{
  "manageEntity": {
    "action": "Save",
    "entityId": "135423381",
    "entityType": "Track",
    "nonce": "0x2f88222fc1d469d1bf30e76ce8d8601bc490a81fc224476a301a19dfaeedffb8",
    "signature": "0x810fc3594211f4bbeb3e93549d5395c2d5e43c05458a79007261d194e1c28e070e728ebbd1410d174571f4e23d7a39ebf6d72aeb6362d1d1c4a691587621bd471c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}