{
  "manageEntity": {
    "action": "Save",
    "entityId": "437829",
    "entityType": "Track",
    "nonce": "0x8494753fa3f69f8440e40f347f3951f5e1e11646ea72bc6d917d3bfd0714593e",
    "signature": "0xbd8f3a8eeb1662e81a09bd3074dd6121bc10bb559f2e9b50d650e13955932ea9293651b93081fe7d4821279e394b1febe7e21f04390cc4e6b56209361c281b0e1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}