{
  "manageEntity": {
    "action": "Save",
    "entityId": "428398",
    "entityType": "Track",
    "nonce": "0xe42ed1949f3f9d2d5ebba36257fe7a4889da01054c681793b123a6ac009376aa",
    "signature": "0xaa1431959c813549329f2e0fc4364762ebc068fc8807bc70e2eb357b0eda264c0c5231627c074fde661e8450e9820b477c6c7fdb980ae84c3f3bf6535e8d1e901b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}