Does anyone know any way to interact between 2 contracts? or is it only with something Offchain or some Technology
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I assume you are looking for a bridge between two chains, so you can transfer assets between chains (essentially lock or burn on one chain and then release or mint on the other chain).
You could look at the example of the bridge between Ethereum mainnet and xDAI network: https://github.com/poanetwork/token-bridge