{
  "manageEntity": {
    "action": "Save",
    "entityId": "540450",
    "entityType": "Track",
    "nonce": "0x87b61bc1d93c1e5bac057d0da66001aaf209f6619f74afce260018e474f4e15e",
    "signature": "0x57f7a530742c076f20125023c772baa55a5ed1d1998f4214ec83c219cea0a4125ba17a36f57ac6f641b0846d6810d694dd109b98f8e0404d2a7a5eca6572fa0e1b",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}