{
  "manageEntity": {
    "action": "Save",
    "entityId": "468142064",
    "entityType": "Track",
    "nonce": "0x2f1e3d33ba120d20875645d4e5b4801816ef4453b52f19aa43d2901bceff4961",
    "signature": "0xf88b79c8bf1a7fdf0580a2bb3591f3c0131a006acad207a0ea8af166845bc91b0785d02dc76bbb85a059a15e7eab724bd045afa06956d5340fcb399e9c32b6fd1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}