{
  "manageEntity": {
    "action": "Save",
    "entityId": "1879567669",
    "entityType": "Track",
    "nonce": "0x190317235cd3d0474f88b1ef763d495b9ae8ba3c542ee1786dac36fd6f7e0e83",
    "signature": "0xa3887e0c7b021848ce7086465500a8e3dfd78944f31a0d12167f188078fa1f866e5dced057f2b478ec7b45e46c49fdd8031e8361416a03d744f59b72fcd2493e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}