v0.10.1: "eltoo: Ethereum Layer Too"

We're pleased to announce the 0.10.1 release of c-lightning, named by @nalinbhardwaj.

This is a recommended upgrade: payment secrets in invoices are now compulsory, and offers and dual funding drafts have been updated, so these (experimental) features are incompatible with previous releases!

NOTE: Users of the rebalance or drain plugins MUST update, as payment secret is now compulsory.

Highlights for Users

• experimental-dual-fund allows advertizement of funding rates which we will contribute to channels automatically, on a 1-month lease.
• withdraw and close (if peer supports) now supports Taproot (and other future) addresses.
• listchannels can now be queried by destination, as well as source.
• plugin rescan now automatically reloads plugins which have changed.
• We try to restart automatically if we notice subdaemons have been upgraded underneath us.
• fundpsbt will no longer include uneconomic UTXOs (unless all).
• close will return a stream of notifications if there is a delay in closing.
• Unilateral close feerates were reduced from bitcoind's "2 CONSERVATIVE" to "6 ECONOMICAL".
• Tor v2 is deprecated: please upgrade to v3!
• Fixed disconnection bug when an HTLC failed.
• Fixed bug in rapid feerate changes, and make code space them out (LND compat).
• Fixed bug where Tor on different ports could be advertized incorrectly.
• Fixed various bugs to make pay more robust.

Highlights for the Network

• payment secrets in invoices are now compulsory, finally closing a potential probing (or, with amountless invoices, stealing) attack.
• option_shutdown_anysegwit allows peers to close channels to any future segwit version address (taproot!).
• keysend now understands routehints, for routing to unpublished nodes, and sets the final CLTV to 22, for rust-lightning nodes.
• invoice now allows creation of wumbo invoices (> 0.0429 BTC).
• We will now discuss old channels with peers who reconnect, even if we consider them closed.

Highlights for Developers

• Manual pages now document exactly the JSON you can expect from each command (and it's tested!)
• Plugins can now publish notifications for other plugins to listen to.
• force-feerates allows complete feerate override (mainly for regtest), and a bug fixed where we could send 0 update_fee on regtest.
• The HSM daemon is now separated into libhsmd, which also provides Python bindings.
• createonion can now make variable-sized onions, and sendonion no longer requires direction and channel for firsthop.
• dev-sendcustommsg is now simply sendcustommsg.
• Many offers API improvements and updates, including unsigned offers (smaller QR codes!).

More details can be found in the changelog.

Thanks to everyone for their contributions and bug reports; please keep them coming.

Since 0.10.0, we've had 526 commits from 15 different authors over 114 days.

A special thanks goes to the 6 first time contributors:

• Nalin Bhardwa
• Nathanael
• LightningHelper
• OpenOms
• Urza
• Valentine Wallace

Cheers,
Lisa, Christian, ZmnSCPxj, Rusty.