{
  "manageEntity": {
    "action": "Save",
    "entityId": "1987689534",
    "entityType": "Track",
    "nonce": "0x58fa72102b34d036499bedf566af61ab63ec0c61b0c7e550846a2657953f472e",
    "signature": "0x6db2bda46dd5f33b3bc514b47569eec6b2847ed7771727614a54e7337c7184850acbecded96abbbf83ffabb5c6d1e6f2e5b95269681bd0da5ffd8992137101b21b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}