{
  "manageEntity": {
    "action": "Save",
    "entityId": "854270",
    "entityType": "Track",
    "nonce": "0x9501474d4656840de4d0865228a584e2de3977faa10af45c3e1227ebe3adebbf",
    "signature": "0x148f76131b8f2eac9f109cb2626d81ac5b2d7e83a2043c2a64d8d83596e315c6539aeecbffd45a7eebf17e00bec9e9cadd13819b467a0df24185bdd4d424dd321c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}