{
  "manageEntity": {
    "action": "Save",
    "entityId": "878680927",
    "entityType": "Track",
    "nonce": "0x990445facb9efd3f5836b88815095a2f250eaf51bf6f8dfc500dd0a57960e9fe",
    "signature": "0x634bc62312e8d3b5cd0897d8b8f2dce6935bd4b3f36cf9d2c4a512c93b9251983f56fd5d9615bd398b6f4d5f02f8777f90fc7133dfbbde5c743a33d275a9dffb1b",
    "signer": "0x5E1b23614a9da638dba09e8aB2E9B76ed81c688f",
    "userId": "306948669"
  }
}