{
  "manageEntity": {
    "action": "Save",
    "entityId": "545573",
    "entityType": "Track",
    "nonce": "0x21f05ce03f9fa08971ca5b4d291dac2b54274a5a2ccc5f4f8f99c1fbf001ef20",
    "signature": "0xab618660b6c35f332caae0dbb6368feb81da3dfa7c92ad6dd29bf6f74051de8540934dbee5c2531e3a331ddb64be91bbcb656941ef81b994bda17b9338b59d8f1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}