{
  "manageEntity": {
    "action": "Save",
    "entityId": "525138",
    "entityType": "Track",
    "nonce": "0x0d37158b993688acbda078bfc7a57a90fd12cc6d021df0e41a6947cef8c4e537",
    "signature": "0xc7e9c8a4918d8e01c927567edb171cecff3b4878ea04d4932c9bff72f0c4b6bb0747f86fb0c837759301be53398b4f27f2e5f2b0ee9904f6667eb6939e21c7221b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}