Śrī Madhvācārya has brought our attention to this quotation from the Nārāyaṇa-saṁhitā:

"in the Dvāpara-yuga one could satisfy Kṛṣṇa or Viṣṇu only by worshiping opulently according to the pāñcarātrikī system, but in the age of Kali one can satisfy and worship the Supreme Personality of Godhead Hari simply by chanting His holy name." Cc. Antya 7.12

2. In this Age of Kali,real religious propaganda should induce people to chant the Hare Kṛṣṇa mahā-mantra. This is possible for someone who is especially empowered by Kṛṣṇa. No one can do this without being especially favored by Kṛṣṇa. Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura comments in this regard in his Anubhāṣya, wherein he quotes a verse from Nārāyaṇa-saṁhitā:

"In Dvāpara-yuga, devotees of Lord Viṣṇu and Kṛṣṇa rendered devotional service according to the principles of pāñcarātrika. In this Age of Kali, the Supreme Personality of Godhead is worshiped simply by the chanting of His holy names."
Cc. Madhya 25.9

3. Learned scholars in the age of Kali worship Lord Krsna throught nama-sankirtan:
"By performing the sacrifice of congregational chanting of the holy name, learned scholars in the Age of Kali worship Lord Kṛṣṇa..." Stava-mala of Rupa Gosvami
(Cited » Cc. Adi 3.58)

4. In Kali-yuga, the process of worshipping Krsna is the sacrifice of chanting the holy name:

(Lord Caitanya to Svarupa Damodara & Ramananda Raya): "In this age of Kali, the process of worshiping Kṛṣṇa is to perform sacrifice by chanting the holy name of the Lord. One who does so is certainly very intelligent, and he attains shelter at the lotus feet of Kṛṣṇa."
Cc. Antya 20.9