{
  "manageEntity": {
    "action": "Save",
    "entityId": "878499597",
    "entityType": "Track",
    "nonce": "0xffa009e018d56d332c527071184bc5bb7e82b72be7b5caabc5f9a2df5b0c96ab",
    "signature": "0x31f0d76b809627f3de4aba07cb812e0f621f0a10123d2848c3583114d96fae01665e813d4f0fd4c1f4e24afa8ae550b056a6637ae1e66d4df49076b50a3ec4c71b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}