{
  "manageEntity": {
    "action": "Save",
    "entityId": "812744412",
    "entityType": "Track",
    "nonce": "0x476d5a62b2126857e32642eb964f54454311b02b7303639e8bbbf931cbe2ef98",
    "signature": "0x59d1ce8b734ea9675eb5472e52eca4ff8d09f94da53dea8db20a0b64259ba0865a5e68599212eff49c1fe3195be4d676c496c13450cededa61036f8b641213261c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}