{
  "manageEntity": {
    "action": "Save",
    "entityId": "308768148",
    "entityType": "Track",
    "nonce": "0x3c3121267d4b405047b95252b44341340724361af35c16a12bf02f54a199da05",
    "signature": "0xd0c829dd0314f554f8e1e2513f4c7016037345ec1bbcadafde5edc9a61a4689a76582f9489c30cf1ee53c3a54b1dd015129f681989eda9608d1100c02a24cfe91b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}