{
  "manageEntity": {
    "action": "Save",
    "entityId": "142775029",
    "entityType": "Track",
    "nonce": "0xe452e86a37f2f72543c3342d04c6c3a5b754b5a2ba464352dfcbb7a1b699e9cb",
    "signature": "0xbe131333f5404ae0514721bb746969c752122250a664d00a3367a5e3eb6b1c3b1652a2879f770771d7d979cbce2f27a4ea1c10bd226dc08ca74dfc2cb5c3950f1b",
    "signer": "0x67479063A246B10560F7FfC48Dba47268867417B",
    "userId": "745004514"
  }
}