{
  "manageEntity": {
    "action": "Save",
    "entityId": "413125947",
    "entityType": "Track",
    "nonce": "0x39b86f79ca6373d01c42bd6c02ef5bf7c42254ab3bcaada74cfcb3910fe1efc0",
    "signature": "0x95045936bd0a9caa4e9d4e408369f9d3b4fd68e879955265dd363d48a7a0fde557881b57a51c20bf15e09c954bfd0abd7633b104ecd3b1304de16a3a78d068571c",
    "signer": "0x73e8Bc6E99bCdB967e02101634506Cc9615B88f2",
    "userId": "604047260"
  }
}