{
  "manageEntity": {
    "action": "Save",
    "entityId": "444395723",
    "entityType": "Track",
    "nonce": "0xfa9cc182ddf6cc37a10be06012d6ef03150795217affdd077eceb69f64d19be4",
    "signature": "0x17d56581e87431c65231facd40c6fc877c4e385f5b7d964074177dce0c212ccc1cd3c3b0fecf05fe97d7ecb65d621860b15401f9d7217e01d21a73ccaf5a0fdd1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}