{
  "manageEntity": {
    "action": "Save",
    "entityId": "209736",
    "entityType": "Track",
    "nonce": "0x1b4c568b1e25a136ee19b6211d6519b6725048d713c574e78308b14e4b3bf004",
    "signature": "0xff2e82b94d0c2818d67b0b83e1348cc02da2fbed244ba5af0d5a3d5f8e936e9775b7f0e72c32cfbf51fe3243641b5a2b4dbbf7918a0ad84ed6db4a62ab54281b1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}