{
  "manageEntity": {
    "action": "Save",
    "entityId": "303074",
    "entityType": "Track",
    "nonce": "0xaa4c91ccdbcfe2b698a172691495326ca96d8bd38335a5686db0bd2bfc9b271a",
    "signature": "0x70e42962173f58c45780fd5339f94244201f9bcbf54552527bb328b84e3e8d060408a6de9ad3590f307b078951164a6fcf37b8235ed232d8b87a41dcd743e7e61c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}