{
  "manageEntity": {
    "action": "Save",
    "entityId": "1029452687",
    "entityType": "Track",
    "nonce": "1787418858961004753",
    "signature": "0xb248d1b6cc034fa4c10dcd018995181dbade1195917c7b76c8d726b4f36d6db40a63d454fbc84b3dfd892e7d5d37fd611dba95666fd0ee83ec2ce80fdf6ed3b01b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}