{
  "manageEntity": {
    "action": "Save",
    "entityId": "604564070",
    "entityType": "Track",
    "nonce": "0x5439fb45da62f04fa878cf3d7a7cd0d0eca17a06d67f8ae221078e904e680e48",
    "signature": "0x9da989e05875af94a23e506ddbabf7206928d8179b8588d17eadfccb9e9926b21a36b2147f874cdbb01241501c74ee6165c29789316e896ee705da79005484251b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}