How is the UTXO database initialized?

The IDs of the unspent transactions are stored in the UTXO database. I assume that it’s generated like this by the client:

for block in blocks:
    for transaction in block:

However, I have some doubts: What else is stored in the UTXO database? Does it store the actual amount of unspent coins for each transaction (which would seem necessary for the verification of the uncomfirmed transactions)?

Can I earn mining rewards by mining my own transactions?

Lets say, I have a proper industrial grade mining setup. I have two accounts. I transfer some bitcoins back and forth between two accounts. Both accounts are using the same machine or different machines in the same room. Since the network latency is negligible, it is going to win the race every time (provided the hardware is competitive enough).

This way I can game the system and get a lot of commission for maintaining the ledger for mostly myself.

I do not suppose I am the first guy to come up with this idea. Is there a technical name for it? If is this not feasible, why so?

Transfer Bitcoin to Google Wallet

I need to pay someone who doesn’t use Bitcoin. I don’t use paypal.

Is it possible to create a Google wallet and add Bitcoin to the balance? I have seen conflicting answers. I believe you cannot do it directly but I have seen sites that claim to give you $1.5 in Google Wallet money for each $1 in BTC you trade.

Is there a safe way to do this or another method?

trouble with bitcoin cli regtest

These are the commands I’m running after building a clean ubuntu docker image with all the dependencies:

./src/bitcoin-cli -regtest &

It yields the error:

error: too few parameters (need at least command)

Next I ran:

./src/bitcoin-cli -regtest -daemon

which resulted in:

error: too few parameters (need at least command)


./src/bitcoin-cli -regtest 101 & 


error: Could not locate RPC credentials. No authentication cookie could be found, and no rpcpassword is set in the configuration file (/root/.bitcoin/bitcoin.conf)

These commands have been taken from the following resource:

There’s a question here, and a corresponding answer that provides a script to start regtest, is that a good solution?

To stop the daemon use the interface or run bitcoin-cli stop.

Next step

so I ran first:

bitcoind -regtest -daemon

and I got the output:

Bitcoin server starting

then I tried:

bitcoin-cli -regtest getinfo

which resulted in:

error: Could not locate RPC credentials. No authentication cookie could be found, and no rpcpassword is set in the configuration file (/root/.bitcoin/bitcoin.conf)

these commands also generated the same output as above:

./src/bitcoin-cli -regtest help  
./src/bitcoin-cli -regtest 101

so I’ve created the following file:

vim /root/.bitcoin/bitcoin.conf

it’s literally just this:


*also tried with this:


and now issued the command:

bitcoin-cli -regtest getinfo

which resulted in the following:

error: couldn't connect to server: unknown (code -1)
(make sure server is running and you are connecting to the correct RPC port)

Can’t buy bitcoins from Greece via prepaid card

I have an account at National Bank of Greece and would like to buy bitcoins in Greece using a pre-paid Visa Card. Can someone point out how I could do that? I could also get one from another bank if that’s necessary. I have heard about a Bitcoin ATM somewhere, but I’m unsure if that would work in my case.

I also tried blockchain, but the bank didn’t send the cash.

Orphaned blocks

Is there orphaned blocks in blockchain?

I mean a database of full node. Is it true that orphaned blocks (that outside the mainchain) already are in blk00*.dat files?