{
  "manageEntity": {
    "action": "Save",
    "entityId": "396499",
    "entityType": "Track",
    "nonce": "0x04d449f0b6e0a1146531a79411dea4120a66a11e8e500082855a2160f614eb79",
    "signature": "0xf3f5c61cc380ea625065b12f960fcb60cdea85e8f4ebdbdb9eb859e728141aaf37f1ea86431774cac903b3fb86014cff662161a587d331e5dbbc49bfa54b1fc81b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}