{
  "manageEntity": {
    "action": "Save",
    "entityId": "813938566",
    "entityType": "Track",
    "nonce": "0x708539ef0b80902184e7a1e6ae05cccf58e99735606135fe233c9476e7c56dc2",
    "signature": "0x3a1cb43d08e3a6410dd66937c341ead0f9f87dc38042a8d8b30d16dcf4f2ac434d9d591f814890a6a9dee29eb16c095109f52cf0ba3dbbf9a046de18508d030a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}