{
  "manageEntity": {
    "action": "Save",
    "entityId": "576569",
    "entityType": "Track",
    "nonce": "0x03c3d7a4aa4305b6260d81ca76ac86a50e295970d0dc0a35e92706a6f39a3745",
    "signature": "0x45ef6f93d7d3df3ea4a52d3f0dfbf7e18618e9aab567bbbc09f215af5d250cfa3d0b68d65c19fcc58533e1a08c7c043cc26bf428be6f519d5123ed24e1ec0f601c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}