[FEATURE] MsgInstantiateContract2 support

[Nova-Ratio]

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Motivation

[MsgInstantiateContract2] (https://github.com/CosmWasm/wasmd/blob/v0.29.2/proto/cosmwasm/wasm/v1/tx.proto#L73-L96), or Instantiate2 for short, allows instantiating addresses at a predictable contract address. This is useful for off-chain services that can, e.g., create deposit addresses before instantiating a contract at that address. Now contracts get the ability to use Instantiate2. If you have a factory contract, you can now store the address of the newly created instance without the need for a reply call. Also, you can instantiate a contract and execute it right away. In that way, we can create more source-efficient structure for our dapps.

Solution

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Alternatives

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Anything else?

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Are you willing to submit a PR?

• I'm willing to submit a PR!

[philipsu522]

Thanks @Nova-Ratio ! This is an interesting feature. We'll add it to our backlog

[1Sandoval]

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