{
  "manageEntity": {
    "action": "Save",
    "entityId": "1518260724",
    "entityType": "Track",
    "nonce": "0x3cb7d15d9c3481faa8524ebab2ac889bc62197328e25fe59a5205eabb176eec5",
    "signature": "0x91f53ad800f5ac38c03b601f4ae56b3a3b5e203b47eed6e0392b73f88a3291684f33b3b69f6497a98d4f0a9087b90393752e8d5b0d2b162494005d29ae1eb28e1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}