{
  "manageEntity": {
    "action": "Save",
    "entityId": "1255307796",
    "entityType": "Track",
    "nonce": "0x54dfa60034d46a3e496db818152e5e630d915a765a1e9d9066ef5d41aa191a76",
    "signature": "0xb4de9b003bfbe45acc5ed2595d1546e6bc5139000fa0c4139a269374434554622118a3fe3d73364e65c07192442067409e83ea5dffac286c1569f9afcd2d0a7e1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}