A lame version of this relies on an external sequencer. I think the cooler version is just a merge rule that reads all the chains. So users can send txs anywhere
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Solana co-founder proposes ‘meta blockchain’ to unite decentralized ecosystems
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Anatoly Yakovenko’s meta blockchain is not intended to operate as a standalone blockchain layer but as a protocol-level aggregator that unifies data and transaction ordering across multiple chains.
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