{
  "manageEntity": {
    "action": "Save",
    "entityId": "857463327",
    "entityType": "Track",
    "nonce": "0x7af4ca0d2a874b2649307f7266b26e63abf996c8ecaeeddcd7ca75d5fb1a7d8f",
    "signature": "0x4e2b4e1e22bbf5fee8d874d06a5b13cddb32454d51d5818d0773ee04b7d92cf14139d9e6634bfbb70cbb6d0ec610dc4b08173e45f245ab6dcec347791b04f4fd1b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}