{
  "manageEntity": {
    "action": "Save",
    "entityId": "2144362851",
    "entityType": "Track",
    "nonce": "0x5818b0849d9e69e406ef71c586e892d89f016cc0290786406f637176cfa6fbcf",
    "signature": "0x6ebfa36ad1a8ee0849cd5bf475aebf43a63db34a456f59ff1904c4e208d60afc6fceb01d4ac244496d19ee7c48ddeceaf647e5fc69f0103d4b87f3be9bd412741c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}