{
  "manageEntity": {
    "action": "Save",
    "entityId": "1289458664",
    "entityType": "Track",
    "nonce": "0xf1b399c89386a33dbaa04ddd0d77a12d003a3bc97ee352f20d8208b48602c12a",
    "signature": "0xd77a1e8fdfe90bbc5c114db9961bcca3748528bb0f02c9c1d028ba9490f441bd058e6a75947655d8bc8500dd33dd8fc7fdaae1b2671c934aff78ee50cd7c89271c",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}