{
  "manageEntity": {
    "action": "Save",
    "entityId": "263898325",
    "entityType": "Track",
    "nonce": "0x662c68dd3a2a72bb72ce851634b3ca5187975b59e4bfaf075299cb768cb1eeb2",
    "signature": "0x8aaa20e28c1aadbff97a79a75339f9cbe843b80dfcb9745a0d2eab539cce17f37c6223054e37c7fbcefabbc514f5cb80e63a847ceae6e0d1caadcff3bd9a26d01b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}