{
  "manageEntity": {
    "action": "Save",
    "entityId": "51912",
    "entityType": "Track",
    "nonce": "0x6e03d8f60c15c97c9718286ed3aae86a3aa9738449e7ed6559753c5a0afac870",
    "signature": "0x201790fc967513003dffe363e0205118fa6eaeb051429993d35143a0488797b40ad31a3dca1f71b7c76e7bbc4941876aebf9e8e97090bbecd5bd318aebc2dda41b",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}