{
  "manageEntity": {
    "action": "Save",
    "entityId": "551299",
    "entityType": "Track",
    "nonce": "0x1e97c52141b80a5093442078d00deeb1a6eb832bda32a0c98b61fdc24a63f03e",
    "signature": "0xe6d307b7dfaa7fafd44bf97f2472b3659ae30714992d39992fa15f140401eec4126999d51f07141abc97254ff49acb29ca7a36ebdcfd4677f9a75dfc526c037f1b",
    "signer": "0x8159c74A0E0f2188668E1D522276E130dB97B547",
    "userId": "558721253"
  }
}