{
  "manageEntity": {
    "action": "Save",
    "entityId": "874892",
    "entityType": "Track",
    "nonce": "0xa43b1d3c4e64d7e9a93899c0bab7ea388552b307e89e9675f743917bb6be3517",
    "signature": "0xdc1a7d8e3559e7dcab9d3caa4dbd1da108c56d6128811bb921a2a101fa0d87d717e7a8fa3e4aa2298f77ad7e3eb266352434de139cf18aa1fa4ede01c4a312e81b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}