{
  "manageEntity": {
    "action": "Save",
    "entityId": "544487345",
    "entityType": "Track",
    "nonce": "0xbd9fe25c562b4613c3b18004d92aafd6d8b0d71f309b5ff48cea27a643a3c58d",
    "signature": "0x27fe2d0a1b8cb4317164640d1e0baf5c447dda45c421fd02bb39188119f458394e4a8d2d1b0049d813bfe2b6206c8b54bbfb866bb943b62bd23f367bf199358b1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}