{
  "manageEntity": {
    "action": "Save",
    "entityId": "212833912",
    "entityType": "Track",
    "nonce": "0xc2b14e478b7389431b6dc643f749c934da999e7fed134e3fc9510803d91f31ee",
    "signature": "0x826869aeddf5cbb305840f462ffa7bfb7cf659c22a7e08fa01ab573d315457ce64adbc1aa871625883f0c1667b5a1c287d4e0a32e34d5c019f25bf85f0b15ede1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}