{
  "manageEntity": {
    "action": "Save",
    "entityId": "947915455",
    "entityType": "Track",
    "nonce": "0x355b63cdd79e1cf7d86619162160ae9a6df03f7edbacd73c9cc500030caa5d28",
    "signature": "0x98bea8f64703ab00ca60b564b783af0f7a9c4faf48f9a0a9014c07f1c8ce830a2dcc41543544714e8835d2d6ebaa32c7e7a0a9aa3f7b0b41a0f7a1a0b80ff7b81b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}