{
  "manageEntity": {
    "action": "Save",
    "entityId": "337905278",
    "entityType": "Track",
    "nonce": "0x793aa62c2fb97cd6509209c178428f2bf3b7881459b4260e79f68189c7f418af",
    "signature": "0x4151b9e6bdd6413986a2cb5cd57eca6943797cbe7fdf852053ee3c4bb4f3b7330e20a61c5454baef61e15fcecf05a687188895c2e1ff1a81677fcaf2d6ec7f051b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}