{
  "manageEntity": {
    "action": "Save",
    "entityId": "320222",
    "entityType": "Track",
    "nonce": "0xea3095c2648d6ad2e5a9533a0e852ff4da8badb26d66edbb34a7389f51ae5fab",
    "signature": "0xb718984076ef6b50a6f41b08d2e8746351a02224eedebd6024fa1eac79ec4d180eac51c4f2dbfd96647304add11b15059cf513bed6d6fc10be794e2fcad296e21b",
    "signer": "0xCedE64dcD8b0FdEDBdADF4b0ba433797eD6301c9",
    "userId": "638733607"
  }
}