{
  "manageEntity": {
    "action": "Save",
    "entityId": "298144",
    "entityType": "Track",
    "nonce": "0xb91452833ec3bfa7746f4118cf735d00d7a95f3aca5b95e1cb9d811f1848c15c",
    "signature": "0x7fc38aa1c5e6827c9e75f1a968a7c894360b0f34b04d86f677200fb9fac8ed7648579b87dfb7442c255f7372d6b3e8de0e94c8b9745de4db61bc75871a46ba531c",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}