{
  "manageEntity": {
    "action": "Save",
    "entityId": "1389550150",
    "entityType": "Track",
    "nonce": "0x51386f02cd8b25f0465f0aa84b08a11763ca8f0ca11b08e87baee42338b7701d",
    "signature": "0x8e5fc1fa6188a1c51180e24bc71f13bdb35ecb1473daf7b230aa9593c207f6c52a6b3d38971efdb4f2f1295a8adf499114d6f19a9b0436d9d5ceac0b3ec4639a1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}