{
  "manageEntity": {
    "action": "Save",
    "entityId": "1812868384",
    "entityType": "Track",
    "nonce": "0xa797e403c4d341ddea517001b882a18bf77a37d2ea0fc0190bf88dda32c53cf2",
    "signature": "0x219a6e51135fefcfd0efce431df70554ad7e2281bd256aab11cc280b3620a03126ac39928016585c9385cf63a6095c0989c0853d39543d3de78c97c62e9169bf1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}