{
  "manageEntity": {
    "action": "Save",
    "entityId": "800341229",
    "entityType": "Track",
    "nonce": "0x589592c2bdffde46ee6c0331b79effd72b28ab90ec6b99073b68ff6de8459036",
    "signature": "0xc7a548ac02ce46a3eae7674562809bcfb4721c1cf62a44920b685dd7cd17304c546043ed65be880023c40c6e66546f6828e921a4bde9db39712f6c42b33363fd1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}