A Blockchain-Based User Authentication Scheme with Access Control for Telehealth Systems

Algorithm 1

Subscription service contract.

	function uploadSubs(, , )
	if userExists  = = false
	expiretime = time.Now().Month() +
	service = Service \{, , expiretime\}
	return putState(, service)
	else
	return Errorf(“the user has already exists”)
	function querySubs(, )
	err, result = getState
	if (err = = null)
	return result
	else
	return err
	function updateSubs(, )
	if userExists  = = true
	expiretime = time.Now().Month() +
	service = Service \{, , expiretime\}
	return putState(, )
	else
	return Errorf(“the user does not exist”)