{
  "manageEntity": {
    "action": "Save",
    "entityId": "905560690",
    "entityType": "Track",
    "nonce": "0x14b1d2f229a68dd1a28340dcab6775573b2d1200b1157badde18f72af2f05a1e",
    "signature": "0x0c405da0f57f81aca81161e38bcce449a767e6b92813597d67e7028f6dcb37f0017ba37f769f5e0d87cb3bbc40803fdab8c262048069d36f71a6f9de168121521c",
    "signer": "0x7f590bEFD43b7cCcF038372CE50C813B4290A5f4",
    "userId": "297301449"
  }
}