Bitcoin: What does lastsend and lastrecv in “getpeerinfo” rpc mean?

Understanding the fields “LastSend” and “Lastrecv” in Bitcoin RPC

The Getpeerinfo RPC request is a key interface provided by Bitcoin Core software to recover information about colleagues connected to your local node. Among the various fields returned, two stand out: LASTSEND and Lastrecv. These fields seem to describe some kind of date and time record, but what do they really represent? In this article, we will divide the meaning behind these fields and explore their implications for the transmission of P2P messages.

TheLastsendfield must contain UNIX's EPOCH (UTC) time (UTC), in which a colleague last sent a transaction. This means that if you are checking the local knot using this method,LASTSENDwill provide the date and time record when the corresponding transaction was committed.

Imagine that you are in a P2P network and send a new block to someone else (let's call thempair a). Once the block is added to the current by your local node, you can check usingGetpeerinfowith the following parameters:

Bash

GETPERINFO PEERADDRESS 1234567890ABCDEF, LASTSEND = 1643723401, LASTRECV = 1643723402

`

Here, the LASTSEND is defined as 1643723401 (the time in seconds since January 1, 1970: 00:00 UTC) when the transaction was committed by Pareer A. the same way,Lastrecv would be 1643723414 (the time in seconds Since January, 1970, 00:00 UTC), which is the current date and time record.

What does “LASTRECV” mean?

The Lastrecv field must contain the time of the time of Unix when a colleague received data from you for the last time. This means that if you are checking the local node using this method, Lastrecv will provide the date and time stamp when the local node sent or receive the corresponding data.

To put it another way: LASTSEND shows what happened on the other side (the transaction), while theLastrecv shows what was happening on your side (your local node shipment/receipt data).

Here is an example:

`Bash

GETPERINFO PEERADDRESS 1234567890ABCDEF, LASTSEND = 1643723401, LASTRECV = 1643723412

`

In this case, LASTSEND is defined at the moment when Peer has committed it. Meanwhile, the Lastrecv would be defined as the current date and time record (1643723412), indicating that the local node was receiving data from the Parer at that time.

Implications for transmission of P2P messaging

When using RPC ‘Getpeerinfo’ with these fields, you can make informed decisions about whether a transaction or data has been sent and received. For example:

• If LASTSEND is different from zero eLastrecv for zero, it indicates that the local knot has sent data to peer in recent times (since the last shipping).

• If LastSend and Lastrecvare different from zero, it suggests that several pairs have recently exchanged data with you.

In conclusion, theLastSendE Lastrecv` fields on the Bitcoin Core RPC provide a way to analyze the P2P messaging transmission, checking when each colleague sent and last received data. These values ​​offer valuable information about your local knot activity on the network, helping you refine your strategies to deal with messages and transactions received.

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