{
  "manageEntity": {
    "action": "Save",
    "entityId": "509868034",
    "entityType": "Track",
    "nonce": "0x335131ab4a6fdac58056c9f232fa755b3c9127ba9362779fc39629d554c1dee8",
    "signature": "0xe02884265f05e51bf13f9fbf8f42bc5e13b8e565bc1e0926ffe57563ec68a8a53cc6317ecf42a78bfe62862a720e21bec03865727f16da567d72deb0424417701b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}