{
  "manageEntity": {
    "action": "Save",
    "entityId": "973452",
    "entityType": "Track",
    "nonce": "0x3a5256c529b8bdbc223823d391c450b6e580f850fac59c158c9039a6e202fb01",
    "signature": "0x8ced3753b476f292d247702e436148846b180a36a739fb66b2f7daab0013d1df4e33070ed2ee22c9751a0320dda3625a5e00e0b02299469b07ddb0132d31d02e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}