{
  "manageEntity": {
    "action": "Save",
    "entityId": "758330642",
    "entityType": "Track",
    "nonce": "0xf08bfaf9338fd0a38c29639f9a9d61c62773a308242255590af442504e683ffc",
    "signature": "0x777733d4a870102854bb2fbdb01c1cadd8b5ebe2cfdb06ca076d0600aec5d6b64e8f4fa010939b0f5208fb835f85fa9a870a98541f724272a46b6f56cfff58531c",
    "signer": "0xE7CBFEc5b376a30FC2f4ec7F7817de7946725b29",
    "userId": "915456723"
  }
}