{
  "manageEntity": {
    "action": "Save",
    "entityId": "609246",
    "entityType": "Track",
    "nonce": "0x0e47a999fcc5d8baea69c92ac3e3facf665790f1270ebed6be59580dc30c3f22",
    "signature": "0x42a40fdc918f81abe918cbf8121bacead9fed91621204892b056676f5feca275191c414544bd49469a18b973e6dfbf6428f188f5c10ac1bde29ee9bbc74da8341c",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}