{
  "manageEntity": {
    "action": "Save",
    "entityId": "673434",
    "entityType": "Track",
    "nonce": "0x01c36281db63d93957e6abec653cad582f7e20208a2cdf2ea470580da53e6b88",
    "signature": "0x9527751a76fc202a2111889ccecf0a024b1ea67945c5d547023065ed2f2cf7987c1366f6378f429380e61a73640e5fee59ae850308f438edc1a352ca453eda121c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}