{
  "manageEntity": {
    "action": "Save",
    "entityId": "438237313",
    "entityType": "Track",
    "nonce": "0x331a0ad64ac53e682875043df460836333091335e01ed0bf9ca0569db0d54902",
    "signature": "0x21be04305e7e9bf183506d3c78690e6c3c28e75e712f3cf794c0223d8c456c7c4bbb5cf9c7208566d3d2baf5bb6711f5c6d0d245ca0b91a06e136e41b933d3ba1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}