{
  "manageEntity": {
    "action": "Save",
    "entityId": "768359431",
    "entityType": "Track",
    "nonce": "1792320947904498605",
    "signature": "0xec0ce8aac908b5f10c1884be509e4f04ea9cfcd1c31519826a1bf9b1d854d226231d87b4c8c00087f013d8c658a9de3e09b593f55efbf371c8b86a4264e7b9441c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}