Notifies peers about the existence of some information (block or transaction)
Based on selected services in the VERSION message, INV messages may not be sent.
If a bloom filter has been sent to this node via FILTERLOAD, transaction INVs will only be sent if they match the bloom filter.
| compact int | 4 bytes | 32 bytes | … | 4 bytes | 32 bytes |
|---|---|---|---|---|---|
| vector size N of | type 1 | hash 1 | type N | hash N |
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.
The type of the object that is available.
| Type | Value |
|---|---|
| 1 | Transaction |
| 2 | Block |
| 3 | Filtered Block (partial block with merkle proof) |
| 4 | Compact block |
| 5 | Xthin block (Bitcoin Unlimited) |
| 6 | Graphene Block (Bitcoin Unlimited) |
Implementations: C++
The hash identifier of the available object.