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Does eosio also sign the transaction with the ricardian contract of user consent and/or how does the application proove that a party agreed on said ricardian contract?

I have integrated the ricardian contract with the ricardian template toolkit but do I have to save the user's consent? Because how would the application proove validity if the ricardian contract in the ABI file changes?

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Everytime you update the ABI file, a record is stored on chain. The action is eosio::setabi. Therefore it would be possible to say which version of the ABI file was current on the blockchain at the time of a transaction being signed.

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