{
  "manageEntity": {
    "action": "Save",
    "entityId": "215665909",
    "entityType": "Track",
    "nonce": "0xb48b911087f4e12756b7d67e2d3bb2b7941233b5c2620cfa2167e2f3e72d47a1",
    "signature": "0x218b98cd26601955cf88f15c2e7cf8bac599901cf151d685ef098cf21da8523341113267acb8e5e6e9dff05569ebbf836a84979255b9845b74568df41b0b19471b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}