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Discreet Log Contracts #576

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lollerfirst
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@lollerfirst lollerfirst commented Jul 10, 2024

Implementing @conduition 's awesome proposal (cashubtc/nuts#128) for discrete log contract execution on chaumian ecash mints.

@lollerfirst lollerfirst changed the title Discrete Log Contracts on E-Cash Discrete Log Contracts Jul 10, 2024
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codecov bot commented Jul 10, 2024

Codecov Report

Attention: Patch coverage is 83.28691% with 120 lines in your changes missing coverage. Please review.

Project coverage is 59.31%. Comparing base (8675745) to head (d561dbe).
Report is 11 commits behind head on main.

Files with missing lines Patch % Lines
cashu/mint/verification.py 69.46% 40 Missing ⚠️
cashu/mint/router.py 0.00% 21 Missing ⚠️
cashu/mint/db/write.py 84.88% 13 Missing ⚠️
cashu/mint/conditions.py 78.72% 10 Missing ⚠️
cashu/core/errors.py 81.81% 6 Missing ⚠️
cashu/mint/ledger.py 90.62% 6 Missing ⚠️
cashu/wallet/cli/cli.py 73.68% 5 Missing ⚠️
cashu/core/base.py 94.52% 4 Missing ⚠️
cashu/core/crypto/dlc.py 93.61% 3 Missing ⚠️
cashu/mint/crud.py 85.71% 3 Missing ⚠️
... and 5 more

❗ There is a different number of reports uploaded between BASE (8675745) and HEAD (d561dbe). Click for more details.

HEAD has 5 uploads less than BASE
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Additional details and impacted files
@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
- Coverage   69.02%   59.31%   -9.71%     
==========================================
  Files          92      101       +9     
  Lines        8674    11082    +2408     
==========================================
+ Hits         5987     6573     +586     
- Misses       2687     4509    +1822     

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@lollerfirst
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So now basically i wanted to add to the wallet the possibility of minting/swapping-for DLC locked proofs.
It would basically work like this:

cashu invoice <amount> --dlc-lock <dlc_root_hash> <-- mints dlc-locked proofs
cashu selfpay <amount> --dlc-lock <dlc_root_hash> <-- swap current proofs for dlc-locked proofs
cashu selfpay <amount> --dlc-unlock <dlc_root_hash> <-- swaps dlc-locked proofs for normal ones (using the backup secret)
cashu fund <dlc_root_hash> <-- generates a token with the proofs locked to dlc_root_hash.

Naturally this would imply a slight change in the DB table that holds the Proofs in order to accomodate dlc_root_hash and backup_secret where present

@lollerfirst
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And of course I am going to add tests for all of this.

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Wow thanks for getting the ball rolling on this! I was surprised to see this as I hadn't received any comments on either NUT drafts. @lollerfirst Is there any discussion which needs to happen to validate the spec itself before we push ahead with this implementation? I would be happy to help out with the code if that's what the cashu team is aiming for now.

cashu/core/crypto/dlc.py Outdated Show resolved Hide resolved
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lollerfirst commented Jul 11, 2024

Is there any discussion which needs to happen to validate the spec itself before we push ahead with this implementation?

I suppose so. But I thought I would get started in the meantime.
I believe in order to get it merged you'll have to give specific names the new type of requests/responses you're introducing (e.g. PostDlcRegistrationRequest, PostDlcPayoutRequest)

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By the way congrats on the proposal, it's very well written.

@gudnuf
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gudnuf commented Sep 13, 2024

working on a wallet implementation. the router was a bit broken, opened a PR to fix it

@lollerfirst
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lollerfirst commented Sep 13, 2024

@gudnuf Thank you! I haven't tested the router well. The tests I wrote check the functionality but do not go through the router.

Right now the only thing missing from the mint side is POST /v1/dlc/payout.

It's great you're working on a wallet implementation! Since the beginning I thought that the DLC orchestration between clients should be a separate thing from this.

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gudnuf commented Sep 15, 2024

Right now the only thing missing from the mint side is POST /v1/dlc/payout.

Looks like that's already implemented, no?

Since the beginning I thought that the DLC orchestration between clients should be a separate thing from this.

I'm working on this to help me learn rust, so forking it into cdk-cli. It will use NIP88 for the DLC orchestration between wallets

@lollerfirst
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lollerfirst commented Sep 15, 2024

Right now the only thing missing from the mint side is POST /v1/dlc/payout.

Looks like that's already implemented, no?

Since the beginning I thought that the DLC orchestration between clients should be a separate thing from this.

I'm working on this to help me learn rust, so forking it into cdk-cli. It will use NIP88 for the DLC orchestration between wallets

Yea I implemented it yesterday.

Nice! Will read about NIP-88.

Not everything here is properly commented and named, so if you have any issue let me know.

cashu/core/crypto/dlc.py Outdated Show resolved Hide resolved

class GetDlcStatusResponse(BaseModel):
settled: bool
unit: Optional[str] = None
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This is inconsistent from the spec. There is no unit field defined in the responses. I think including the keyset ID in the status response would make more sense than unit if anything.

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Weird mistake. I'll be sure to fix that.

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Test failing randomly I don't think it's related to this PR.

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3 participants