{
  "manageEntity": {
    "action": "Save",
    "entityId": "467615",
    "entityType": "Track",
    "nonce": "0xa72bb20c2c1ee95f7ada88bc218b22927f843fcee1ad896ba79aa36302446781",
    "signature": "0x8481fbcf6c179a0a2aa050df6d60bfc36a0c1256cd3df6b3f3760f02fb0d870a1b486781937ab5773937f9d03ac5dddbd2e53cc6abadf596c36b3657ef6dd4381b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}