Ethereum Integration

[amangale]

High level steps for adding ethereum coin to ob-go

• Make wallet interface coin agnostic
• Implement the ethereum wallet based on the wallet interface
• Modify ob-go based on the new wallet interface
• Add Ethereum wallet to MultiWallet
• Bring Multiwallet to ob-go

Make wallet interface coin agnostic:

Current wallet interface is UTXO based. For ethereum, the wallet interface should not have dependencies like btc.Address, chaincfg.Params etc.
(OpenBazaar/wallet-interface#4) addresses the removal of btc.Address.

Implement the ethereum wallet based on the wallet interface

This implementation lives in two repositories:
https://github.com/OpenBazaar/go-ethwallet - The implementation of wallet interface for ethereum
https://github.com/OpenBazaar/smart-contracts - The smart contracts used by the ethereum wallet for escrow/multisig functioanlity

Modify ob-go based on the new wallet interface

As the wallet interface inroduces changes to become coin agnostic, there will be changes to the ob-go code. E.g., the Childkey method now delegates the responsibility of generating a child key for multisig to the wallet implementation rather than doing it in ob-go.

Add Ethereum wallet to MultiWallet

The ethereum wallet will be added to the existing multiwallet repository.

Bring Multiwallet to ob-go

Ob-go will support multiple cryptocurrencies (BTC, BCH, LTC, ZCASH and ETH) through multiwallet.

[Talkless]

Please consider implementing Ethereum support in a way to make Rootstock integration not too difficult/different.