{
  "manageEntity": {
    "action": "Save",
    "entityId": "899789441",
    "entityType": "Track",
    "nonce": "0x7953f17582b067e84ee35f0cee33be238db5ef57bdecf235f83eafa2a5e39d46",
    "signature": "0x9df0f7eb363b7709d9640ba033bfc1facbb798aa5b006bbf3f7d982ba3e1a5b041fc01a3618a63a6c59813343dc1f3cbaf64e288a891bdbfc0137de33870723a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}