{
  "manageEntity": {
    "action": "Save",
    "entityId": "1306964621",
    "entityType": "Track",
    "nonce": "0xda9887df4db5fd370a7c4cd7f76e573ce26ec8eb3f36c4adf04be1b0e3947548",
    "signature": "0xaf4b20c39f7a3113f3dd5ac846fc912a2670835273cf34cf7891bd7d66e15ecf108e4d2592b9db225883063a00edfd79cfb82a1dc723a0198f726d051b840fda1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}