{
  "manageEntity": {
    "action": "Save",
    "entityId": "644673304",
    "entityType": "Track",
    "nonce": "0xc74811253383663cc78d4595f3568bc3292b82c05f2607921ccd7d162389470a",
    "signature": "0x45d37b726c2cd14aa5dd702f079e1cd5912b3c168111d6a265c553ede1bb82dc18c3128b2b5610f14149cd9112bf3101f2c9bd8c1a9f5993489fccdf2005609b1b",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}