{
  "manageEntity": {
    "action": "Save",
    "entityId": "1581218880",
    "entityType": "Track",
    "nonce": "0x9d8dd976abaa027da0390036bbb212d8648c2c1dec0073c4b653e9189a3b484d",
    "signature": "0x9397b8037f126af3e457627cdb208acd9a1bf3925ca9811628d9db75b69fa97d17b7d98440ed07f61bf0316c526f597688fcc255f9b33f7b3503925318a03f671c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}