{
  "manageEntity": {
    "action": "Save",
    "entityId": "457624356",
    "entityType": "Track",
    "nonce": "0x62c97b445fa10034ff636e56503c33ab0941392be48939f7985654eaa5b8941c",
    "signature": "0xf130fdfdd93683ba50ac407df69cc994ece1bbfd76b88c81630cafc3e05b769e4905217725e0c33b0c832d59db31432c8163dd965286a584ae8c3baf23c058871c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}