{
  "manageEntity": {
    "action": "Save",
    "entityId": "664017428",
    "entityType": "Track",
    "nonce": "0xdadde8a1f7156adade9dc0469d4307fa229d2b32542a7c5e4739f9fd3c49df9d",
    "signature": "0x03522b5dc7340dc34d87f2d522ef9b5f439343ec7928327a06746ed128a515477a4dde8542d8d6ba7ce187786444aa345b7d04eb1203a5c2660ed0176d7c402a1c",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}