Līlāśuka is Bilvamaṅgala Ṭhākura Gosvāmī. He was a South Indian, a brāhmaṇa, and his former name was Śilhaṇa Miśra. When he was a householder, he became attracted to a prostitute named Cintāmaṇi, but eventually he took her advice and became renounced. Thus he wrote a book named Śānti-śataka, and later, by the mercy of Lord Kṛṣṇa and the Vaiṣṇavas, he became a great devotee. Thus he became famous as Bilvamaṅgala Ṭhākura Gosvāmī. On that elevated platform he wrote a book named Kṛṣṇa-karṇāmṛta, which is very famous amongst Vaiṣṇavas. Since he exhibited so many ecstatic symptoms, people used to call him Līlāśuka.
(Sri Caitanya Caritamrta-----2:2:79-----purport).

At the village of Uḍupī He saw the Gopāla Deity installed by Śrī Madhvācārya. He then defeated the Tattvavādīs in śāstric conversation. The Lord next visited Phalgu-tīrtha, Tritakūpa, Pañcāpsarā, Sūrpāraka and Kolāpura. At Pāṇḍarapura the Lord received news from Śrī Raṅga Purī that Śaṅkarāraṇya (Viśvarūpa) had disappeared there. He then went to the banks of the Kṛṣṇa-veṇvā River, where He collected from among the Vaiṣṇava brāhmaṇas a book written by Bilvamaṅgala Ṭhākura, Śrī Kṛṣṇa-karṇāmṛta. The Lord then visited Tāpī, Māhiṣmatī-pura, the Narmadā River and Ṛṣyamūka-parvata. He entered Daṇḍakāraṇya and liberated seven palm trees. From there He visited a place known as Pampā-sarovara and visited Pañcavaṭī, Nāsika, Brahmagiri and also the source of the Godāvarī River, Kuśāvarta. Thus the Lord visited almost all the holy places in South India. He finally returned to Jagannātha Purī by taking the same route, after visiting Vidyānagara again.
(Sri Caitanya Caritamrta-----2:9----summary).

The brāhmaṇa community there was composed of pure devotees. They regularly studied a book entitled Kṛṣṇa-karṇāmṛta, which was composed by Bilvamaṅgala Ṭhākura.
(Sri Caitanya Caritamrta-----2:9:305----translation).

There is no comparison to the Kṛṣṇa-karṇāmṛta within the three worlds. By studying this book, one is elevated to the knowledge of pure devotional service to Kṛṣṇa.
(Sri Caitanya Caritamrta-----2:9:307----translation).

One who constantly reads the Kṛṣṇa-karṇāmṛta can fully understand the beauty and melodious taste of the pastimes of Lord Kṛṣṇa.
(Sri Caitanya Caritamrta-----2:9:308----translation).

The Brahma-saṁhitā and Kṛṣṇa-karṇāmṛta were two books that Śrī Caitanya Mahāprabhu considered to be most valuable jewels. Therefore He took them with Him on His return trip.
(Sri Caitanya Caritamrta-----2:9:309----translation).

Śrī Caitanya Mahāprabhu gave Rāmānanda Rāya a vivid description of His travels to the holy places and told him how He had acquired the two books named Kṛṣṇa-karṇāmṛta and Brahma-saṁhitā. The Lord delivered the books to Rāmānanda Rāya.
(Sri Caitanya Caritamrta-----2:9:323----translation).

Indeed, each and every Vaiṣṇava copied the two books. By and by, the two books (the Brahma-saṁhitā and Śrī Kṛṣṇa-karṇāmṛta) were broadcast all over India.
(Sri Caitanya Caritamrta-----2:11:143----translation).

“"O my Lord, the transcendental body of Kṛṣṇa is very sweet, and His face is even sweeter than His body. But His soft smile, which has the fragrance of honey, is sweeter still.""
This verse is quoted from the Kṛṣṇa-karṇāmṛta (92), by Bilvamaṅgala Ṭhākura.
(Sri Caitanya Caritamrta-----2:21:136----translation and purport).

"O my Lord, if one engages in Your pure devotional service with determination, You become visible in Your original transcendental youthful form as the Supreme Personality of Godhead. As far as liberation is concerned, she stands before the devotee with folded hands waiting to render service. Religion, economic development and sense gratification are all automatically attained without separate endeavor." (Kṛṣṇa-karṇāmṛta 107)
(Sri Caitanya Caritamrta-----2:22:21----purport).

“"O Kṛṣṇa, O flute-player, the sweetness of Your early age is wonderful within these three worlds. You know My unsteadiness, and I know Yours. No one else knows about this. I want to see Your beautiful, attractive face somewhere in a solitary place, but how can this be accomplished?""
This is a verse from the Kṛṣṇa-karṇāmṛta (32).
(Sri Caitanya Caritamrta-----2:23:31----translation and purport).

“"O my Lord, the transcendental body of Kṛṣṇa is very sweet, and His face is even sweeter than His body. But His soft smile, which has the fragrance of honey, is sweeter still.""
This is a verse quoted from Bilvamaṅgala Ṭhākura's Kṛṣṇa-karṇāmṛta (92).
(Sri Caitanya Caritamrta-----2:23:35----translation and purport).

The Lord especially liked to hear Bilvamaṅgala Ṭhākura's Kṛṣṇa-karṇāmṛta, the poetry of Vidyāpati, and Śrī Gīta-govinda, by Jayadeva Gosvāmī. Śrī Caitanya Mahāprabhu felt great pleasure in His heart when His associates chanted verses and sang songs from these books.
(Sri Caitanya Caritamrta-----3:15:27----translation).

Śrī Caitanya Mahāprabhu said, “"Alas, what shall I do? To whom shall I speak? Let whatever I have done in hopes of meeting Kṛṣṇa be finished now. Please say something auspicious, but do not speak about Kṛṣṇa. Alas, Kṛṣṇa is lying within My heart like Cupid; therefore how can I possibly give up talking of Him? I cannot forget Kṛṣṇa, whose smile is sweeter than sweetness itself and who gives pleasure to My mind and eyes. Alas, My great thirst for Kṛṣṇa is increasing moment by moment!"
This statement by Śrīmatī Rādhārāṇī is quoted from the Kṛṣṇa-karṇāmṛta (42).
(Sri Caitanya Caritamrta-----3:17:51----translation and purport).

Śrī Caitanya Mahāprabhu passed His nights tasting the meaning of the Śikṣāṣṭaka prayers in the company of Svarūpa Dāmodara Gosvāmī and Rāmānanda Rāya. Sometimes He recited verses from Jayadeva Gosvāmī’s Gīta-govinda, from Śrīmad-Bhāgavatam, from Śrī Rāmānanda Rāya's Jagannātha-vallabha-nāṭaka or from Śrī Bilvamaṅgala Ṭhākura'sKṛṣṇa-karṇāmṛta. In this way, He became absorbed in ecstatic emotions. For the twelve years Śrī Caitanya Mahāprabhu lived at Jagannātha Purī, He relished the taste of reciting such transcendental verses. Altogether the Lord was present in this mortal world for forty-eight years. After hinting about the Lord's disappearance, the author of the Caitanya-caritāmṛta gives a short description of the entire Antya-līlā and then ends his book.
(Sri Caitanya Caritamrta------3:20-----summary).