{
  "manageEntity": {
    "action": "Save",
    "entityId": "868578434",
    "entityType": "Track",
    "nonce": "0x1856872a7a4cc62fdcb224da1d91bf6dd8e079f1f5360f1147c27ec76e3da898",
    "signature": "0x9c09f6bb0cc4470a3c85ebfe7d68165c94a4340296c2af07f13f6219a0ccc85a6b276b125eb5aa570819a1075dcc07d279e97405eb745d612153067be1a216aa1b",
    "signer": "0xf291C7EF7f0222b0B99c04FF44cd879b045769C4",
    "userId": "37757905"
  }
}