{
  "manageEntity": {
    "action": "Save",
    "entityId": "728365",
    "entityType": "Track",
    "nonce": "0x826af7d7a7ce45f97a067ab242e2a3b850d3fdb880293854670039308bfa3bb7",
    "signature": "0x43ae833ef1ccf0939da5daf9c6acc8bfa3a00f4c5f9cb6328ae3297ceb730e8e4a0ce522fca5bfd17e330025b248dba4c0cc3ecbe23e2f17432f272c8a0659d91c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}