{
  "manageEntity": {
    "action": "Save",
    "entityId": "599178557",
    "entityType": "Track",
    "nonce": "0x2afe3a9a05ba4771143a5174fc40690639e5131395a082c201e6ee8c9a85166d",
    "signature": "0x0f57696314b48e69e2f0da36e35435234cb90cfbbb483f5c9eee2fcdd4cdd4ab6a56219ff79c7fbb6604214dcb4f4d6f4f19ce5932206f1294290e85c145410a1c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}