Brings service functions to sign Ethereum contract transactions

[denbite]

Resolves #21

[gagdiez]

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@gagdiez	8

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[gagdiez]

@race-of-sloths score: 8

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🔄 The PR has been merged.

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[gagdiez]

@race-of-sloths score: 8

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@race-of-sloths score 8

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✅ PR is finalized!

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