{
  "manageEntity": {
    "action": "Save",
    "entityId": "1963400828",
    "entityType": "Track",
    "nonce": "0x85cc6a6798f41042bed8a40a59c8369a91ee87c33ba4c0348ddd9112b2e12580",
    "signature": "0x398b82fc360aa56821b95dfc1cc647063965341feb6b5d962a16ccb6809589d5743eaccf09cd9701e7160fa5a0364de6b718629b67bfb18519fceebc493975cd1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}