RPC-API
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First iteration
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Web server that receive requests for transactions. Right now it receives to types of requests: POST for adding a tx to the mempool and GET for getting the state of and specific transaction recently added.

Second iteration
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When a new transaction is created it passes the tx hash and the hash as the txpool api requires it.

It also has a new endpoint `get_block` which requires a block hash and returns the content of the block that has the same hash or an error if it doesn't exists.