{
  "manageEntity": {
    "action": "Save",
    "entityId": "983107",
    "entityType": "Track",
    "nonce": "0xfc2ed579ee5d35230c87dbedd5d1778483cfc0ff58f756e30b39414a24af60a1",
    "signature": "0x430ba4863a8a48e82c6d333f6876fb13aba3739d69b3ef4c71fdb26bfcdec5db402decc00dd3ecbcb82d7478ff35e1bd87ffcd0a0f8d806150aac9dedd6982461b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}