{
  "manageEntity": {
    "action": "Save",
    "entityId": "910739831",
    "entityType": "Track",
    "nonce": "0xaff7ffe417d0725e675135806e2921135ee7cef1fc68b864de5ac66b77590c0f",
    "signature": "0x302391b06a060ccfdcbba32d836c3391ed16c8e64d616335f443b897992abbaa46def6658a655eebb3f9ce963253c94114ad2ed0732b885deb77d654704eb5651c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}