The autumn wind came overnight, and the hearts of the people were cold. I don't know if it was the dealer's response to 94. When I woke up, the market price was as follows. New leeks and old leeks can't escape. (my heart is so cold)

"Mining, selling and withdrawing", "buying and selling to earn" and "FOMO down" are common states of people in the currency circle around me recently. Friends who always feel that they can’t catch up with hot spots are driven by a kind of FOMO every day. How long can liquidity mining last? At the beginning of liquidity mining, some people said that it would not last for two weeks. It looked so CX, and then watched the ten-fold coins one by one, and the hundred-fold coins broke out. Cool, but now the imitation disk is still flying.

What is cross-chain

What is cross-chain

In a narrow sense, cross-chain is a protocol that resolves the transfer, transfer, and exchange of assets and functional states on two or more different chains. In a narrow sense, a sidechain is a protocol that allows assets to be transferred from the main chain to other subsidiary blockchains, and can be safely returned to the main chain from other subsidiary blockchains.

In a broad sense, sidechains and cross-chains are specific solutions for interchain interoperability protocols, so we collectively refer to all sidechains and cross-chain protocols as cross-chain interoperability protocols.

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Cross-chain classification

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Polkadot's cross-chain

Polkadot, as a cross-chain duo, naturally has attracted attention for its cross-chain solution.

Polkadot uses a relay chain (RelayChain) to provide verification and routing functions for cross-chain communication in the entire system, while other parallel chains (ParaChain) in the system can forward cross-chain information to other parallel chains through the relay chain. To achieve the purpose of cross-chain.

Polkadot's cross-chain process:

The first stage is the stage of the parachain, that is, the parachain will produce a block, and then the collector will transmit this block to our relay chain.

The second block is the relay chain. After receiving the block, it will conduct a lot of verifications, and finally form a candidate receipt, which is the candidate receipt, and finally submit the candidate receipt to the block.

The third part is a sub-protocol of availability, which mainly involves the design of the erasure code.

The fourth to sixth blocks are actually after the block has been produced, we will perform a lot of secondary verification, and some verifications by independent auditors like fisherman, and finally pass our grandpa to make the entire block The chain performs a determination of finality.

Needless to say, the advantages of Polkadot, here are the problems of Polkadot:

1) Polkadot's cross-chain protocol is based on a single source of trust (absolute trust in RelayChain), which means it is semi-centralized.

2) The complexity of Polkadot's cross-chain protocol is high, and some problems may arise in each verification stage

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Cross-chain of RenVM

RenVM is a feature-rich decentralized host that is trustless and permissionless.

RenVM uses a Byzantine BFT network to solve interoperability between blockchains. By combining consensus with a secure multi-party computation (MPC) algorithm, RenVM can instantiate decentralized, permissionless and trustless custodians

Unlike centralized custodians, tokens deposited into RenVM are stored in selected groups of the Ren community, rather than in the custodian's wallet. They are called “darknodes,” which refers to the network of thousands of computers that also guarantee the validity of transactions on Ren. RenVM will update the shard once a day, and randomly select a new person to manage the address to prevent the occurrence of joint evil

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Cross-chain of MOV

MOV adopts the threshold multi-signature gateway mode for cross-chain

The core element of the cross-chain gateway Federation is to establish a decentralized federated gateway. The essence is to form a co-governance and co-management alliance gateway network system driven by the key participants in the big ecology with a reasonable economic model and business concerns. Overall safety and reliability, flexible management and decentralization of power. Open the free election and economic governance of the federation nodes of the gateway (with the help of the node plan already available in the public chain's own ecology), establish a complete identity verification and reputation risk assessment mechanism, and the replacement, rewards and punishments of nodes need to be disclosed under a set of governance consensus models It is transparently completed and has a perfect cycle design. The gateway federation node should be decoupled from the side chain consensus node to avoid the extreme situation of collective evil in the side chain. The architecture is decoupled, and it is easy to change the side chain and expand multi-assets.

At the same time, in the governance of the gateway, the introduction of the TSS threshold signature mechanism can make the governance of the gateway more secure and flexible. The advantages are as follows:

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Prospects for the future of cross-chain

The current cross-chain only focuses on the cross-chain of assets, that is, assets between multiple chains interact between each chain, but the technology stack between chains cannot be shared. With subsequent development, if it is possible to Layers of mutual verification, then Dapp can be very convenient to interoperate, thus bursting out greater imagination.