{
  "manageEntity": {
    "action": "Save",
    "entityId": "487473387",
    "entityType": "Track",
    "nonce": "0x033069176a0cd8494cbe129267b231a9a22eb915febfd77a7b95eb4cf0833c39",
    "signature": "0x72426068e17a3f74561af7fc2282e0e668f8e81fbd4c6df7cd5c5a4dea9e46f61d3690ba622066b14a19872901adfe6e14c93a4039d7ee3f6aeef79bec644c521b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}