{
  "manageEntity": {
    "action": "Save",
    "entityId": "210705",
    "entityType": "Track",
    "nonce": "0x4270bd4ec81fde9c267f27a05807c1dbdb0e6ea86d1db7b2f05e16356e5606f1",
    "signature": "0x03ce0339465f749d21db2fb9de39ed7de240929dc5d88a7b419894e3a78665b04e2bc59a4bf644c2758483cb2c9861db9e3f75a4145a6b2f1cf1354e882254661c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}