{
  "manageEntity": {
    "action": "Save",
    "entityId": "469864",
    "entityType": "Track",
    "nonce": "0x11e6d1ec11683d743ac3ea2027501ac919d0425bf34c0ff764c1863264774658",
    "signature": "0xbc3add4dd24b6ed1f834e985ce70432362371f48c4fbb7a2dae2e4b962952d6d5b8241cebb0582dd240d1e18fda1ccd8a545843504ea05c4f57d7572262c8fc61b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}