{
  "manageEntity": {
    "action": "Save",
    "entityId": "903701251",
    "entityType": "Track",
    "nonce": "0x6d02c6d483e5b8c156c25a568bae93879d79b648602dac274205f0efa24fe4dd",
    "signature": "0xa452afc45083422da0674a207bec83651fe7dedb77914bed90e0a9781095df350ea703691180225d7fde2e22a45b3eeacf4f0de1e281fb094487d5fc0469aa2b1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}