{
  "manageEntity": {
    "action": "Save",
    "entityId": "1433298568",
    "entityType": "Track",
    "nonce": "0xbff48d735c805ba6d004d4e3045d166a629b03cd6744257ad1add56e1a37dccd",
    "signature": "0x8846ff65c6c0fb2762c8d4dabaa780ca435061a8dd75a4e442f5560fe2468e1e366d7e8d5e629d51d5cdbfc0a054cf48b35ad085ea3cbda8c96e26dbd57962991c",
    "signer": "0xa185Ff45de6FF68eAa1d7ceC338cba250810134c",
    "userId": "54166466"
  }
}