{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900240083",
    "entityType": "Track",
    "nonce": "0xd9e3b8c279e379e2d9a19e19c52533f04b8470ade0bae54ffbb7e50c4b9187af",
    "signature": "0x57c875190256ae81c41d9586e6b0b5325227f78c6d24b5cd861ccdd44691267725b9d1c2551d0e846ceb3c81bdbf5cf68dc6ef679c0f22c386070049f87d71c01c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}