{
  "manageEntity": {
    "action": "Save",
    "entityId": "812744412",
    "entityType": "Track",
    "nonce": "0xf1cf7720427b5d209bd40d7dc76c5614392af854f3d48e0a6488ec4e0b364a4d",
    "signature": "0x37433763affd428c28b59fb6770901366becdf65f8841658d596f51be922cc006c898534f585bcb922bf4cbe2e2ea6186dc5ae03f52bbe0a44add81ae2c598d01b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}