{
  "manageEntity": {
    "action": "Save",
    "entityId": "321125425",
    "entityType": "Track",
    "nonce": "0xbcd3bb6367f972573d073570bdbe5651ecd11313ea810bf3a1a1f0e053b8891c",
    "signature": "0x317170a17b7990e148b77f551ae4d7982bb02293e8317567c2260168c305e1c7314b6a2919a365e3dee65dd5fbbc897e93ccb5a02eacedd84c6d00c869b2b87f1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}