{
  "manageEntity": {
    "action": "Save",
    "entityId": "721226615",
    "entityType": "Track",
    "nonce": "0x21a4895bce779cc92f622c28457d0632d1471f6772813e7714fc65eaabf66f86",
    "signature": "0x43f0c21bb54cd9ed0240de664514ad959540d25fec5ab31e906f869437d38c3559adbd720707d0805201a5ec12a6b4b561e2f39a5818cabc5dffd1aec15271b71c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}