{
  "manageEntity": {
    "action": "Save",
    "entityId": "891220628",
    "entityType": "Track",
    "nonce": "0x876233465a69c446f52b6a49f3edab1db7672be9ded48c4708a2743b5d92f517",
    "signature": "0x1a6dfaa7a4d993d9a703dc13e8b3bc3997ee9f67f6c35b28701b42d4a49722d84efeced7136776f9bb74883854eea1976f82fbc56e064b2d6569b7475c82c4471b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}