{
  "manageEntity": {
    "action": "Save",
    "entityId": "973131",
    "entityType": "Track",
    "nonce": "0x1187be69efe3f68c77e9fbebd7dcbf87ff1acb10bae4c61141484a563c4d5e00",
    "signature": "0xebc0fcd53ca9fe421d03c888bfeaed4d19fe113b4d5ac5d25e24b247e2a5ed48393a1cfb1fb74a042c3fc58792c975f6f1768790a38896b969cdea8c9150354e1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}