{
  "manageEntity": {
    "action": "Save",
    "entityId": "1385945420",
    "entityType": "Track",
    "nonce": "0x1837a710737508d5c9c5d56236a9e03e445be40602087efe7e646719e8ca5137",
    "signature": "0xf7ac510fca6d5925626a48ff39851c5aee0de10c910659fad054ff695d1f92ed7e8811088b91947a239d56c0977b93edc2d9b6a9d32528a89a75e8e940a1a6111c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}