{
  "manageEntity": {
    "action": "Save",
    "entityId": "1533048716",
    "entityType": "Track",
    "nonce": "0x5432fe1317fd9b3ff3b0b7190930dd3a577b5891f9f8d90e15b897aacb1208a9",
    "signature": "0x48cfb2c1d21f537044ff1f369654aab66b64d58cc063f4d4585ebcd79cda84ab3c38077b723dbd54fa4f2f1c596a9340e2812488e1e76f4b5c2b49b1cc96d92b1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}