EeWXhTJdXcKViDV1UDgq5P47223xXATrAzj6PuRmZuRA2',
            purpose: 1017,
            coin_type: 1,
            account: 10
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tkpAhiNWAnWkyLVGqKF8bRDvHWRuh4HC59wCLhmsqERQnS8eui3ruaAxiVadVhSBmMifUUXuAFwZY913YJiatyKr7yVQzVxD',
            purpose: 1017,
            coin_type: 1,
            account: 11
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tnkmbEykpik5uxUagGD7SShtx27gtS1Wtnzc8swgTRyWbkUwTXtoWBxD6FfTgPvjRo1rHaKGj69Cyt49yibhHCrenqvYUgfN',
            purpose: 1017,
            coin_type: 1,
            account: 12
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tqf1e7Dhuz7E3r2qeBFKuPT5YahwZ5AzxxbnA45etKbjRcDuFbf9GJNQjX7h3xACrEK4JfJ3WPFSBivG5FeDMhPZMSKPnkgc',
            purpose: 1017,
            coin_type: 1,
            account: 13
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tu1D4jVkj1HEFcEvZAqEswwTHK4pVhwjBDcJ4qAVsP4axBL3R5fvncHVDgV97hDLxbzPzodiRxjm6pqePGNeWxM4h7RsgeZ3',
            purpose: 1017,
            coin_type: 1,
            account: 14
        },
        {
            'xpub': 'tpubDDXFHr67Ro2twNzeuJXUbig9ycVL36jhsCP8LrXVTxVPRAuvREUEbnqDgnETqG1ddZbpssWKXbA6CDDt5hmiDKrWxWxHmS39aFfPZP35hyH',
            purpose: 1017,
            coin_type: 1,
            account: 15
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tyCbhCZk83MYGKuf6C8AW27biNGfKKj4t5vVQd26sPgA6q7W13rRAJMWzjEUPZhXsUDPUDeFyXncGgyqhxgWs3ufyeVkksdV',
            purpose: 1017,
            coin_type: 1,
            account: 16
        },
        {
            'xpub': 'tpubDDXFHr67Ro2tzp72ceFoNJUExE84Utx8CCVV83yZkeKuvUqLJJFhWCbky1WkzywhAP1TjKBH3ow7UvHfoUtebMPTU4sMrph7oAQy9qrkww3',
            purpose: 1017,
            coin_type: 1,
            account: 17
        },
        {
            'xpub': 'tpubDDXFHr67Ro2u4VuTDC6eXAn5B3MAR7tPg1L7fG79tXXqznAr2uWqe5Pda5nZYhJfWEqLhyM6WojqLXZbyavMowycPUztMHf3etdmWYaoDhw',
            purpose: 1017,
            coin_type: 1,
            account: 18
        },
        {
            'xpub': 'tpubDDXFHr67Ro2u7bARnVKUS2SBGQaPhS9APS5e3M5qDiweGJYGUTSCuzNGdFYAgMMPngHacRBHaUDn8eoPMopxMTXA2h7V4g3xxYjQU9srtR8',
            purpose: 1017,
            coin_type: 1,
            account: 19
        },
        {
            'xpub': 'tpubDDXFHr67Ro2u9xKbNpneHc7GSiHhoMHooxz9q8UWDrs77rMUgKbVZYnrSKdGP4EofiAYFZaUbd7vF1aaj3Du7skajn3dXRTHrLGrcPeSLEd',
            purpose: 1017,
            coin_type: 1,
            account: 20
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uCpznqbSss6zBW2oiDzur73yWyZBvGfPEbZ2p9EjQTrjy5mtk4S6v5y1yZcyw5XbMYQUQfitEuKKmjMKsXnE5ymqcsQbNs1b',
            purpose: 1017,
            coin_type: 1,
            account: 21
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uEJnZ35CgF9rnF2apyScr5CYcq1HGdWq8xvNxy8zoEAPXaD2SXwCpsvP1mpfqoginZQq4SJmMC7Cg7zkB3B4Dsp4E629izgM',
            purpose: 1017,
            coin_type: 1,
            account: 22
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uHeSSGySJu1V4xBTDV5skCJWkSUcxvg92vtKioYmERyn93TFSZdM2XDPQgiF1XSjTq28RhUhGvZSzVU9HY9fXGxkDxjDYA92',
            purpose: 1017,
            coin_type: 1,
            account: 23
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uKDhTSg2sz7YCtefjghZtbCraGMuU2c15PY58XmpJ3b9vypLXWEQx5js811jnxMnZ5FDwg347asddNnNySmhppnAxz6eS7rH',
            purpose: 1017,
            coin_type: 1,
            account: 24
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uLkyeZuKJMjLd9dgcissTrAUknhNumcFjkqVcNQKh1K1vu8JPMswx1qCU5tvQPv26jhgbZEpdpfL8LNV666NsoXfsTvorVdq',
            purpose: 1017,
            coin_type: 1,
            account: 25
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uPLRv1HJeudx6wcrAZYSVe1YfZrW4MTHFMobxSzmQCi93hC2HLC6vzdYy36GFEM3mZTSPahuhqfgvpEq8i5USgcer2ziQeoV',
            purpose: 1017,
            coin_type: 1,
            account: 26
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uTwg5aKW4bBAYsSWxyvPSatMQhH85FnUzDEhkTZGhSPUXT7qSUS8SFCpKXXhNvC5ZVirERav4An4dGWCGGYsz7VcmAn63etY',
            purpose: 1017,
            coin_type: 1,
            account: 27
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uVbv7bCGqmLL9CaBczbY2jxA34YB4u7NRugb8aro1eGNUyHXZJwhkWZDDBRgb6X4LH4G4xjd87xTpEEDi2Cmtab4xT3R8SJT',
            purpose: 1017,
            coin_type: 1,
            account: 28
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uZKmEbXNJB8LLYseLDvaAL7xxfcXutjPyT1BQ1fDPef1VMnaYp6Q3cbtAaDt7NvhCoqvoZieAfV7RYs8M2j2LEeiPgxpSHzj',
            purpose: 1017,
            coin_type: 1,
            account: 29
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uZo7V7m8cKKbeDCTJ2LgWPCqPy8iFU7YzbPCoCB8kZQa2ZQp2V26Ra4sUzLg2Piw9Rtn5d5P5bSyJ9xWycRe155VfGfHA8kq',
            purpose: 1017,
            coin_type: 1,
            account: 30
        },
        {
            'xpub': 'tpubDDXFHr67Ro2udnWeGsXdHH3uH1fMN7Xv8dC2eMbKgB7NCih9bCkA9VB8YsP6m4mMsvNt8uRTXvByQ8X7GaT1EmmT4WzFCqhd9HNMwB7mDuV',
            purpose: 1017,
            coin_type: 1,
            account: 31
        },
        {
            'xpub': 'tpubDDXFHr67Ro2ueXxcqy92aAniwc5iVAa6v7srbCJZU9jwQhidU9xj8hVBrjn7xZBkQzSnwaytxEDQVYqiM2XJzrufAqCbcJWPFEbjnorYRy8',
            purpose: 1017,
            coin_type: 1,
            account: 32
        },
        {
            'xpub': 'tpubDDXFHr67Ro2ujH6fgVmdgXYhd562RzRe9NCDfds8MnknSRwDSGvczM2aJghyvWpnzZ74MmzFwVweKMWQyYEagnyCPMxrzAzycHLFy6sH63c',
            purpose: 1017,
            coin_type: 1,
            account: 33
        },
        {
            'xpub': 'tpubDDXFHr67Ro2um39QyoXXjH7zERxrBVvvBTMKhKoHNkLrwmVzyNqbh68TXWkYw3MMNpmVQwwAWwXNBnTf7egN16v6aHncjwgaMj7WbdmtCpd',
            purpose: 1017,
            coin_type: 1,
            account: 34
        },
        {
            'xpub': 'tpubDDXFHr67Ro2unk1rHaZ3rqMSzWd16AB4nzNdWhHHaUCZhCi5KtwKg3GXXKVhZjUmAkd6xb6Hp3n2FJKu2tyDEmQw3B8RCaeA1XJ8k6cUkAR',
            purpose: 1017,
            coin_type: 1,
            account: 35
        },
        {
            'xpub': 'tpubDDXFHr67Ro2urkvuAfRw8rbNTbLUq4QPfnAkoju8maxZAsVJPFe6EMT5d5uFMyTGiYyKRsNpa73q1FZms87FQYEY4a2DBLADy9PkUH1Cw2T',
            purpose: 1017,
            coin_type: 1,
            account: 36
        },
        {
            'xpub': 'tpubDDXFHr67Ro2usWLg54YrtkgasYc6XFi7ygibwHWGuP1QwByzSqC9KYJaHM4rr3Ffs8NEBbw2z9UyhKQ1rxnKakbDKuhoh6R2xvSVva25DAh',
            purpose: 1017,
            coin_type: 1,
            account: 37
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uw8Syhc4sBzd597XrdQ6LMXf5FCUUsNzvw8UkDuuM7VMVC7i8pKDnWhkdC38fLeoQuzDUrspvZQwqEpZZmLbXGL7yxQmZYJx',
            purpose: 1017,
            coin_type: 1,
            account: 38
        },
        {
            'xpub': 'tpubDDXFHr67Ro2uyN1ZF1LAkoy3KbHR8qV3CCDJzbpQMZ4D5NKJSprcRec4aQLC5YXgG9dJ4hi7JY8aEex2fjdHzUmnkfEi1MGuqirN2zLXsC2',
            purpose: 1017,
            coin_type: 1,
            account: 39
        },
        {
            'xpub': 'tpubDDXFHr67Ro2v1KND6xi4oXVwozuu9XdFKkeGpGC9p6YzTJkBMUZSZy4ykn9WCv1eGCxgqtFkEVzm3wcxsU9w5zxVHdQ71mrz9Sp1dBQ5L6p',
            purpose: 1017,
            coin_type: 1,
            account: 40
        },
        {
            'xpub': 'tpubDDXFHr67Ro2v43ZVFUHQarNeSSMvxvXdrTepsbZFFMEHmyb2PCBHquLSmBFMu6RajiEVvvRQJbgLpfEQVoJEoqwzK6YugVQUbwSarVtni84',
            purpose: 1017,
            coin_type: 1,
            account: 41
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