{
  "manageEntity": {
    "action": "Save",
    "entityId": "1810240155",
    "entityType": "Track",
    "nonce": "0x6a285ffc0b157ddd495927a7c3c52659bec91e39abe1a5055e7efe217aefea5a",
    "signature": "0x88522963a205456a16aff0b0ec81e895560e5f2b72bd3ce24815a9e23c3939bc0a2de79a0eaea54efc40bdba7d52e5a0472e1d6b9ac0e935c66ba2bbaa5ef31a1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}