{
  "manageEntity": {
    "action": "Save",
    "entityId": "879366580",
    "entityType": "Track",
    "nonce": "0xb4c3f6c193c77dbf0a3afeadcdd6e7feb92e1ee3568e0817a7f1be2068eb663e",
    "signature": "0x81d7c22ca79a8f61dfa4cc1203164ba721e6886cdcedb247ce6ddc5909d8b5b8672a01d5324935c75768e5d84a80f26ae0c0fdeee0454704d14184641c395f3a1b",
    "signer": "0xd12A323399559A3773F865c8F21031bc39c29135",
    "userId": "219968466"
  }
}