{
  "manageEntity": {
    "action": "Save",
    "entityId": "214555",
    "entityType": "Track",
    "nonce": "0x374e70d2f17db65aac606025c33a88b0293d07f54bd5b1101efb71f1ca493361",
    "signature": "0x951cbf8a9c5ea745334366801e580a21063288e5284cf7a98cf0f4fc6f1293b203f4ee683db325778757280c27f9bc1bf30c141030d8b196cff9c21c354ff9e01c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}