{
  "manageEntity": {
    "action": "Save",
    "entityId": "201574",
    "entityType": "Track",
    "nonce": "0xaa9a3d2be6f6a8ed2ad2a1847b48d7669ae6a1d65db5c16cffeac5399e518ca7",
    "signature": "0x59ec7331a9f0416b0e930981f3366ded83e9503bff9bcc0e9dfe2f1d4942e1f1288abf3b7d3bb794a38774b533fdfad5893247a9b4b66ba9e49341117a4665e81c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}