{
  "manageEntity": {
    "action": "Save",
    "entityId": "598763726",
    "entityType": "Track",
    "nonce": "0x90cb3f3a396a7843337457396403fbe40947b6c3659ddc3700da7132307322bf",
    "signature": "0x7665baac6dceac53e09d392e37d3b65ad2556fce79ede0596a0f4988606e93271f4a90e019f5f0dc21999f4529ced6c6e9be6cbc49fa00143a615687e2744b1f1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}