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Revised to clarify a number of issues, including introducing the `cos… #99

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wolfmcnally merged 3 commits into from
Dec 8, 2021
Merged

Revised to clarify a number of issues, including introducing the `cos… #99

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213090a
Revised to clarify a number of issues, including introducing the `cos…
wolfmcnally Dec 7, 2021
302c416
Clarified derivation path descriptions.
wolfmcnally Dec 7, 2021
e761a37
Fixed hex in test vector, which incorrectly included the #6.311 tag n…
wolfmcnally Dec 7, 2021
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8 changes: 6 additions & 2 deletions papers/bcr-2020-010-output-desc.md
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Expand Up @@ -18,7 +18,9 @@ This document specifies a native CBOR encoding for output descriptors, as well a

### CDDL

The following specification is written in Concise Data Definition Language [CDDL]. The semantics and allowable nesting syntax is as described in [OD-IN-CORE].
The following specification is written in Concise Data Definition Language [CDDL]. The semantics and allowable nesting syntax is as described in [OD-IN-CORE] except for the extension described below.

This specification introduces an extension to [OD-IN-CORE], adding a new descriptor function `cosigner(KEY)`, which can be accepted by the `sh` and `wsh` script functions defined in [OD-IN-CORE]. The `cosigner(KEY)` is not used to derive ScriptPubKeys directly, but is used as a placeholder to be used when transmitting a single public key representing an account to be used by a party in a multisig transaction. This document defines a corresponding CBOR tag #6.410 to be used when encoding the `cosigner(KEY)` function.

```
key_exp = #6.306(crypto-eckey) / #6.303(crypto-hdkey)
Expand All @@ -34,7 +36,8 @@ script_exp = (
sorted-multisig / ; sortedmulti
address / ; addr
raw-script / ; raw
taproot ; tr
taproot / ; tr
cosigner ; cosigner
)

script-hash = #6.400(script_exp)
Expand All @@ -52,6 +55,7 @@ sorted-multisig = #6.407(multikey)
address = #6.307(crypto-address)
raw-script = #6.408(script-bytes)
taproot = #6.409(script_exp)
cosigner = #6.410(key_exp)

threshold = 1
keys = 2
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