{
  "manageEntity": {
    "action": "Save",
    "entityId": "820494831",
    "entityType": "Track",
    "nonce": "0x19a6b1e37ff94f9825b10a69c70c7a1896f0e14bf79c6bb5552d78c77f01355e",
    "signature": "0xaa259c801599401aa2afd60a32553b4b8ee76abed1c75a80791bf677e18ded0c13097305e8fffc7c31294fe565d0f2a44817fb41f132d703844d1b0714af0df21c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}