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I've been working on the data migration from the existing solo chain to the Relay Chain. I've already fetched most of the data but i need to know about fetching the blocks. Is there any way to fetch the blocks too, and add them in the new chain.

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No. There is no way to fetch the blocks from one chain to another chain.You can only migrate the data not the blocks.

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I've been working on the data migration from the existing solo chain to the Relay Chain.

If you mean from solo chain to a parachain, yes you could keep the block history. You would need to migrate from your solo chain directly to a parachain. This way you could keep your entire history of blocks and state.

There is currently not an easy guide to follow. Here are some information.

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