{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900768940",
    "entityType": "Track",
    "nonce": "0x1ee12bdae2f6277710c356b9354c8d71faee5dc8229bd395956a9ae1377fcc07",
    "signature": "0xf260ea8a765d7b21a7cedfd92dd30734b505f30cf24075e03c38c6d037426d5a705be2d61437c62f03e2a895d1fc2f9cc66527ad6233458822ae4922021eb4621b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}