{
  "manageEntity": {
    "action": "Save",
    "entityId": "1374546712",
    "entityType": "Track",
    "nonce": "0x7f3515bdd43eb5deeafe1d2e2b7dc98c99a60d2bc12b8a24d7d6acffc5b440e5",
    "signature": "0xb3524417236e4ff00351eef25b9f17ff2db04c65a456c6c9d3371cc504e91f3a2f3251cea3ac45781b307f08f293bf5c34080e8f9506fa53874448a757c58c6c1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}