{
  "manageEntity": {
    "action": "Save",
    "entityId": "561640",
    "entityType": "Track",
    "nonce": "0x27fdb98534e4bdebc22ac4ffe74556b342c421b29e761b4ded3f91b576ba9627",
    "signature": "0x2303b83f0608af058e21e2e034e4aee63950d748abfb42bfa5670af00f9a581210a91d1f24147922fa311c9f4538c843b9a0c42397b7e015f82c7c26af7bcf9b1b",
    "signer": "0xfC070d9d02c152146e3D1B2cD4B03FD7a3CA1AB0",
    "userId": "539537193"
  }
}