{
  "manageEntity": {
    "action": "Save",
    "entityId": "195370788",
    "entityType": "Track",
    "nonce": "0x4414e690087301e9355e3df5d1f95f998743e5086c2243dd3c9fd0b86122dfdb",
    "signature": "0x58eab3cb7d5956807c6e073f3226db4969701a06c359849f2bab7d2584d22da85d872ff6f2bb85524bc417ed6bff238c5a0b64d2b3f1d86dc250d8e60a6387ba1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}