{
  "manageEntity": {
    "action": "Save",
    "entityId": "1894740796",
    "entityType": "Track",
    "nonce": "0xc568547a27dff60fbc2bb5a202bda2c822046f6006c2b0028bc70ce9e447aced",
    "signature": "0xe4a2274c162f3705478d2640c4112a25716f4a43ea7fc022818bddd93052e31126eca3481e01dc3dc4204a060e8f9a85959bd1f8c9aa8990deeefade87e132851c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}