{
  "manageEntity": {
    "action": "Save",
    "entityId": "728237",
    "entityType": "Track",
    "nonce": "0xe668382b36f7cef37d13c1b6c2a59392d8baedd6ca7dcf4c2137fcde805095ed",
    "signature": "0x12aa905d92dc1ea5477d3be9401f293d6b089817f1b1f27be72740c09ff1a3984e992e230854e6028352c06c65875b37e18c9b3c39738564d5417226c57bd6741c",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}