{
  "manageEntity": {
    "action": "Save",
    "entityId": "29970816",
    "entityType": "Track",
    "nonce": "0x4291e596f2b342da3c9d20c154227a0b66ceee0c301e4b09dcf9f96bebc0cf50",
    "signature": "0x449e4fd0fbe6bb9d4420eb09b9024797c50eee535ce7bbb7167affa73b52f17c4a6be59c60789d64ca654884494603a2caadc44e5c4754b9d4c22dbe6f5a6f6f1b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}