Bitcoin Sign up or log in to customize your list._ Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top up vote down vote favorite 5 How does my bitcoin core client know when to drop a transaction from the memory pool?Is it as simple as a specific period of time?mempool up vote down vote As of Bitcoin Core 0.14.0, these are the ways a transaction can leave the mempool: The transaction was included in a block.The transaction or one of its unconfirmed ancestors conflicts with a transaction that was included in a block.The transaction was replaced by a newer version (see BIP 125).The transaction was at the bottom of the mempool (when sorted by fee per size), the mempool had reached its size limit (see the -maxmempool option), and a new higher-fee transaction was accepted, evicting the bottom.The transaction expired by timeout (by default 14 days after entering).

Also, transactions that have left the mempool can always enter them again.For example, when they're part of the local wallet and get rebroadcast, or when they're received again over the network.Eviction does not imply a transaction is cancelled.Since Bitcoin Core 0.14.0, the mempool is saved to disk, so it persists across restarts.ethereal knives gemIn earlier versions a restart would also result in a wiped mempool.bitcoin mining playstation 4up vote 5 down vote There is no fixed expiration time for each node, but the default setting is 72 hours.bitcoin mining flash drive/a/43165/24926 up vote 1 down vote In my particular case (unconfirmed not broadcasted transaction in memory pool of bitcoin core 0.14.1) the only way to remove that transaction was to delete mempool.dat after wallet close.bitcoin wallet cheat

So deleting mempool.dat effectively forces transactions to leave memory pool.Your Answer Sign up or log in Sign up using Google Sign up using Email and Password Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service.bitcoin mining fbiNot the answer you're looking for?bitcoin guy throws awayBrowse other questions tagged mempool or ask your own question._ Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top up vote 4 down vote favorite Why does Bitcoin keep (unconfirmed) transactions in a memory pool?What would happen if these were stored on disk instead?transactions mempool up vote 7 down vote A large part of those transactions only needs to be kept for a limited time, in the order of 10 minutes.

Once transactions are in a block they are removed from the mempool and the whole block is written to disk.However while the transactions are in memory they are actually consulted quite often.For every newly incoming transactions checks need to be done to see for example whether it conflicts with any of the existing transactions or whether it's a child or parent to an already existing one.Writing and reading them from disk will cause quite a bit of overhead.Which is actually important not just because it's a bit of overhead.For example it might open up DOS attacks where hostile nodes can create patterns of transactions that maximise reading and writing disk.Also for transaction and block propagation speeds it is important that transactions are validated as quickly as possible.Another point is that the amount of memory used by the mempool isn't actually huge anyway.Work is being done on better filtering of which transactions are allowed into the mempool in the first place (minimum fees and Child Pays for Parent etc.).

As well as expunging older and/or low fee or otherwise lower interest transactions out when the mempool nears full.up vote 0 down vote The answer for this is that miners need to have this in memory to consolidate tx for fee optimization and fast computation.Non mining /relay node can have mempool in disk.See reference The only concern for a relay node is to prevent DOS attack during relay of transactions which also can be prevented by bandwidth limits.Browse other questions tagged transactions mempool or ask your own question.Solution home CONSUMER EDUCATION HOW BITCOIN WORKS BITCOIN MEMORY POOL, THE BLOCKCHAIN, AND CONFIRMATION TIMES EXPLAINED Modified on: Fri, 2 Dec, 2016 at 3:43 PM AAARGH!WHERE IS MY BITCOIN?WHERE ARE MY CONFIRMATIONS!Periodically the MEMORY POOL on the BITCOIN NETWORK can get very crowded.We here at Athena Bitcoin Inc.append a "miner fee" (Satoshi's per byte) that is a premium to the going rate.This is so your transaction gets picked up from the MEMORY POOL and confirmed by the mining network and onto the BITCOIN BLOCKCHAIN faster than other transactions inside the Bitcoin Memory Pool.

Sometimes this premium is not enough.Sometimes it may take a few minutes or it may take a few hours for your transaction to be picked up and confirmed on the BITCOIN BLOCKCHAIN.Some wallets do not pick up transactions that have been confirmed on the BITCOIN BLOCKCHAIN in a timely manner.What wallet do you use?For smartphones we recommend our Athena Bitcoin Wallet that is powered by Airbitz.co, Press one of these buttons to download: We use TradeBlock to explore the BITCOIN BLOCKCHAIN and reference transactions.For future reference and resource to you.Input your BITCOIN ADDRESS in the search box at this link./bitcoin/explorer/ Here you will see if your transaction is confirmed (or not).For future reference of the size of the memory pool (and estimating how long confirms are taking in real time)  this is a goto this link./bitcoin/ If the current Memory Pool is LOW <10 MB Then it will (this is an estimate) it will take <1 hour to confirm on the BITCOIN BLOCKCHAIN.