# Resistance to Manipulation

At this point, we plan to use Ethereum Blockchain, so here we explain about manipulation of Proof of Thanks and ARIGATO CREATION, not the manipulation of Blockchain itself.

Please note that the logics in this section are not definite and should be revised accordingly to the growth of the services. As for revision, it is supposed to be performed by users’ vote.

**Sybil Attack**

Sybil Attack is an act that one entity raises the value of Proof of Thanks improperly using multiple nodes and attempts to acquire increment by ARIGATO CREATION.

The countermeasures against Sybil Attack include followings:

| Require identity verification before cashing                               |                                                                                                                                                                                                                                                                                                 |
| -------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Improve tolerance to attack with Proof of Thanks logic                     | <ul><li>Impose penalties on transactions</li></ul><p>•where the account balance fluctuates</p><p>greatly</p><p>Remittanceaccount balanceof</p><p>•toofluctuatessmall amountgreatlywill gain 0</p><p>Consider(zero) ProoftheofactivitiesThanks of other nodes by Pay-it-Forward Volume score</p> |
| Reduce motivation to attack by setting a maximum limit of ARIGATO CREATION |                                                                                                                                                                                                                                                                                                 |

Loop Attack

In Loop Attack, which is a variation of Sybil Attack, an entity repeats remittance between multiple nodes, attempting to raise the value of Proof of Thanks improperly. For Loop Attacks, we are considering countermeasures to raise the cost of Loop Attack by the detection algorithm in addition to the measures against the Sybil Attack mentioned above.


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