{
  "manageEntity": {
    "action": "Save",
    "entityId": "1197185194",
    "entityType": "Track",
    "nonce": "0x52a5115ec76c565a166c8638c3958c793c4355fde27e094784231c329ab4d39e",
    "signature": "0x43f22e4765eb5450af0e93f2617eddb4f04f708a689abfed1d50d8d9443575624f123ee43b972664f803c8af75c1c8bf8f12d42f65226700a71f1ee6cb9cf2e21b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}