Rollback new signing mechanism

[zemyblue]

Summary

Rollback new signing mechanism

Problem Definition

#258 's feature has the potential for a DDoS attack. If there is no gas fee for the chain, an attacker can generate a lot of traffic by generating a lot of keys and sending tx.
Even if there is a gas fee, a tx sender need to receive coins from someone because sender need to have a certain amount of coins to pay for gas fee. At this time, since accountNumber is created in the existing system, there is no case where tx can be transmitted without accountNumber. So there is no need for a new signature mechanism using the existing sig_block_height.

Proposal

Rollback #258 issue (fixed by #265 )

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[zemyblue]

We need to revert #293 by fixed #344.