{
  "manageEntity": {
    "action": "Save",
    "entityId": "139081388",
    "entityType": "Track",
    "nonce": "0x4512f8c5cc48c63836a375d4085161cd5902103f5d3f9b9c6b44148f7373f814",
    "signature": "0x0dfb9624b831852b6521fa05af0ac4277414db2e0661264ae0fcf6e275e396094b8158ca46e4b02336aef62ea2384b2ae63595fc371039b9ffadfaed1d1a41e11b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}