{
  "manageEntity": {
    "action": "Save",
    "entityId": "1281012873",
    "entityType": "Track",
    "nonce": "0x5a4af7cc3a0259b6e30e86a99de0a400a3cbc65a5512f0c67c8514071364da23",
    "signature": "0x143e542ba7e45342c9966fdc017bece8bce74c1e142b6eaea82b865c06292a5c5dda02043db87edf038fd239510511f1012534559ec44a7838c3e4f5d7485fae1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}