{
  "manageEntity": {
    "action": "Save",
    "entityId": "249545895",
    "entityType": "Track",
    "nonce": "0xf5116179a7b2f9bae8da43be2c4dc87f0c8fc96a10a0c81d4ecd91b897f7e75f",
    "signature": "0x53ea5d257631a9a7854446c461d4bbab2d4f8bcd5dd73d9962b2c1f1d0497d3757c01ac46cee24813373d2e7b021a742725b22142e48b77de348a5e25dfdf2181c",
    "signer": "0x796D60E9fE921C82Ef20f6329e27dD246392f542",
    "userId": "809803"
  }
}