combo() Output Script Descriptors

The five-minute read

One action, walked through

1. Open BIP 384 and read the status line before the examples.
2. Write down the rule in one sentence. A fair version of that sentence is: This document specifies combo() output script descriptors.
3. Name the object that changes: P2PK, P2PKH, P2WPKH.
4. Ask what an old client, an old contract, or an offline counterparty does. If the document is silent, the silence is part of the design.

The argument, unpacked

What has to be true

• You are implementing BIP 384 at the status the text itself states: Deployed.
• The object that has to change is P2PK, P2PKH, P2WPKH. A neighbouring document with a similar name is not this one.
• Measurements of delay in one year do not travel with the specification.

What happened after the paper

The source marks this deployed. That is a statement about the text, not a promise that every wallet or node has shipped it. Later documents can narrow, replace, or ignore this one. Cite the number you mean.

What to check before you use the idea

• Which message does combo() Output Script Descriptors add, and which old peer must still be answered?
• What does a node do when the short form fails and the full object is required?
• Which names are normative: P2PK, P2PKH, P2WPKH?

Terms

BIP 384

The public text titled combo() Output Script Descriptors.

Deployed

The document's own label for how finished the text is. It is not a market fact.

The problem the paper names

A node that cannot fetch, filter, or relay the data it is supposed to validate is not a peer of the network the paper describes.

What the design proposes

• This document specifies combo() output script descriptors.
• These take a key and produce P2PK, P2PKH, P2WPKH, and P2SH-P2WPKH output scripts if applicable to the key.
• In order to make the transition from traditional key based wallets to descriptor based wallets easier, it is useful to be able to take a key and produce the scripts which have traditionally been produced by wallet software.

How the mechanism is specified

• Taken from the specification, the next constraint is: These take a key and produce P2PK, P2PKH, P2WPKH, and P2SH-P2WPKH output scripts if applicable to the key.
• Locate P2PK, P2PKH, P2WPKH in BIP 384 and apply it to one transaction or call.
• Then check the failure the class of rule always has: a node that did not upgrade, a reverted call, a replayed signature, or a peer that does not speak the message.

What this page does not treat as proven

• A peer protocol is not a consensus rule. A peer can disconnect. A block is still valid or not on its own.
• Measurements of delay in one year do not travel with the specification.
• The source marks this deployed. That is a statement about the text, not a promise that every wallet or node has shipped it.

Why a venture studio still reads it

Use BIP 384 when a pitch says 'combo() Output Script Descriptors' without saying whether the rule is consensus, policy, or an interface. The number is the citation. The pitch is not.