{
  "manageEntity": {
    "action": "Save",
    "entityId": "784950483",
    "entityType": "Track",
    "nonce": "0x40ebbe14c9e83b33000f1439c978883d9b875586a9b2f26e4f719075e6b2a42a",
    "signature": "0x64083975551af66d368ac4c38978386275962ba78b3f737fe7c5077794c3caad0a309d6e4b6eeb21698fca20be4722eca5866cb50ebb7dc065092856a36996c21b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}