{
  "manageEntity": {
    "action": "Save",
    "entityId": "518737221",
    "entityType": "Track",
    "nonce": "0xea33e682469e5b410287b2583af6a053b0b7bfde013c696d9f686e2e3f8140e0",
    "signature": "0x439df7c2474df9df6d0e483d9b6f7b2c1b8e3457b19afa236bab0ad215e048b23d83781ea1dcb1f63b2b42e54f8fee2f0ad4cc88082d878b2269be7d589b62e41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}