{
  "manageEntity": {
    "action": "Save",
    "entityId": "144076385",
    "entityType": "Track",
    "nonce": "0x8e9fb9b3c5dd205cac2e74cdbd27862047e55877b92c9ad570a61a286b012c0f",
    "signature": "0xf31c9d140e0b901b4071cc90eb442fb4dbd4eb0e6e6eda9c3cbf44c1c3b2bc701df79ac2016ce43d002eeeb5d6ea4018d35013ebd59c8f86e12328200d68e2651c",
    "signer": "0x796D60E9fE921C82Ef20f6329e27dD246392f542",
    "userId": "809803"
  }
}