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NUT-11: Add SigAllSigningPackage transport format for multi-party SIG_ALL signing #345

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NUT-11: Add SigAllSigningPackage transport format for multi-party SIG_ALL signing #345

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docs(nut-11): add SigAllSigningPackage for multi-party SIG_ALL signing
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39 changes: 39 additions & 0 deletions 11.md
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,44 @@ msg = secret_0 || C_0 || ... || secret_n || C_n || amount_0 || B_0 || ... || amo

Here, `||` denotes string concatenation. The `C` of each input and `B_` of each output are **hex strings** and `amount` is a UTF-encoded string.

### SigAllSigningPackage

To facilitate multi-party signing for [`SIG_ALL`](#signature-flag-sig_all) transactions, wallets can exchange a `SigAllSigningPackage` containing the minimal data required to reconstruct the transaction message and produce signatures. It is a wallet-to-wallet transport format. Mints do not process these packages.

The `SigAllSigningPackage` has the following structure:

```json
{
"version": "sigallA",
"type": "swap" | "melt",
"quote": <str>, // Optional, for melt only
"inputs": [
{
"secret": <str>,
"C": <hex_str>
}
],
"outputs": <Array[BlindedMessage]>,
"digests": {
"legacy": <hex_str>, // Optional
"current": <hex_str>
},
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"witness": {
"signatures": <Array[hex_str]>
} // Optional
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}
```

The package is serialized to a string by JSON-encoding the object with specific key ordering (see `SigAllSigningPackage` definition), converting to base64url, and prefixing with `sigallA`. The keys must be sorted as: `version`, `type`, `quote` (if present), `inputs`, `outputs`, `digests` (if present), `witness` (if present).

Below is a sample base64url encoded `SigAllSigningPackage`.

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```
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
```
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See the [test vectors][tests] for a full example.

## Locktime Tag

The `locktime` tag signals which set of locking rules the mint should apply. There are three possible states the `locktime` tag can represent:
Expand Down Expand Up @@ -288,3 +326,4 @@ The [NUT-06][06] `MintMethodSetting` indicates support for this feature:
[10]: 10.md
[11]: 11.md
[12]: 12.md
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[tests]: tests/11-test.md
64 changes: 64 additions & 0 deletions tests/11-test.md
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Expand Up @@ -409,3 +409,67 @@ The following is a valid multi-sig `SIG_ALL` `MeltRequest`.
]
}
```

### SigAllSigningPackage Test Vectors

The following is an example of a `SigAllSigningPackage`, derived from a `swap` transaction.

Input transaction data:

```json
{
"inputs": [
{
"amount": 2,
"id": "00bfa73302d12ffd",
"secret": "[\"P2PK\",{\"nonce\":\"c7f280eb55c1e8564e03db06973e94bc9b666d9e1ca42ad278408fe625950303\",\"data\":\"030d8acedfe072c9fa449a1efe0817157403fbec460d8e79f957966056e5dd76c1\",\"tags\":[[\"sigflag\",\"SIG_ALL\"]]}]",
"C": "02c97ee3d1db41cf0a3ddb601724be8711a032950811bf326f8219c50c4808d3cd",
"witness": "{\"signatures\":[\"ce017ca25b1b97df2f72e4b49f69ac26a240ce14b3690a8fe619d41ccc42d3c1282e073f85acd36dc50011638906f35b56615f24e4d03e8effe8257f6a808538\"]}"
}
],
"outputs": [
{
"amount": 2,
"id": "00bfa73302d12ffd",
"B_": "038ec853d65ae1b79b5cdbc2774150b2cb288d6d26e12958a16fb33c32d9a86c39"
}
]
}
```

Derived `SigAllSigningPackage` JSON:

```json
{
"version": "sigallA",
"type": "swap",
"inputs": [
{
"secret": "[\"P2PK\",{\"nonce\":\"c7f280eb55c1e8564e03db06973e94bc9b666d9e1ca42ad278408fe625950303\",\"data\":\"030d8acedfe072c9fa449a1efe0817157403fbec460d8e79f957966056e5dd76c1\",\"tags\":[[\"sigflag\",\"SIG_ALL\"]]}]",
"C": "02c97ee3d1db41cf0a3ddb601724be8711a032950811bf326f8219c50c4808d3cd"
}
],
"outputs": [
{
"amount": 2,
"id": "00bfa73302d12ffd",
"B_": "038ec853d65ae1b79b5cdbc2774150b2cb288d6d26e12958a16fb33c32d9a86c39"
}
],
"digests": {
"legacy": "cf6e80af354cd2da91a48159c43772eb38e5c1c08933a8709f063891a0f6006d",
"current": "de7f9e3ca0fcc5ed3258fcf83dbf1be7fa78a5ed6da7bf2aa60d61e9dc6eb09a"
},
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"witness": {
"signatures": [
"ce017ca25b1b97df2f72e4b49f69ac26a240ce14b3690a8fe619d41ccc42d3c1282e073f85acd36dc50011638906f35b56615f24e4d03e8effe8257f6a808538"
]
}
}
```

Serialized string:

```
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```