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Bridge contracts to support non-fungible tokens (ERC721)  #46

@akolotov

Description

@akolotov

The next phase of bridging assets between two blockchain network is to transfer non-fungible tokens (NFT). ERC721 could be used as the actual standard of NFTs.

There are few possible approaches to transfer NFTs between networks:

  1. Mirroring: complete transfer of a token from one chain to another. In this case the token on one side of the bridge is locked for all operations (token data and token ownership cannot be changed) and a mirrored token is created on another side.
  2. Splitting: different operations are split between two blockchains. For examplechanging ownership could be possible in one chain (e.g. to trade the token) whereas changing of token data (e.g. assets properties) could be done in another chain.

Depending on the approach bridge contracts could be different. Sounder this issue is being suggested to choose and discuss particular approach (or suggest a new one) and implement bridge and token contracts as per chosen way.

As soon as the contracts are developed another issue for off-chain part of bridge (https://github.com/poanetwork/poa-bridge or https://github.com/poanetwork/bridge-node/) to introduce corresponding logic should be created.

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