{
  "manageEntity": {
    "action": "Save",
    "entityId": "1987827540",
    "entityType": "Track",
    "nonce": "0x10402d73ae928b6a491668ea84d9826fb4e7b8c5513630b35bf800ea8c741839",
    "signature": "0xe9e07040d0a308a14606f6f57ca6d77d8ace58639fa9fea59975182a4359198d1c88afdd9d6d64c49e9a3b26b9d0aaf38e5ee58954aadd8654026fd2eac4e4d51b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}