{
  "manageEntity": {
    "action": "Save",
    "entityId": "212896575",
    "entityType": "Track",
    "nonce": "0xa5137dd5d9c9cb3a4ddcfcb90e9b706bb5fefeb774cd24014faefb2e196c74e1",
    "signature": "0x204cd9215bb1660078bd9346ac248c273ef008095e1e88499ea531ca8698822d7612dcc14297277a9c86ea629b71ad48d7d6c55a5fb4c4d795e203193ea258af1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}