{
  "manageEntity": {
    "action": "Save",
    "entityId": "644891",
    "entityType": "Track",
    "nonce": "0x41bc3c3abcc803a7353435a407120f5801b36cac23a5bc5b6a997db7fb92a15b",
    "signature": "0x41ba6f9535be536cbb9f26eacf5d71bb9588db36ba2bce019a0602bc165cf6ed53aad208c0f58b535c2173255db76a8719eda8a5f3b476d0b854fbc60d50d11b1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}