current_transactions are not proofed
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Description
in line 212,current_transactions are appended by rewarding coin,and this tamper the current block hash.
In Bitcoin,the current_transactions is proofed by proof of merkle_root.
Proof-of-Work function seems only solve the synchonze problem but not solve the fake transaction problem.
https://github.com/dvf/blockchain/blob/1369cac2094d36e694da1209d7d4f923264f7f50/blockchain.py#L212
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