{
  "manageEntity": {
    "action": "Save",
    "entityId": "456818688",
    "entityType": "Track",
    "nonce": "0x2b4a2e599b1ba674ea2f3fe019fef91928f936cf0cc64baf2da0685982dd21fd",
    "signature": "0xac7359283c1fa18d568a0d3a7ba9c6bbf47b037a43e509453b7c06de7ea65cf6143dcec70c476b4745fb63e908618c4b89e34a5c747cd6eed22836ab9c73b4ca1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}