{
  "manageEntity": {
    "action": "Save",
    "entityId": "1971683335",
    "entityType": "Track",
    "nonce": "0xe5ffd5358e87b4fd866889c96dd5968a0c989420c57a776636b3409626769c0a",
    "signature": "0xa6f4a41c6b0b6fc1c497014be66b25821b8f1a9b9a7227c9de7bc1fe6349154054ed36bf73f3a5669ab3d7aeb4406171a79c0ebdec7b50395b14de9cfe0a35dc1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}