{
  "manageEntity": {
    "action": "Save",
    "entityId": "349292695",
    "entityType": "Track",
    "nonce": "0x6697bfd086d96ecf2617e9f9df655742d6a384a37166e22e2becad1ac8d1a893",
    "signature": "0xb947f2a34ede997489739d0b4b3222c52018439d93d52b586208cd2a72d2cc105ffd551d642bd8a164efc177cdc22b3fa387372de5ebf4a98e101535eded50d01b",
    "signer": "0x738Fb353b57EdB4d1f33c0049D33b204243db2ad",
    "userId": "693463302"
  }
}