{
  "manageEntity": {
    "action": "Save",
    "entityId": "618377994",
    "entityType": "Track",
    "nonce": "0x5ba728ffa19cbc174594ebad2d6e3e4b5491c0094261998abcd7f5d7d9974855",
    "signature": "0x7fe0f19e548d4d7126f33c468c5e8c38c0377215f08275590201e7dec0ccbbef01f01c2b4d3f9373d92c192a042f0a393c1662676e36387f03067cde011098981c",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}