Some people answer that I should compare the block count with one of an online block chain monitor. That is not really a practical solution. The Bitcoin-Qt client has a way of knowing when syncing is done the V-sign vs the syncing icon , so why doesn't bitcoind?
How does the Bitcoin-Qt get this information? Slightly abstractly, and probably not useful in your case, the client is always syncing: there is no real difference between "having all blocks" and "not having all blocks" - it always has all blocks that it knows about, and doesn't know whether there are blocks which it misses. What the GUI shows you is a guess. It checks the age of the last known block, and if it is IIRC more than 90 minutes ago, it assumes it's out of sync.
This is usually a good indicator, but it will rarely yet certainly randomly fail from time to time. The core code has another heuristic built-in, which uses block heights reported by other nodes without verifying that information in any way, so it's easily cheated. This information is used to determine whether it should optimize cache behaviour for many fast operations, or reliability.
It's not exposed directly either, but the getwork and getblocktemplate RPCs will fail in this mode. Considering that you are always somewhat out of sync, here is how you can get by how long in seconds, and then you can divide by 60 or to get it in minutes or hours. I didn't find a way to do it in one call, so here is a script that does the whole thing, with no error checking as you can see:.
Or, assuming you have perl which you probably have and that you prefer to have the date of the last block:. So after having an IP or two banned because of checking to often You can try adding sleep between the assignment and calls but that would be very slow.
The last one above is likely the best for scripting as the file it saves to can be read for just the number inside or the last time it was modifide. The person to show the correct function was LoHoris, however, the updates to Bitcoin node software now uses bitcoin-cli getblocktemplate and not bitcoind for these lookups.
Thanks to both of them it is possible to offer you all a combination of both answers wrapped into a checker script; ready for your customization and updated for the year This script first checks the exit status of bitcoin-cli getblocktemplate because anything other than 0 is usually an error it'll run the other parts only if bitcoin-cli getblocktemplate shows an error.
Of course it is possible to check for specific error codes instead and do things for specific error codes These only run when local check of sync status error out thus if you're on a slower like Steven Roose mentioned then this script is ideal. And add one line to crontab to accomplish running on a schedule. Last modify the very end of the script to write output to a file. Hopefully this is acceptable enough of an answer to mark this question as [Solved] such that future web searchers can have an easier time of this.
If you're on linux, run "top". Once it's caught up, it's basically idle. Then, you can easly compare values and find out how many percent you are for downloading the blockchain. Sign up to join this community. The best answers are voted up and rise to the top. How to check if the block chain is up to date using bitcoind or json-rpc? Ask Question. Asked 7 years, 10 months ago.
Active 3 years, 11 months ago. Viewed 32k times. EDIT: Some people answer that I should compare the block count with one of an online block chain monitor. Improve this question. Steven Roose. Steven Roose Steven Roose In short: run bitcoind getinfo, compare the number after 'block count:' to the number here. BinaryMage That question does not make clear that it is about the daemon in the headline. I would have ignored it if I had seen it when I was looking for an answer. Check out my edit.
The getwork call will fail if you aren't up to date. Show 2 more comments. Active Oldest Votes. As others have said, there is no absolute way of telling if your blockchain is up to date. Anyway, here is my script: import httplib2 from bitcoinrpc. Improve this answer.
Konstantin Schubert Konstantin Schubert 3 3 silver badges 8 8 bronze badges. Add a comment. There is no way for checking whether syncing is done, simply because it isn't known. Pieter Wuille Pieter Wuille What is the benefit of the heuristic built-in over checking the age of the last known block? Bitcoind no longer supports RPC calls.
Try: watch bitcoin-cli getblockchaininfo When the displayed number of blocks equals the displayed number of headers, you're synced! Chris Chris 1 1 silver badge 2 2 bronze badges. This doesn't seem to work in all cases. I have a bitcoin-abc BCH testnet node which is synced, but headers is still significantly larger than blocks.
Returns a new bitcoin address for receiving payments, raising an exception on failure. Get detailed information about in-wallet transaction, raising an exception on failure. Add an address or pubkey script to the wallet without the associated private key. Returns all transactions affecting the wallet which have occurred since a particular block.
Returns most recent transactions in wallet, raising an exception on failure. Send an amount to a given address, raising an exception on failure. Link to this function call name, method. Link to this function generate name, amount. Link to this function generate! Link to this function getaccount name, address. Link to this function getaccount! Link to this function getbalance! Link to this function getblock name, hash. Link to this function getblock! Link to this function getblockchaininfo name.
Link to this function getblockchaininfo! Link to this function getblockcount name. Link to this function getblockcount! Link to this function getblockhash name, index. Link to this function getblockhash! Link to this function getinfo name. Link to this function getinfo! Link to this function getmemoryinfo name. Link to this function getmemoryinfo! Link to this function getmempoolinfo name. Link to this function getmempoolinfo! Link to this function getmininginfo name. Link to this function getmininginfo!
There are various solutions to the problem of distributed consensus. In this experiment, we examine the approach used by Bitcoin , a distributed currency with no central bank or other authority. In order for a distributed currency to work, members of the network must agree on how many units of the currency each member holds at all times, in order to prevent members from double spending , i.
This is, of course, a distributed consensus problem. Bitcoin uses a process called mining to reach a consensus. Members of the network who choose to take part in the process of reaching a distributed consensus are called miners. Mining involves forming a block containing a series of transaction records, then finding a valid proof of work for that block that satisfies certain rules. Specifically, miners increment a nonce until they find a value that gives the block's hash a certain number of leading zeros, thereby "finding" the next block in the blockchain.
For example:. Once a block has been "found", it is broadcast to all other nodes in the network, who validate the transactions it holds and accept the block if it is valid. Miners choose which transactions to include in the block they are mining based on priority algorithms that include metrics such as the age of the transaction and the value of its transaction fees.
So it is possible for two nodes to arrive at different "next blocks," potentially at the same time, and broadcast different blocks to the rest of the network. If this occurs, the blockchain is said to be forked , and the network needs some way to reach a consensus on which block to accept as the next block.
Bitcoin clients operate on a simple rule: always trust the longest chain of blocks. If a node received two "next blocks", it will save both and start to work on the next block in one of the chains. If in the meantime it receives a new block for one of the chains, it will discard the shorter chain and start to work on a next block for the longer chain. Miners have an incentive to work on the longest chain, rather than continuing to work on the chain following from the orphaned blocks, because they want to earn the Bitcoins associated with finding the next block in the longest chain.
The main chain black consists of the longest series of blocks from the genesis block green to the current block. Orphan blocks purple exist outside of the main chain. A key property of these blocks is that in order to replace a block that is already in the blockchain with one of its own, a node would have to compute the proof of work for that block and all subsequent blocks that have been added to the blockchain after it, since in order to get Bitcoin clients to accept your version of the blockchain, you need to have the longest chain.
Finding proof of work is computationally difficult, so the more blocks have been added to the blockchain after the block containing a particular transaction, the more secure it is and the less likely it is that the block will be replaced rolling back the transaction. Most Bitcoin clients consider the a Bitcoin transaction to be confirmed after six more blocks to be added to the chain, and the Bitcoins awarded for finding a new block are considered to be confirmed after blocks. This kind of consensus is not completely invulnerable to double spending.
Suppose an attacker submits a transaction to the network that pays some of its Bitcoins to another party, while simultaneously mining a private blockchain fork in which it re-uses the same currency for another transaction.
After waiting for n confirmations i. At this point, if the attacker has more than n blocks in its privately mined fork, he can broadcast his forked chain, including the double-spend transaction, to the network and effectively use the same Bitcoins twice.
If not, he can continue to try extending his private fork in hopes of surpassing the rest of the network, at which point he will release the fork. The probability of this succeeding depends on n and on how much hashing power the attacker has relative to the rest of the network. If an attacker controls more than half of the hashing power in the network i. Since the attacker can generate blocks faster than the rest of the network on average , eventually his private fork will surpass the blockchain constructed by the rest of network.
This is known as a majority attack. It is typically more profitable for a majority pool to use its hashing power honestly to generate new coins, than to use it to steal back payments made to other people. In this experiment, we will see how multiple confirmations are required before a Bitcoin transaction or mining rewards become spendable.
We will also see how a Bitcoin network reaches consensus when the blockchain is forked. In this experiment, we allow a fork to develop in a Bitcoin network. One side of the network has one hash for the last block in the chain:. After reconnecting the network, both forks still persist because they are of equal length. However, as soon as one more block is generated, all nodes in the network converge on the longer chain:. Download the following RSpec.
Once your resources are ready to log in, open five terminals, and in each, log in to one node. You may have to wait a few minutes after the nodes come up for it to finish installing the Bitcoin software. This mode lets us create a private blockchain to experiment with, and create new blocks on demand otherwise it would be impossibly difficult for us to mine blocks on our ordinary CPUs. Now that all our peers are connected, we are going to generate blocks, and watch them get propagated through the network.
It should still have a balance of 0, because the block it generated has not yet been confirmed by additional blocks. The other nodes still have a balance of zero, until the blocks they contributed are, in turn, confirmed.
Now we are going to split our Bitcoin network, allow unconnected parts of the network to generate blocks, and see what happens when they reconnect. This is the interface that connects node-3 and node-4 to nodes Find the name of the interface e. On the other hand, node-0, node-1, and node-2 will still have a blockchain length of We now have a blockchain with blocks in common between both sides of the network, followed by 20 different blocks.
Bitcoin also has a stipulation—set forth in its source code—that it must have a limited and finite supply. For this reason, there will only ever be 21 million bitcoins ever produced. On average, these bitcoins are introduced to the bitcoin supply at a fixed rate of one block every ten minutes. In fact, there are only 21 million bitcoins that can be mined in total.
However, it's possible that bitcoin's protocol will be changed to allow for a larger supply. What will happen when the global supply of bitcoin reaches its limit? This is the subject of much debate among fans of cryptocurrency. Currently, around This leaves less than three million that have yet to be introduced into circulation. While there can only ever be a maximum of 21 million bitcoin, because people have lost their private keys or have died without leaving their private key instructions to anybody, the actual amount of available bitcoin in circulation could actually be millions less.
The first With only three million more coins to go, it might appear like we are in the final stages of bitcoin mining. This is true but in a limited sense. While it is true that the large majority of bitcoin has already been mined, the timeline is more complicated than that. The bitcoin mining process rewards miners with a chunk of bitcoin upon successful verification of a block. This process adapts over time.
When bitcoin first launched, the reward was 50 bitcoin. In , it halved to 25 bitcoin. In , it halved again to On May 11, , the reward halved again to 6. This effectively lowers Bitcoin's inflation rate in half every four years. The reward will continue to halve every four years until the final bitcoin has been mined.
In actuality, the final bitcoin is unlikely to be mined until around the year However, it's possible the bitcoin network protocol will be changed between now and then. The bitcoin mining process provides bitcoin rewards to miners, but the reward size is decreased periodically to control the circulation of new tokens. It may seem that the group of individuals most directly affected by the limit of the bitcoin supply will be the bitcoin miners themselves.
Some detractors of the protocol claim that miners will be forced away from the block rewards they receive for their work once the bitcoin supply has reached 21 million in circulation. But even when the last bitcoin has been produced, miners will likely continue to actively and competitively participate and validate new transactions. The reason is that every bitcoin transaction has a transaction fee attached to it. These fees, while today representing a few hundred dollars per block, could potentially rise to many thousands of dollars per block, especially as the number of transactions on the blockchain grows and as the price of a bitcoin rises.
Ultimately, it will function like a closed economy , where transaction fees are assessed much like taxes. It's worth noting that it is projected to take more than years before the bitcoin network mines its very last token. In actuality, as the year approaches, miners will likely spend years receiving rewards that are actually just tiny portions of the final bitcoin to be mined. The dramatic decrease in reward size may mean that the mining process will shift entirely well before the deadline.
It's also important to keep in mind that the bitcoin network itself is likely to change significantly between now and then. Considering how much has happened to bitcoin in just a decade, new protocols, new methods of recording and processing transactions, and any number of other factors may impact the mining process. Bitcoin Magazine. Your Money.
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