{
  "manageEntity": {
    "action": "Save",
    "entityId": "125460",
    "entityType": "Track",
    "nonce": "0x289c3383e5ebec16744f18ea840617916e21dcbc177480935f160e2080bd2d3a",
    "signature": "0xde53ac930276c409e7f61a4725648af9e386faa748b6e3e1ffcc8488c74277962fd32c1e7f9643804f030cae18c863f4c56bfb608137bea2302b37ac93b693931b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}