{
  "manageEntity": {
    "action": "Save",
    "entityId": "398412",
    "entityType": "Track",
    "nonce": "0x0365239f1200420d67692be1b44c2a41127c9d8004ea9657ecee9331e1fe9d6d",
    "signature": "0x634414a66db974c645d11495ac1bdc21712829331e34521348f615b7711ca7aa13d84dee7ae758c8e401793983cc3839f971512c81d6b65f65a3860a4a0c25331b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}