{
  "manageEntity": {
    "action": "Save",
    "entityId": "395407",
    "entityType": "Track",
    "nonce": "0x443a617bb74091a3550a7d3dbca360596f545e24ff20ad2e91acd19beac256d4",
    "signature": "0x67a5a67d8d5d0f8cd4eee3bb7af790b3142abfd297c1f11720c29abcfcb12bca18936e79bb1ef8a07bdbc3594d5862496ccf970abbfc5a3803ae13c90591f4531c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}