> For the complete documentation index, see [llms.txt](https://ura-labs-1.gitbook.io/ura-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ura-labs-1.gitbook.io/ura-documentation/capacity-protocol/model-a-capacity-supply.md).

# Model A — Capacity Supply

Model A is the supply side of the Capacity Protocol.

A NIGHT holder authorizes selected NIGHT UTXOs to direct their future DUST generation to an external receiver. The selected NIGHT is not transferred to Ura.

## Bounded authorization facts

* The holder selects or approves the NIGHT capacity relationship.
* NIGHT remains in the holder's wallet.
* Future generated DUST is directed to the external receiver.
* The receiver/operator controls the generated DUST.
* The authorization must be reviewable and wallet-signed.

## Current evidence

One bounded redesignation plus receiver-side DUST observation has been demonstrated in controlled Preprod work.

## Current blocker

Generalized provider onboarding is not yet available because a supported wallet signing path has not been proven end to end. Ura will not replace wallet authorization with a prover-supplied boolean, unsafe witness or custodial shortcut.


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