{
  "manageEntity": {
    "action": "Save",
    "entityId": "1247871363",
    "entityType": "Track",
    "nonce": "0x4d5b8b83c7010644a1b64f638d4af4707ba56cca01d521361e0003a6142b1a28",
    "signature": "0x3d3d063537d9d54d9295efe8ac229dbc134dda7796d9e91c317dcb3849f7338e09c53d7c8de04444e474c06bec67564a791f894fefbead25f186f204d7e6ff361c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}