{
  "manageEntity": {
    "action": "Save",
    "entityId": "380478",
    "entityType": "Track",
    "nonce": "0x2c09f1aa8bbc209a25ad458a808f39740c3ad36d5a6700c9688f5faded27db84",
    "signature": "0x028c99470b3bb2db63d13700002b58a3a2fc92e0f7ae65a3407e58a8b81d199b35b1d54ae64011e97d5b4ffed5851f9de772e6673c32e850b02e59ffaacbe0181b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}