{
  "manageEntity": {
    "action": "Save",
    "entityId": "878258504",
    "entityType": "Track",
    "nonce": "0xe4b3c3e8e64fe0503fad3e9ce7097429d485ca50ac518cade7fc9a1a86e0abb0",
    "signature": "0x43f2a8f10c48c2bfbbef3859d0392e64029b68a5cefb4eeedcefb5f00bddd8a2513985558c6f6c251d7242f61604cd122b726df12c978f7d5b9816b794831bdf1c",
    "signer": "0x56D42B79b21D81D9402f53017C457dBd831591B5",
    "userId": "918223593"
  }
}