{
  "manageEntity": {
    "action": "Save",
    "entityId": "581417",
    "entityType": "Track",
    "nonce": "0x70fe1d390e1a4d9b0043366c7b354118a86e469223d447f0ef2743d04784e52c",
    "signature": "0x0bf4150887d58647f170e7fa3a0d3d25a07e167986f91c084f20f11123d0435f2237152adbc97471abdd3a7ca09e744a334f3611300f6792e765d6d5fc574ce51c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}