{
  "manageEntity": {
    "action": "Save",
    "entityId": "351439121",
    "entityType": "Track",
    "nonce": "0xe75e5867d6c3abfc6ec72a26837d18ebb8cfc6dcbc25487f98c4a6cf1c943462",
    "signature": "0x4e2c1a63cae95b74d9b59f8d31986e5f9193f6252477b4f98256d49905c56f074650765cca89e75f2980ba500c8fac5c52bbf38589703cc787de6a5a96687e141c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}