{
  "manageEntity": {
    "action": "Save",
    "entityId": "788030528",
    "entityType": "Track",
    "nonce": "0xa3531db36f5e78c664081878faa54708be54a4b75a08c8b17f952969db6f7da3",
    "signature": "0x5a356c9d2c052733a5f73c028b99c3f8661a51e04cf79d44873f84aa4a47322a5a18c075a2c83bca4391b5c4ad75dda2ef829f9c4b677b6832e8aef13601072e1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}