{
  "manageEntity": {
    "action": "Save",
    "entityId": "739642280",
    "entityType": "Track",
    "nonce": "0x50c33f89b9ecbce976a53154f7cc1ec6c5758490a1ae00af0fa38f065b3979cf",
    "signature": "0x535a95dc6be8fc67a253e98891175f3a2d02e03ded88d5584d53510e49c7ee0f57c8e7c37ba1ac5d0849c5ad2fe6e1c20dcb3f15f5f6e53e7bf16fdddc8691801c",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}