{
  "manageEntity": {
    "action": "Save",
    "entityId": "193352146",
    "entityType": "Track",
    "nonce": "0xe0461db505cc9b5de8f27d4261ab2f4c5187c7b426e5bb0a3fc2cbcf9afc6e21",
    "signature": "0x120a9684293035b878fc9c19ec38a301993c7155f93e02b52bb5e25f819f762e7f19e526fa7c64cbc8f4fb4ccfb75bfd3d38e5de443940cb7887c722e35689151b",
    "signer": "0xB755CddA6da08Cbad290b9528CD0dC860f9f7dd5",
    "userId": "536791428"
  }
}