{
  "manageEntity": {
    "action": "Save",
    "entityId": "755126",
    "entityType": "Track",
    "nonce": "0xf3fa8b90750e6f8520ac4d781f0fff9970f076aafb83fe09ba4881164e5b7de2",
    "signature": "0x5d2dcd9b601cd741fe5771c5b98f2e376f194b91ccb174c47ecb5e03e9f0d24e713bedb493f7bdf86c5974125ea7430dfe7c6e2e93ed6030b2713c1c3611a9641c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}