{
  "manageEntity": {
    "action": "Save",
    "entityId": "673815",
    "entityType": "Track",
    "nonce": "1789891568204183600",
    "signature": "0x434e6e7308955058433f6f327ea1fd0b70d63b2b29d042ef36ae59faf1df43bc5d938866a7acc1fc4f8116c9308107129a32e132572f6667f190e0cf79792e471c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}