{
  "manageEntity": {
    "action": "Save",
    "entityId": "957787464",
    "entityType": "Track",
    "nonce": "0x35f8187a2ae8be471bc10d2e6c72d7c6489faacd182528e1da9728785dc1ed4f",
    "signature": "0xa4f6ef1b3ced363f0d030c8e08c76d21bf5f6cdedef4c620d04356ab30770f3045a478e1dda91ee4028a525cf0ce733c7dd7a5405b8ff61be698500cd7cb42231b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}