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# Response: Thin Block ("thinblock")
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This message delivers an `thinblock` to the remote peer.
The `thinblock` starts with the block header, followed by the hashes of all the transactions in the block.
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The transaction hashes are in the same order as they are in the actual block.
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All the transactions that are in the block, but not matched by the Bloom filter included in the previous [`get_xthin` ](get_xthin ) message should be appended, which should include at least the coinbase transaction.
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## Format
| Field | Length | Format | Description |
|--|--|--|--|
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| Block header | 80 bytes | [block header ](/protocol/blockchain/block/block-header ) | The header of the block transmitted. |
| Transaction hashes | # of tx * 32 bytes | vector | The hashes of all the transactions included in the block. |
| Missing transactions | variable | vector | Transactions that are included in the blocks but are not matched by the Bloom filter. |
