{
  "manageEntity": {
    "action": "Save",
    "entityId": "18804",
    "entityType": "Track",
    "nonce": "0x16ca8d08c2e22fbc152831e06675d3aab5b4d39d51cb2bb6be91f848990f4a10",
    "signature": "0x5beb24fd0e2fff33e6fa86a7d8cd7fc66989603ccaa59b61a3de809eaaac2482475e18d5f57544b398c923061f5fb1b93e4c16a491063714775a14f777be0a741b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}