{
  "manageEntity": {
    "action": "Save",
    "entityId": "728373",
    "entityType": "Track",
    "nonce": "0xb91bccf0b860ae0ec207fffd92d4b840a7e058e3c880cc8eabd4ec3da944d019",
    "signature": "0x14d910f365da52b974832dd5c8588008a38a389f54813d30fcda87aec66e46024dd4b9ccf0cf5467b22d54f4a5fb47c4f6bfdc8933e24d42db9915e80d5417fd1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}