{
  "manageEntity": {
    "action": "Save",
    "entityId": "1215577355",
    "entityType": "Track",
    "nonce": "0x63d0928e58d81186635cd8e0aadc6941d4124f61bc73bb23ed50c599d56ffa10",
    "signature": "0x5e60a5e741fc48f0c71f24d5383ce93d524ba0db1bd02848e10813615e9062fb27fd8b898c5e118f2d1955e8a1f040dd297ea2f27eb724244893749decd5ab5a1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}