{
  "manageEntity": {
    "action": "Save",
    "entityId": "411469",
    "entityType": "Track",
    "nonce": "0x40c947bd055e892322afd146cf0c75bea4b7809a3cdaea8a2447e122c0d82366",
    "signature": "0xe6dd1a6ef9e0ea7b58b3626301d32161d346b75bda708e7feb558051ac80e42112dafbb237b9775fdd1b6d321766b25ebfbd743314abe26f2f37680fa13e92ff1c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}