specification/protocol/p2p/headers.md

{ "title":"HEADERS", "related":["/protocol","/protocol/p2p/getheaders"] }

Provides a contiguous set of block headers

HEADERS Message Format

Size in bytes	Description	Data type
1+	Number of headers	varint
(81 + (1+)) * count	Block headers and number of txs in the block	Blockheader + varint

No more than 2000 block headers may be sent at one time. Block headers in this array MUST be sequential, ordered by height and without range gaps.

The number of txs in header is DEPRECATED and should be ignored. Nodes are allowed to send 0 regardless of the actual number of transactions in the block.