The ICANN policy can be found at https://www.icann.org/resources/pages/transfer-policy-2016-06-01-en
The Transfer Policy allows Registrants to delegate giving their consent to a Change of Registrant to a third-party on their behalf. The policy defines such third-party as a Designated Agent (DA):
1.2 “Designated Agent” means an individual or entity that the Prior Registrant or New Registrant explicitly authorizes to approve a Change of Registrant on its behalf.
In practical terms, this means that a Registrant can give authority to LekkiHost to confirm a Change of Registrant. When LekkiHost is enabled to act as a Designated Agent, the Registrant will not need to receive or confirm an email in order for a change to proceed. Instead, LekkiHost will always auto-approve any Change of Registrant.
More details here:- https://www.icann.org/resources/pages/transfer-policy-2016-06-01-en