{
  "manageEntity": {
    "action": "Save",
    "entityId": "864984833",
    "entityType": "Track",
    "nonce": "0x611117d20da570cc633491d71c2eeca8984158f351d14c63bce8e6ba5069dfc4",
    "signature": "0x869c928a963f7ee7e4fb783cae4137d650b769d6f3385069a25baebea7aacae9701db91c48d7ce0e03f0ffa2348dc18730af847ada7486dc09eea2ca4a7ec5f91b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}