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32 lines
1.4 KiB
Markdown
32 lines
1.4 KiB
Markdown
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<div class="cwikmeta">{
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"title":"INV",
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"related":["/protocol","/protocol/p2p/getdata","/protocol/p2p/filterload","/protocol/p2p/filterclear"]
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}</div>
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*Notifies peers about the existence of some information (block or transaction)*
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Based on selected services in the [VERSION]("/protocol/p2p/version") message, INV messages may not be sent.
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If a bloom filter has been sent to this node via [FILTERLOAD](/protocol/p2p/filterload), transaction INVs will only be sent if they match the bloom filter.
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| compact int | 4 bytes | 32 bytes |... | 4 bytes | 32 bytes |
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|----------|---------|----------|---|---------|----------|
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|[vector](/protocol/p2p/vector) size N of| type 1 | hash 1 | | type N | hash N
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NOTE: Since a block header is a relatively small data structure, and block propagation speed is an important network metric, a peer may send HEADER messages in place of INV messages when a block arrives.
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##### Type
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The type of the object that is available.
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| Type | Value|
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|------|------|
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| 1 | Transaction |
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| 2 | Block |
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| 3 | Filtered Block (partial block with merkle proof)
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| 4 | Compact block
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| 5 | Xthin block (Bitcoin Unlimited)
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| 6 | Graphene Block (Bitcoin Unlimited)
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Implementations: [C++](https://github.com/BitcoinUnlimited/BitcoinUnlimited/blob/eb264e627e231f7219e60eef41b4e37cc52d6d9d/src/protocol.h#L477)
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##### Hash
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The [hash identifier](/glossary/hash__identifier) of the available object.
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