{
  "manageEntity": {
    "action": "Save",
    "entityId": "399489092",
    "entityType": "Track",
    "nonce": "0xccfad3cf96747e29bb7806e13b039b595c2e4ad4e6b7b9da6e8be864e4e5bca2",
    "signature": "0xfba90cec34461ea2ffbb2b95fcebfbd20939a95b7a0ab540205170a84ca757cf0a97bc1ffefdd004954e983b4447c5cf939f7bb1b2745618edb14c02cfd5f1621c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}