{
  "manageEntity": {
    "action": "Save",
    "entityId": "888524040",
    "entityType": "Track",
    "nonce": "0xc59a63566f4f841d56ad6c3198ffea1948b5d722e8b79b3ac09b7eaf211db1ec",
    "signature": "0xba1e6596760a605d82fb28c5bb1bcb92c3ea4db23e79a9fd3ee8c01ede9b3c111b6c672897d4fd4192e1f1641d05554f35efc784aa1d6b14a1b3f584793dba7a1c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}