{
  "manageEntity": {
    "action": "Save",
    "entityId": "1029784",
    "entityType": "Track",
    "nonce": "0x7d5ef877552eadb78e4dff9bdcdcc05637a60079e5eed1c503eb832c46f57ad0",
    "signature": "0x032a64da56506d8b4cff5ddb0f7a6e9591fc47982138e144e3f151442fe3c750627012f1b0121bc329e471941c8a27d8169104d50dfe89a427231803ccc424951c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}