Validators are independent physical persons or entities - not part of the Ambire AdEx Platform, who are responsible for tracking ad impressions/clicks and cryptographically signing confirmations of the impressions/clicks/earnings. Validators derive information about impressions/clicks via the Ambire AdEx AdView module, and the validators assigned for both parties receive the exact same information directly from the AdView.
Once the transaction is verified by majority of assigned validators and recorded on the payment channel, it cannot be changed, reverted or manipulated. There is clear proof of the transaction which inevitably provides stability and guarantee for the advertising parties.
A validator stack is a collective term for all off-chain components responsible of handling events, managing OUTPACE channels and generating analytical reports.
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