{
  "manageEntity": {
    "action": "Save",
    "entityId": "400041",
    "entityType": "Track",
    "nonce": "0x761fb69c3aa41f383e83ca5d36306e4fdd4392971fdb15b2e0d9a67dcbd2fc83",
    "signature": "0x29d889529bf7cbf2ac54398cdfbf1ca41399833322cc5f3d6cf050ec08228c875a44206738726108d75f2109f9fffff6d3d78928865887c1469c4d28975dd0511b",
    "signer": "0xa4A8a4853051b18e0f0f777693Ce34CF4bCe9385",
    "userId": "634886384"
  }
}