{
  "manageEntity": {
    "action": "Save",
    "entityId": "548157560",
    "entityType": "Track",
    "nonce": "0xe440a166b0d7dbbf14042d0552bde84e2330aca45dc5733773f75da474b693a0",
    "signature": "0x4a0872516a1d510030536e8201b925067b752cac113e74cfefcab801d918b2cf657bd1b0bef9aab201cebfec9d45782433dde86e22b133413900c409b60a89621c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}