{
  "manageEntity": {
    "action": "Save",
    "entityId": "538729427",
    "entityType": "Track",
    "nonce": "0x1cbdd25adec4f8eba9839acc7ac90ba7da6c3c7b16e84676569dec8faf64250d",
    "signature": "0xfd84346395d4d16de0651e9d2f0295834b2cfc06e8a15c0e131b1cd594156e2d14ce06629f5ebc22242e2800dd354c5a3fddb15d403921405e6acfa4c71742b51c",
    "signer": "0x44Fe9338D9d1405927C73FDA0be0F36ae481Cd39",
    "userId": "983568397"
  }
}