{
  "manageEntity": {
    "action": "Save",
    "entityId": "546948681",
    "entityType": "Track",
    "nonce": "0x6169f90efc83f37a090c53388e3337da348bc02064c9a5d97b50633f5325022b",
    "signature": "0x30a67d0a14ab60222d0ae1c6a6129d6c9a4a317a8fc8443ed3ef89e23f5a0e6f66455c09fcc47c6664c6d058f510f8faf8035209bac844e63f6fe80d60ef768b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}