{
  "manageEntity": {
    "action": "Save",
    "entityId": "899291",
    "entityType": "Track",
    "nonce": "0xa1b6e5a13af5b2ca46d97450cc49c4f052d12a94b6eb7a8112b63c484b59aeaa",
    "signature": "0x30ecb52acb7f0b1a7fc4856e51b9664cbd1ad0117ebfc7485f545f0c5940a4ca2a674b9f006d48579c1e93422cf90fba9cfd55225217449fde6d26240beb6c311c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}