{
  "manageEntity": {
    "action": "Save",
    "entityId": "747375",
    "entityType": "Track",
    "nonce": "0x2ae931df91fc4f729737f8cf728e8bb3c41eae9b6963187284a30bbe3ecdeb66",
    "signature": "0x2a05240bc0b19ad9c9da01853e0e437bc6ffae0b560bfce7c49bd79b8916ed7b600653dea7d184740162c0075b43c5ef4dd7eeb8b2a8269f92c8aeff09f03fa31c",
    "signer": "0x06Ad5789cE045C5B0AeB97849051a7385CA95B4a",
    "userId": "270209897"
  }
}