{

this->difficulty = 3;

this->transaction_capacity = 4;

{

this->difficulty = difficulty;

this->transaction_capacity = 4;

{

this->difficulty = difficulty;

this->transaction_capacity = transaction_capacity;

{

this->mpool.add_transaction_to_pool(transaction);

/* create block if mpool has 4 transactions */

if (this->mpool.size() == this->transaction_capacity) {

vector<string> slice(mpool.transaction_pool.begin(), mpool.transaction_pool.end());

if (this->blocks.size() == 0) {

this->set_genesis_block(slice, miner_id);

}

else {

this->add_block(slice, miner_id);

}

this->mpool.clear();

return 1;

}

return 0;

{

string null_hash = "";

for (int i = 0; i < 64; i++) {

null_hash += '0';

}

Block genesis_block = Block(

transaction_slice, null_hash, this->difficulty, this->transaction_capacity, miner_id);

this->blocks.push_back(genesis_block);

{

Block last_block = this->blocks.back();

return last_block.give_hash();

{

/* mines for a new block */

Block new_block = Block(transactions,

this->give_last_hash(),

this->difficulty,

this->transaction_capacity,

miner_id);

this->blocks.push_back(new_block);

{

if (!this->blocks.size()) {

return true;

}

Block prev = blocks[0];

for (int i = 1; i < blocks.size(); i++) {

Block curr = blocks[i];

if (curr.give_prev_hash() != prev.give_hash())

return false;

prev = curr;

}

return true;

{

for (Block block : this->blocks) {

block.display();

}