{
  "manageEntity": {
    "action": "Save",
    "entityId": "31221159",
    "entityType": "Track",
    "nonce": "0x5c84547d2b98d2a194e71e7bffafafbd550d9ff7aed5ab06030211b990fcf3c2",
    "signature": "0xd9ccee69c2630c8989020617fcdb13f63f610e4d950e23b0a0b8a10613d8bfc8597520ab67e2b14b37d3f243bc5086654284dd7e9146e4ea7146367ffe02c9861c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}