Feat: add Heiko kbtc

[bvotteler]

Resolves #43

Add XCM support for Heiko: KBTC

Links to constructed test tx:

• kintsugi -> heiko
• heiko -> kintsugi

[sander2]

Since we will have a bunch of these prs, I would propose to setup some PR guidelines. Specifically, before merging such prs, I'd like to see some kind of proof that generated extrinsic actually works. This could be:

• If the channel and both chains are set up, then:
  • if there are recent transactions already, provide a subscan link to a historic successful transfer, plus the polkadotjs link of the generated encoded extrinsic. Reviewers can compare the both.
  • if no transactions were made yet, use the code to make a test tx yourself and provide the subscan link to that tx here. Reviewers can verify that it works
• If the channel or one of the chains is not ready yet, provide only a polkadotjs link of the generated encoded extrinsic. Reviewers can verify that the output looks plausible

[bvotteler]

Since we will have a bunch of these prs, I would propose to setup some PR guidelines. Specifically, before merging such prs, I'd like to see some kind of proof that generated extrinsic actually works. This could be...

Good suggestion, thank you.

For these PRs, I will not have the means to test the transactions (no funds to shuttle across the chains repeatedly). I'm not interested in gaining access to Interlay's test accounts, either. It's more secure the fewer people have access, plus there will be extensive tests once this is added to the UI.

It's easy enough to provide (links to) the generated extrinsics, so providing them is a no-brainer.
Would it make sense to search for and link similar xcm transactions (same token) to other chains for comparison if they exist?

[sander2]

Since we will have a bunch of these prs, I would propose to setup some PR guidelines. Specifically, before merging such prs, I'd like to see some kind of proof that generated extrinsic actually works. This could be...

Good suggestion, thank you.

For these PRs, I will not have the means to test the transactions (no funds to shuttle across the chains repeatedly). I'm not interested in gaining access to Interlay's test accounts, either. It's more secure the fewer people have access, plus there will be extensive tests once this is added to the UI.

It's easy enough to provide (links to) the generated extrinsics, so providing them is a no-brainer. Would it make sense to search for and link similar xcm transactions (same token) to other chains for comparison if they exist?

It would help but that's not a guarantee it'll work due to differences in e.g. existential deposit & fees.

I think it's better to test as early as possible, rather than only after it gets added to UI. I get your point re: security, but if it's just a test account with < 100 usd worth of assets it's not much of a risk. I'd say it's worth it, especially since it also saves money in dev time if we catch problems as early as possible (no context switching, no coordinating of different people, no downstream redeployments, etc)

[bvotteler]

Local testing (chopsticks) - transferring KBTC
Succeeded with Alice account.

Kintsugi -> Heiko
Kintsugi:

Heiko:

Heiko -> Kintsugi
Heiko:

Kintsugi: