{
  "manageEntity": {
    "action": "Save",
    "entityId": "494045",
    "entityType": "Track",
    "nonce": "0xd3e83c42e630a2526a828e763a2380832e82ffc20c3b59ddea3f8e816526fb51",
    "signature": "0x72ecbcc7b4a87cbd13896bb926471c12cfe8aa1753baa2e5bd828eecfeb61bdc00ca972b37a6e7ba1d94786ad82af8394e3d1182d778d68878987393abb943f01c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}