{
  "manageEntity": {
    "action": "Save",
    "entityId": "862859942",
    "entityType": "Track",
    "nonce": "0x7845cd13bf9c6639c13abfb44568c276e06b4874292a2833bb2750acb349a9cd",
    "signature": "0xbb7f1c3e9300a40682de29264f2e023324dcb11cc308ee7661baf4f90e77cafd12c9357d57f25925e46326ce7b9d5462ab97dafbb70cad89b7213824498dde871c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}