The IoP blockchain is considered irreversible, so the project has already started. The core client is a fork of bitcoin 0.13 + additional functionality that we incorporated (whitelisted miners, minerCaps, premined, etc. you can read more on our technical document linked above.).

We are currently developing the Contribution Contract and Voting functionality into the blockchain. Segwit will be incorporated at some point after that.

Thanks,
Rodrigo

Hi, very interested in knowing how to sign the block to allow miners with an specific private key.
Can you give more info about this?

This is a very old post!

Hey, I was able to fix this myself.
I'm posting the solution just in case anybody need it in the future.

As previously stated, after creating an altcoin cloned from bitcoin, I was unable to start mining (even using CPU miner) because getblocktemplate RPC returns downloading blocks.

Since just after I started my new alt coin I only have the genesis block, I was unable to get mining info from the core client to generate additional nodes.

I solve it by cloning the 0.9 branch of bitcoin with the same parameters I used to generate my alt coin.
In version 0.9, the internal bitcoin core miner is enabled and will start mining the first block every 10 minutes.

After I generate a few blocks, I turned again to version 0.12 and minerd miner was able to execute getblocktemplate and start mining blocks.

Hopes it helps!

Hi Everyone, I just cloned bitcoin to create my new alt coin for learning purposes. Let's say "stratocaster".

I have been able to generate the Genesis block, run instances of stratocaster-qt and stratocasterd program without issues
and I have two local instances connecting to each other.

if I do stratocaster-cli getblockcount I have 0.

if I do stratocaster-cli getblocktemplate I have the message "is downloading blocks..."

I can't execute getwork RPC method because I used the last bitcoin version to clone, so that is deprecated.

I'm using parameters gen=1 and genproclimit=-1 in stratocaster.conf file but nothing is being mined.

I also try to start using minerd (or CPU miner) but since getworktemplate is not working, I'm unable to use it.

It's like I can't mine to get new blocks because I only have genesis block.
Has anyone know what I could try next?

Please help!

Even this is old and I forking the 0.12.1 version which has some changes to the script you posted, This have been an excellent guide. Thank you.
But...I'm stuck right at the end.

I have been able to get the hash of the Genesis block, compile it and install it on three VMs on AWS and they connect between each other without issues. However, I'm not able to mine and generate a new block, neither in MainNet or TestNet. I have tried mining using differents miners (CPU minerd and CGMiner, even by setting the gen=1 parameter of the newCoin.conf of newcoind).

The problem is that miners are using the getblocktemplate RPC parameter and the client replies downloading blocks...
I only have one checkpoint added as you described in the chainparams.cpp file.

I'm able to mine without problems in regTest.

What am I doing wrong?

--Edit on this: after exactly one month!
I fix this by cloning the bitcoin client on version 0.10 instead of using 12.1. I think that in version 12.1 the internal bitcoin core miner is disabled so I was not able to mine by using the core client alone. In version 10, I had hashing power with the core client and able to mine some coins. After that, I was able to use the 0.12 core client without issues.

Thanks!

Hi there, I know this is super old, but I didn't search for help when I used bitcoinj on android an had several problems using Android Studio.
The error was: " Failure [INSTALL_FAILED_NO_MATCHING_ABIS] "

It depends on the Android device used (or emulated) but the problem is with the Scrypt library.

I was able to fix it by adding this exclussion at the build.gradle file of the Android project.

        exclude 'lib/x86_64/darwin/libscrypt.dylib'
        exclude 'lib/x86_64/freebsd/libscrypt.so'
        exclude 'lib/x86_64/linux/libscrypt.so'
        exclude 'org/bitcoinj/crypto/cacerts'


Then adding bitcoinj to Java modules in Android Studio works just fine.
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'org.bitcoinj:bitcoinj-core:0.13.3'
    testCompile 'junit:junit:4.12'
}

Hopes it helps someone!