{
  "manageEntity": {
    "action": "Save",
    "entityId": "1272596415",
    "entityType": "Track",
    "nonce": "0xc905ac07743818302e95b405913b7180754b11344c44b06955a0b2738fb47f57",
    "signature": "0xe59b6c879b8c97558032acc7a8c9a67bed61c0675844884d8b5414c67d7967513f75cbf57544cfbfc615f13b70907089d31c841c3f703bb0b49e236e6633726e1c",
    "signer": "0xc28F39d473d5C4cacc612630A8798a119D1Bb506",
    "userId": "901788935"
  }
}