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Anchors Are Evil! Bitcoin Core Is Destroying Bitcoin!

7 January 2025
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I actually thought that we had seen the underside when it comes to Bitcoiners making irrational and ridiculous arguments towards enhancements to Bitcoin, as a way to paint themselves as some form of righteous underdog combating towards corruption and incompetence from the within.

Boy was I fallacious.

So, some issues to clarify first. With Lightning channels, it’s important to resolve your fee-rate for a unilateral shut transaction forward of time. As a result of the precise UTXO is a multisig, each events to the channel should signal the transactions both facet makes use of to shut the channel unilaterally forward of time. All the safety of Lightning relies on having these. In case you ever wanted to make use of one, say as a result of your counterparty is being non-cooperative, you possibly can’t precisely depend on them to resign one at a better fee-rate when you wanted it.

This led to issues throughout unilateral price closures. If charges have been excessive and got here down because you opened your channel, you pay cash you didn’t have to. If charges have been low and went up, you possibly can’t assure that your channel closes in a well timed method. You may’t Change-By-Payment(RBF) as a result of your counterparty must signal, and you’ll’t use Youngster-Pays-For-Guardian(CPFP) as a result of all your outputs are timelocked, so nothing spending them will probably be legitimate till after the primary transaction really confirms and a number of blocks move.

Due to this, anchor outputs have been created. They have been particular outputs that exist with out timelocks for the only real function of with the ability to spend in a baby transaction to fee-bump the Lightning shut transaction. These added extra capital inefficiency although, requiring a non-negligible quantity of satoshis be used to create these outputs.

Enter ephemeral anchors, constructing on the v3 transaction relay and bundle relay (relaying transactions within the mempool as teams). The concept is to have a 0 worth output spendable with OP_TRUE(that means anybody can spend it). Transactions which have a fee-rate of 0, and embrace an ephemeral anchor, will probably be relayed within the mempool so long as there’s a little one transaction spending the ephemeral anchor output with an acceptable fee-rate.

This enables Lightning channels to signal unilateral closure transactions with no charges, and anybody who wants to make use of them can merely spend the ephemeral anchor output to set no matter fee-rate is required on the time. This enormously simplifies Lightning closure transactions, and removes capital inefficiencies of present anchor outputs. An added bonus is that anybody can price bump a transaction with an ephemeral anchor, not simply the channel (or different contract) house owners.

The ephemeral anchor by no means even creates the 0 worth UTXO within the UTXO set, as a result of it’s going to solely be relayed together with a transaction that immediately spends it in the identical block.

So why is that this an issue? Or an assault? I’ve no clue, it’s a tremendous simplification that basically any second layer protocol, or contract constructed on Bitcoin typically, that makes use of pre-signed transactions will profit enormously from. It causes no bloat of the UTXO set, as a result of as is within the identify, the outputs used are ephemeral. They aren’t really completely created.

The one arguments I’ve seen are “spam!” Or “Core builders are eradicating the mud restrict!” (A restriction on the minimal worth transaction outputs will need to have to be relayed, they usually aren’t eradicating it for something however ephemeral anchors, which have to be instantly spent by a baby to be relayed).

I feel we’re at a degree the place we have now to noticeably contemplate when it’s time to dismiss criticism or complaints surrounding technical material on this house. Or the place reputable criticisms cease being that, and change into irrational and illogical crusades towards or for personalities as an alternative of reasoned criticism. As a result of this backlash towards ephemeral anchors is incontrovertibly the latter.

All rational criticism needs to be welcomed in an open supply protocol like Bitcoin, however it is time to cease humoring irrational tribalism with no logical foundation as whether it is equal to reputable criticism. It’s not, it’s purely a waste of time and a Denial of Service assault towards the method of bettering Bitcoin. 

This text is a Take. Opinions expressed are totally the creator’s and don’t essentially mirror these of BTC Inc or Bitcoin Journal.



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Tags: AnchorsBitcoinCoredestroyingEvil
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