{
  "manageEntity": {
    "action": "Save",
    "entityId": "221399",
    "entityType": "Track",
    "nonce": "0x3c4fdac7794e933323161761afba268aebf0c7fc2f15a4924a27cc073da0cbee",
    "signature": "0x4f35e36329cef77334ce7f547d10133725095f84039e1b0cf0bae70be7366e26251014e1de56ce196353f8b014d2489fbe8cbbe6e5ef7663fa666a32297be1861b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}