{
  "manageEntity": {
    "action": "Save",
    "entityId": "481364807",
    "entityType": "Track",
    "nonce": "0xf55c2c4ef9cdb28064c76f7abb892e4d0a1da5e179356e8b3fce76cdb9d9fb00",
    "signature": "0x560cf877becd36298977a600796b311b145ded207ae53cfcfe021c631e16b75766fc47c231c190c917688c5a43b728119f7ee4ee1fedd873f93d438e3d629d921b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}