{
  "manageEntity": {
    "action": "Save",
    "entityId": "569004747",
    "entityType": "Track",
    "nonce": "0x95cba362da00ae1bdf26dd97b4e790c3d54bc97bda135b27e087d608b5ce76a0",
    "signature": "0x4080a4ce268d0cb4ebd41c60c4f7b014e5b02e67bd98c697a87374ea36ac35e949d36151a935d4a63ef2be02ddd3e6efa0242790257d1dbf691d674d7adc12ae1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}