{
  "manageEntity": {
    "action": "Save",
    "entityId": "374676646",
    "entityType": "Track",
    "nonce": "0xb6bb7bad4c6e5409ddb014ddeb4a38ea810b6dad0f8ef31984a317509c7c13cf",
    "signature": "0xec23d85b44286e64ec622443f6a96aeaf9e81376096223a13524c92ce7514e266ae5b7c0ba0a0f7a049ca87d91f1c6b8300d054cde1f37258ee6639895bbd4901b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}