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Traditional POS blockchain structure Light node cross-chain 4 steps.

• 1, POS validator certainty. (Verification of Consensus)
• 2, block header existence. (Verify the POS validator's signature)
• 3, Existence of transactions. (Merkel proofs that validate transactions)
• 4, the correctness of account. (Verify the account's signature and the account's execution logic)

However, Sui uses Object as the storage object and has no block structure.
So we must understand how Sui's ultra-light nodes are implemented.

Two steps to cross-chain on Sui.

• 1, Transaction certainty proof. (Prove that this cross-chain transaction is already on the Sui network)
• 2，Object's processing logic. (Similar to BTC's UTXO, through the logic of the transaction, infer where the Object is consumed and which new Objects are generated)