Since bitcoind/Bitcoin-qt 0.8, no transaction index is kept anymore by default, as it is not necessary for validation in the new database model.
Instead, there is only a database of unspent transaction outputs, which has enough information to (slowly) locate transactions in block files. getrawtransaction uses this, but it only works for transactions that ...
Looks like you can get some here:
The term "faucet" has been used for quite some time for a site giving away small quantities of coins for free. If the above link ever stops working, a web search for "bitcoin testnet faucet" may find a different site.
After having installed Bitcoin core on your machine, run the following command to start synchronising the testnet blockchain
bitcoind -testnet -daemon
The synchronisation starts as a daemon and runs in the background, you can issue the following the command to see the progress
To access the command line apis , just add ...
Have you tried understanding why you have that desire? It might help you understand more about what makes you tick.
You might like to try mining Litecoins, or even on the Bitcoin Testnet. Or, you could try some Bitcoin mining with the Eligius pool, which from memory will pay out any amount after 2 weeks (whereas most pools have a minimum payout). If you can ...
Changing these 2 lines gets what you want. Note that it's quick and dirty and will break non-testnet, so don't use this for anything but testnet:
diff --git a/src/main.cpp b/src/main.cpp
index a9311e2..b3496a1 100644
@@ -780,7 +780,7 @@ int64 static GetBlockValue(int nHeight, int64 nFees)
static const int64 ...
The current testnet is on its third iteration, somewhat unimaginatively titled testnet3.
It was put that way by this commit:
Testnet, Mark III
gavinandresen authored 2012-04-12
Before that, we had testnet2: (though we didn't call it that back then)
Reset testnet with a new genesis block
davout authored 2011-02-03
Before that, testnet:
Bitcoin doesn't use HTTP for its communications - it has its own specific protocol that runs directly on top of TCP. So an HTTP proxy like squid won't help.
If you aren't able to make outgoing TCP connections through your firewall (mainly to destination port 8333) then you'll have to contact your corporate IT people about adding appropriate firewall ...
The rules are the same, but the available range is different. In the testnet the address prefix is 111 (https://en.bitcoin.it/wiki/List_of_address_prefixes).
To deduce the address you write in base58 the prefix concatenated with a 160 bit (20 bytes) hash of the public address and a checksum of 4 bytes (https://en.bitcoin.it/wiki/...
Testnet bitcoins are less widely used in commerce than mainnet, and are not perceived as intended to be a currency.
Yes, you're unlikely to fetch a significant price though.
The transaction will not be recognized as a valid transaction. It would essentially be an irrelevant jumble. In fact the client wouldn't allow you to send anything because the address ...
I have recently created a TestNet Faucet. It is available on
I hope this remedies the situation
To answer your question - while there is nothing stopping people from charging for TestNet coins, I think they should be freely available to anyone for testing. It lets newcomers get a feel for what Bitcoin is without risking their ...
This rule is to prevent people from unintentionally spending Bitcoins that they wind up not owning.
For any Bitcoins other than the block reward, unless you intentionally double spend, a reorganization leaves your transactions valid. So they can just be included in the new blocks. (Assuming they don't spend the proceeds of a double spend.)
However, if ...
Testnet has a built in functionality that changes the difficulty to 1 if the mining process takes 20 minutes or longer.
This question explains the dropping of difficulty to 1.
So while the difficulty is 1, the blocks are being formed rapidly until the difficulty reaches to a value which takes 10 minutes.
You can use Bitcoin Core's testmempoolaccept RPC. It will tell you whether the transaction you give it would be accepted into your node's mempool at that time but won't actually add it to the mempool or broadcast it.
Testnet is designed to test Bitcoin software - including parts that have to do with finding blocks. As such, it should be easy for developers to generate testnet coins.
Because of this, it will be easy to solo mine on a CPU to generate them, and you should not use anything heavier than that because you would ruin it for everyone else.
It is also not ...
Depending on your OS you can start a 2nd bitcoin-qt acting on a non-mainnet with ./bitcoin-qt -testnet or ./bitcoin-qt -regtest (from a shell). You can also define a custom datadir and place a bitcoin.conf there (use bitcoin-qt -datadir=<path>).
On OSX/Mac you would need to use Terminal and run something like /Applications/Bitcoin-Qt.app/Contents/...
You probably want to run multiple bitcoind instances in regtest to simulate multiple nodes.
Thats pretty easy. You can run a second instance by starting bitcoind with a clean data directory and a different RPC and P2P port.
For that, you could create a 2nd data directory (example: /tmp/datadir2). Create /tmp/datadir2/bitcoin.conf.
Use something similar ...
The reason is not strictly the upgrade from 0.12 to 0.13, but from a version that does not support SegWit to one that does, after SegWit activated on the network.
Bitcoin Core 0.13 comes with the code preparations for SegWit, although they are only enabled for testnet. Several miners have run pre-release code for 0.13 on testnet ahead of time, causing ...
The answer is no, you can't, because the two chains don't share a common history.
Internally, transactions don't spend "from" an address. Instead, they refer to a specific output created by an earlier transaction which they consume.
In order for a replay attack to work, that same transaction whose outputs are being spent must exist on both chains. This is ...
It seems you're mixing up bitcoind and bitcoin-cli.
bitcoind is the Bitcoin Core daemon. It must be running first before you can do anything. bitcoin-cli is a tool to send RPC commands to a running bitcoind instance.
From the linked documentation page:
bitcoind -regtest -daemon
No need to put a & after the command if you run with -daemon.
You can run a mainnet and testnet bitcoind next to eachother without problems. They do not share the same database (one will use the testnet3/ subdirectory).
What will conflict is the RPC port, as they will both try to bind to port 8332 for receiving RPC connections. Use -rpcport=N on one of them to use a different port.
The core developers are listed on the main Bitcoin page, while everyone that contributed code are listed on the About page. Probably the most up-to-date info on what is happening with the code would be on the GitHub repo.
The main precaution against such practices should be the main client clearly stating that it is operating on testnet and perhaps with addition "for testing purposes only. Get free testing bitcoins at testnet faucet". This would protect some buyers, but not all (those that would be perhaps scammed into using a testnet eWallet or something).
As for why one ...
You can always try the testnet it is really easy to mine on it since difficulty gets reseted to difficulty one.
Just start your bitcoin client with the -testnet parameter (and -gen if you want to CPU mine)