{
  "manageEntity": {
    "action": "Save",
    "entityId": "988930090",
    "entityType": "Track",
    "nonce": "0xfab9796afa012c6a311c9f3f1ce2d91ba5b3b65cb462afa9c23aef0e3beb6ed1",
    "signature": "0xa4a998b3ad9facd595b1e6c292953fd8c771a506646a905b4a41844c25aedf21617f47cb8d6380ab1594f202ee0812373732d749830e32b8dca9481156b9c35f1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}