{
  "manageEntity": {
    "action": "Save",
    "entityId": "953878",
    "entityType": "Track",
    "nonce": "0xa69666b828d90ebe5029d0adc2e527d7020e3cdd2828574d9a49c66b7bdbfd59",
    "signature": "0xa4e78d3c32188010da32204b285b800ab47a818aef6979a8cb262721c1f3bf71746becab958a6e0439bc24efb90c57540c16854cdca6eab5bf843fe6c9bd6cc81b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}