<p>Each full Bitcoin node has what is known as &quot;<code>mempool</code>&quot;. <code>mempool</code> is where transactions are stored in preparation for propagation into a <em>proposed</em> block during the mining process.</p>
<p>It's somewhat counter-intuitive but each node has it's own <code>mempool</code> and transactions (as they are posted by BTC users), will be propagated throughout the network and be stored in many <code>mempools</code> globally, until they are eventually &quot;mined&quot;, i.e. a <code>SHA256</code>(<code>proposed_block</code> <code>||</code> <code>nonce</code>) &lt; <code>target</code>.</p>

CC BY-SA 4.0
2020-08-04T16:52:14.717Z
2020-08-04T16:59:58.417Z
Woodstock
<p>Bitcoin is a peer-to-peer gossip flood network. Whenever a Bitcoin participant creates a transaction, their wallet software submits it to its peer nodes. These peers then relay it to their peers in turn. The transaction floods through the network and reaches most nodes. Eventually, the transaction is included in a block which makes the transaction part of the committed history of the network. Blocks have propagation guarantees, because the blockchain is the mechanism for nodes to converge on a globally shared state. Now, every node is guaranteed to get the transaction since they will get the block.</p>
<p>So, each transaction originates from the sender's node, and eventually, every participant's node will have a copy of each confirmed transaction.</p>

CC BY-SA 4.0
2020-08-06T03:57:20.573Z
At a very high level -- you want miners to get your transaction because you want it to be included in a block. Miners want to get your transaction because they will get the transaction fee if they include it in a block. Given two parties with internet access who each have an incentive to exchange data with the other, there is nothing even remotely difficult about making the exchange work.
David Schwartz
CC BY-SA 4.0
2021-02-20T16:45:13.487Z
So where are the APi’s or endpoints to connect to it?
WJA
CC BY-SA 4.0
2020-08-04T17:55:44.820Z
2020-08-04T17:55:44.820Z
Murch
<p>I heard bitcoin and other cryptocurrencies have no central system.</p>
<p>BUT where do you send the transaction id?</p>
<p>There must be a server to send the data to!?</p>
<p>It probably is a simple question but, that's the thing I never understood on bitcoin and cryptocurrency.</p>

<sending><transaction-propagation><p2p><architecture>
Since Bitcoin has no central system, where do network request go?
Hexception
# Since Bitcoin has no central system, where do network request go?

(Asked by: username_0 on 2020-08-04)

I heard bitcoin and other cryptocurrencies have no central system.

BUT where do you send the transaction id?

There must be a server to send the data to!?

It probably is a simple question but, that's the thing I never understood on bitcoin and cryptocurrency.

**Tags:** sending, transaction-propagation, p2p, architecture


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## 2 answers

### Answer by username_2 on 2020-08-04. Score: 5 | Accepted answer

Bitcoin is a peer-to-peer gossip flood network. Whenever a Bitcoin participant creates a transaction, their wallet software submits it to its peer nodes. These peers then relay it to their peers in turn. The transaction floods through the network and reaches most nodes. Eventually, the transaction is included in a block which makes the transaction part of the committed history of the network. Blocks have propagation guarantees, because the blockchain is the mechanism for nodes to converge on a globally shared state. Now, every node is guaranteed to get the transaction since they will get the block.

So, each transaction originates from the sender's node, and eventually, every participant's node will have a copy of each confirmed transaction.

> **Comments:**
> **username_3**: At a very high level -- you want miners to get your transaction because you want it to be included in a block. Miners want to get your transaction because they will get the transaction fee if they include it in a block. Given two parties with internet access who each have an incentive to exchange data with the other, there is nothing even remotely difficult about making the exchange work.  
> **username_4**: So where are the APi’s or endpoints to connect to it?  

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### Answer by username_1 on 2020-08-04. Score: 1

Each full Bitcoin node has what is known as "`mempool`". `mempool` is where transactions are stored in preparation for propagation into a *proposed* block during the mining process.

It's somewhat counter-intuitive but each node has it's own `mempool` and transactions (as they are posted by BTC users), will be propagated throughout the network and be stored in many `mempools` globally, until they are eventually "mined", i.e. a `SHA256`(`proposed_block` `||` `nonce`) < `target`.


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