{
  "manageEntity": {
    "action": "Save",
    "entityId": "623283336",
    "entityType": "Track",
    "nonce": "0xa0bbaddf3cc92a91cdb3b4ee9b285dc6bda013c9f271fedd70bf487e7bcec290",
    "signature": "0x90ece7d092e9e7a110f55dfc53ffed7991ec3a79b058b7c237ca64b506568bd7036859b05cf4d19349588e89c0655957abe58b8ece147192a49f941b0fe97a381c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}