{
  "manageEntity": {
    "action": "Save",
    "entityId": "147443",
    "entityType": "Track",
    "nonce": "0x12e29b4be43fefb53388b055edb31708e67f8dcfe1cc4bbd374a7be100bb9d73",
    "signature": "0x3298d6c4a7d89da7487968e084319577ec8abf7bb73c31ce2c85891c621b76ad312230b4263077e0c215a66fda72ea4b82fe438dbc8d06fedebb916683548c831c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}